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1

SLAC linear collider  

SciTech Connect (OSTI)

A brief description of the proposed SLAC Linear Collider is given. This machine would investigate the possibilities and limitations of Linear Colliders while at the same time producing thousands of Z/sup 0/ particles per day for the study of the weak interactions.

Hollebeek, R.

1980-06-01T23:59:59.000Z

2

[New technology for linear colliders  

SciTech Connect (OSTI)

This report discusses the following topics on research of microwave amplifiers for linear colliders: Context in current microwave technology development; gated field emission for microwave cathodes; cathode fabrication and tests; microwave cathode design using field emitters; and microwave localization.

McIntyre, P.M.

1992-08-12T23:59:59.000Z

3

Linear Collider Collaboration Tech Notes  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

6, 27/05/99 6, 27/05/99 Tolerances of Random RF Jitters in X-Band Main Linacs May 27, 1999 Kiyoshi KUBO KEK Tsukuba, Japan Abstract: Tracking simulations have been performed for the main linacs of an X-band linear collider. We discuss the choice of phase of the accelerating field relative to the bunches. The tolerances of the phase and the amplitude errors are studied. Tolerances of Random RF Jitters in X-Band Main Linacs K. Kubo, KEK Abstract Tracking simulations have been performed for main linacs of X-band linear collider. We discuss about choice of the phase of the accelerating field relative to the bunches. The tolerances of the phase and the amplitude errors are studied. 1 INTRODUCTION In order to preserve the low emittance through the main linacs of future linear colliders, various effects

4

Challenges in future linear colliders  

SciTech Connect (OSTI)

For decades, electron-positron colliders have been complementing proton-proton colliders. But the circular LEP, the largest e-e+ collider, represented an energy limit beyond which energy losses to synchrotron radiation necessitate moving to e-e+ linear colliders (LCs), thereby raising new challenges for accelerator builders. Japanese-American, German, and European collaborations have presented options for the Future Linear Collider (FLC). Key accelerator issues for any FLC option are the achievement of high enough energy and luminosity. Damping rings, taking advantage of the phenomenon of synchrotron radiation, have been developed as the means for decreasing beam size, which is crucial for ensuring a sufficiently high rate of particle-particle collisions. Related challenges are alignment and stability in an environment where even minute ground motion can disrupt performance, and the ability to monitor beam size. The technical challenges exist within a wider context of socioeconomic and political challenges, likely necessitating continued development of international collaboration among parties involved in accelerator-based physics.

Swapan Chattopadhyay; Kaoru Yokoya

2002-09-02T23:59:59.000Z

5

The Next Linear Collider Program  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

To use the left side navigation on this page, you will need to turn on To use the left side navigation on this page, you will need to turn on Javascript. You do not need JavaScript to use the text-based navigation bar at the bottom of the page. The Next Linear Collider at SLAC Navbar MISSION: Scientists expect research at this facility to answer fundamental questions about the behavior of matter and the origins of the Universe. NLC 8-Pack on the Drawing Board What's New In the Next Linear Collider: • NLC Newsletter October, 2001 • NLC Snowmass report 2001 • NLC All Hands Talk, August 2001 Upcoming Events: • Fall 2001 Working Sessions, Oct. 22-23, 2001 • Pulse Compression Workshop, Oct. 22-24, 2001 • Machine Advisory Committee Mtg., Oct. 24-26, 2001 • ISG-7 at KEK, Nov. 12-15, 2001 • LC' 02 at SLAC, Feb. 4-8, 2002 NLC Website Search: Entire SLAC Web | Help |

6

International Workshop on Linear Colliders 2010  

ScienceCinema (OSTI)

IWLC2010 International Workshop on Linear Colliders 2010ECFA-CLIC-ILC joint meeting: Monday 18 October - Friday 22 October 2010Venue: CERN and CICG (International Conference Centre Geneva, Switzerland)This year, the International Workshop on Linear Colliders organized by the European Committee for Future Accelerators (ECFA) will study the physics, detectors and accelerator complex of a linear collider covering both CLIC and ILC options.Contact Workshop SecretariatIWLC2010 is hostedby CERN

None

2011-10-06T23:59:59.000Z

7

Subcritical Fission Reactor Based on Linear Collider  

E-Print Network [OSTI]

The beams of Linear Collider after main collision can be utilized to build an accelerator--driven sub--critical reactor.

I. F. Ginzburg

2005-07-29T23:59:59.000Z

8

Linear Collider Collaboration Tech Notes  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

NLC Home Page NLC Technical SLAC The LCC Tech Note series was started in July 1998 to document the JLC/NLC collaborative design effort. The notes are numbered sequentially and may also be given a SLAC, FNAL, LBNL, LLNL and/or KEK publication number. The LCC notes will be distributed through the Web in electronic form as PDF files -- the authors are responsible for keeping the original documents. Other document series are the NLC Notes that were started for the SLAC ZDR, the KEK ATF Notes, and at some future time there should be a series of Technical (NLD) Notes to document work on detector studies for the next-generation linear collider. LCC-0001 "Memorandum of Understanding between KEK and SLAC," 2/98. LCC-0002 "Transparencies and Summaries from the 1st ISG meeting: January 1998," G. Loew, ed., 2/98.

9

Linear Collider Collaboration Tech Notes LCC-0108  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

8 8 TESLA 2002-10 CBP Tech Note-268 November 2002 Comparison of Emittance Tuning Simulations in the NLC and TESLA Damping Rings Andrej Wolski Lawrence Berkeley National Laboratory University of California Berkeley, CA Winfried Decking Deutsches Elektron Synchrotron (DESY) Hamburg, Germany Abstract: Vertical emittance is a critical issue for future linear collider damping rings. Both NLC and TESLA specify vertical emittance of the order of a few picometers, below values currently achieved in any storage ring. Simulations show that algorithms based on correcting the closed orbit and the vertical dispersion can be effective in reducing the vertical emittance to the required levels, in the presence of a limited subset of

10

Linear Collider Collaboration Tech Notes LCC-0100  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

100 100 August 2002 Systematic Ground Motion and Macroalignment for Linear Colliders Rainer Pitthan Stanford Linear Accelerator Center Stanford University Stanford, CA 94309, USA Abstract: Future colliders with their µm-range operational tolerances still need to be classically aligned to the 50 - 100 µm range, and kept there, over the km range. This requirement will not be a show-stopper, but not be trivial either. 50 µm movements over a betatron wavelength is a the range where systematic long term motions can prevent efficient operation. Systematic Ground Motion and Macro-Alignment for Linear Colliders Complete talk at: http://www-project.slac.stanford.edu/lc/wkshp/snowmass2001/t6/info/pitthan july

11

The Next Linear Collider: NLC2001  

SciTech Connect (OSTI)

Recent studies in elementary particle physics have made the need for an e{sup +}e{sup -} linear collider able to reach energies of 500 GeV and above with high luminosity more compelling than ever [1]. Observations and measurements completed in the last five years at the SLC (SLAC), LEP (CERN), and the Tevatron (FNAL) can be explained only by the existence of at least one particle or interaction that has not yet been directly observed in experiment. The Higgs boson of the Standard Model could be that particle. The data point strongly to a mass for the Higgs boson that is just beyond the reach of existing colliders. This brings great urgency and excitement to the potential for discovery at the upgraded Tevatron early in this decade, and almost assures that later experiments at the LHC will find new physics. But the next generation of experiments to be mounted by the world-wide particle physics community must not only find this new physics, they must find out what it is. These experiments must also define the next important threshold in energy. The need is to understand physics at the TeV energy scale as well as the physics at the 100-GeV energy scale is now understood. This will require both the LHC and a companion linear electron-positron collider. A first Zeroth-Order Design Report (ZDR) [2] for a second-generation electron-positron linear collider, the Next Linear Collider (NLC), was published five years ago. The NLC design is based on a high-frequency room-temperature rf accelerator. Its goal is exploration of elementary particle physics at the TeV center-of-mass energy, while learning how to design and build colliders at still higher energies. Many advances in accelerator technologies and improvements in the design of the NLC have been made since 1996. This Report is a brief update of the ZDR.

D. Burke et al.

2002-01-14T23:59:59.000Z

12

Linear Collider Collaboration Tech Notes  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

Notes Notes LCC - 0018, 15/06/99 Rev B, June 2002 Correct Account of RF Deflections in Linac Acceleration June 15, 1999 G.V. Stupakov Stanford Linear Accelerator Center Stanford, California Abstract: During acceleration in the linac structure, the beam not only increases its longitudinal momentum, but also experiences a transverse kick from the accelerating mode which is linear in accelerating gradient. This effect is neglected in such computer codes as LIAR and TRANSPORT. We derived the Hamiltonian equations that describe the effect of RF deflection into the acceleration process and included it into the computational engine of LIAR. By comparing orbits for the NLC main linac, we found that the difference between the two algorithms is about 10\%. The effect will be more pronounced at smaller

13

Towards a Future Linear Collider and The Linear Collider Studies at CERN  

ScienceCinema (OSTI)

During the week 18-22 October, more than 400 physicists will meet at CERN and in the CICG (International Conference Centre Geneva) to review the global progress towards a future linear collider. The 2010 International Workshop on Linear Colliders will study the physics, detectors and accelerator complex of a linear collider covering both the CLIC and ILC options. Among the topics presented and discussed will be the progress towards the CLIC Conceptual Design Report in 2011, the ILC Technical Design Report in 2012, physics and detector studies linked to these reports, and an increasing numbers of common working group activities. The seminar will give an overview of these topics and also CERN?s linear collider studies, focusing on current activities and initial plans for the period 2011-16. n.b: The Council Chamber is also reserved for this colloquium with a live transmission from the Main Auditorium.

None

2011-10-06T23:59:59.000Z

14

Linear Collider Collaboration Tech Notes  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

1 1 May 2001 Lattice Description for NLC Damping Rings at 120 Hz Andrzej Wolski Lawrence Berkeley National Laboratory Abstract: We present a lattice design for the NLC Main Damping Rings at 120 Hz repe tition rate. A total wiggler length of a little over 46 m is needed to achieve the damping time required for extracted, normalized, vertical emittance below 0.02 mm mrad. The dynamic aperture (using a linear model for the wiggler) is in excess of 15 times the injected beam size. The principal lattice parameters and characteristics are presented in this note; we also outline results of studies of alignment and field quality tolerances. CBP Tech Note-227 LCC-0061 Lattice Description for NLC Main Damping Rings at 120 Hz Andrzej Wolski Lawrence Berkeley National Laboratory

15

Linear Collider Collaboration Tech Notes  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

0 0 April 2001 Rev.1 July 2003 Guide to LIBXSIF, a Library for Parsing the Extended Standard Input Format of Accelerated Beamlines Peter G. Tenenbaum Stanford Linear Accelerator Center Stanford University Stanford, CA Abstract: We describe LIBXSIF, a standalone library for parsing the Extended Standard Input Format of accelerator beamlines. Included in the description are: documentation of user commands; full description of permitted accelerator elements and their attributes; the construction of beamline lists; the mechanics of adding LIBXSIF to an existing program; and "under the hood" details for users who wish to modify the library or are merely morbidly curious. Guide to LIBXSIF, a Library for Parsing the Extended Standard Input Format of

16

Linear Collider Collaboration Tech Notes  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

5 08//00 5 08//00 Study of Beam Energy Spectrum Measurement in the NLC Extraction Line August 2000 Yuri Nosochkov and Tor Raubenheimer Stanford Linear Accelerator Center Stanford, CA Abstract: The NLC extraction line optics includes a secondary focal point with a very small _- function and 2 cm dispersion which can be used for measurement of outgoing beam energy spread. In this study, we performed tracking simulations to transport the NLC disrupted beam from the Interaction Point (IP) to the extraction line secondary focus (the IP image), `measure' the transverse beam pro_le at the IP image and reconstruct the beam energy spectrum. The resultant distribution was compared with the original energy spectrum at the IP. Study of Beam Energy Spectrum Measurement

17

Linear Collider Collaboration Tech Notes  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

2 03/12/99 2 03/12/99 PEP-II RF Cavity Revisited December 3, 1999 R. Rimmer, G. Koehler, D. Li, N. Hartmann, N. Folwell, J. Hodgson, B. McCandless Lawrence Berkeley National Laboratory Stanford Linear Accelerator Center Berkeley, CA, USA Stanford, CA, USA Abstract: This report describes the results of numerical simulations of the PEP-II RF cavity performed after the completion of the construction phase of the project and comparisons are made to previous calculations and measured results. These analyses were performed to evaluate new calculation techniques for the HOM distribution and RF surface heating that were not available at the time of the original design. These include the use of a high frequency electromagnetic element in ANSYS and the new Omega 3P code to study wall

18

Linear Collider Collaboration Tech Notes  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

4, 10/03/00 4, 10/03/00 Luminosity for NLC Design Variations March 10, 1999 K.A. Thompson and T.O. Raubenheimer Stanford Linear Accelerator Center Stanford, CA, USA Abstract: In this note we give Guineapig simulation results for the luminosity and luminosity spectrum of three baseline NLC designs at 0.5~TeV and 1.0~TeV and compare the simulation results with analytic approximations. We examine the effects of varying several design parameters away from the NLC-B-500 and NLC-B-1000 designs, in order to study possible trade-offs of parameters that could ease tolerances, increase luminosity, or help to optimize machine operation for specific physics processes. Luminosity for NLC Design Variations K.A. Thompson and T.O.Raubenheimer INTRODUCTION In this note we give Guineapig [l] simulation results for the luminosity and

19

Linear Collider Collaboration Tech Notes  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

Notes Notes LCC - 0038 29/04/00 CBP Tech Note - 234 Transverse Field Profile of the NLC Damping Rings Electromagnet Wiggler 29 April 2000 17 J. Corlett and S. Marks Lawrence Berkeley National Laboratory M. C. Ross Stanford Linear Accelerator Center Stanford, CA Abstract: The primary effort for damping ring wiggler studies has been to develop a credible radiation hard electromagnet wiggler conceptual design that meets NLC main electron and positron damping ring physics requirements [1]. Based upon an early assessment of requirements, a hybrid magnet similar to existing designs satisfies basic requirements. However, radiation damage is potentially a serious problem for the Nd-Fe-B permanent magnet material, and cost remains an issue for samarium cobalt magnets. Superconducting magnet designs have not been

20

Linear Collider Collaboration Tech Notes LCC-0104  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

4 4 October 2002 Beamstrahlung Photon Load on the TESLA Extraction Septum Blade Andrei Seryi Stanford Linear Accelerator Center Stanford, CA 94309, USA Abstract: This note describes work performed in the framework of the International Linear Collider Technical Review Committee [1] to estimate the power load on the TESLA extraction septum blade due to beamstrahlung photons. It is shown, that under realistic conditions the photon load can be several orders of magnitude higher than what was estimated in the TESLA TDR [2] for the ideal Gaussian beams, potentially representing a serious limitation of the current design. Beamstrahlung Photon Load on the TESLA Extraction Septum Blade ANDREI SERYI STANFORD LINEAR

Note: This page contains sample records for the topic "level linear collider" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


21

Governance of the International Linear Collider Project  

SciTech Connect (OSTI)

Governance models for the International Linear Collider Project are examined in the light of experience from similar international projects around the world. Recommendations for one path which could be followed to realize the ILC successfully are outlined. The International Linear Collider (ILC) is a unique endeavour in particle physics; fully international from the outset, it has no 'host laboratory' to provide infrastructure and support. The realization of this project therefore presents unique challenges, in scientific, technical and political arenas. This document outlines the main questions that need to be answered if the ILC is to become a reality. It describes the methodology used to harness the wisdom displayed and lessons learned from current and previous large international projects. From this basis, it suggests both general principles and outlines a specific model to realize the ILC. It recognizes that there is no unique model for such a laboratory and that there are often several solutions to a particular problem. Nevertheless it proposes concrete solutions that the authors believe are currently the best choices in order to stimulate discussion and catalyze proposals as to how to bring the ILC project to fruition. The ILC Laboratory would be set up by international treaty and be governed by a strong Council to whom a Director General and an associated Directorate would report. Council would empower the Director General to give strong management to the project. It would take its decisions in a timely manner, giving appropriate weight to the financial contributions of the member states. The ILC Laboratory would be set up for a fixed term, capable of extension by agreement of all the partners. The construction of the machine would be based on a Work Breakdown Structure and value engineering and would have a common cash fund sufficiently large to allow the management flexibility to optimize the project's construction. Appropriate contingency, clearly apportioned at both a national and global level, is essential if the project is to be realised. Finally, models for running costs and decommissioning at the conclusion of the ILC project are proposed. This document represents an interim report of the bodies and individuals studying these questions inside the structure set up and supervised by the International Committee for Future Accelerators (ICFA). It represents a request for comment to the international community in all relevant disciplines, scientific, technical and most importantly, political. Many areas require further study and some, in particular the site selection process, have not yet progressed sufficiently to be addressed in detail in this document. Discussion raised by this document will be vital in framing the final proposals due to be published in 2012 in the Technical Design Report being prepared by the Global Design Effort of the ILC.

Foster, B.; /Oxford U.; Barish, B.; /Caltech; Delahaye, J.P.; /CERN; Dosselli, U.; /INFN, Padua; Elsen, E.; /DESY; Harrison, M.; /Brookhaven; Mnich, J.; /DESY; Paterson, J.M.; /SLAC; Richard, F.; /Orsay, LAL; Stapnes, S.; /CERN; Suzuki, A.; /KEK, Tsukuba; Wormser, G.; /Orsay, LAL; Yamada, S.; /KEK, Tsukuba

2012-05-31T23:59:59.000Z

22

Broader Impacts of the International Linear Collider  

SciTech Connect (OSTI)

Large-scale scientific endeavors such as the International Linear Collider Project can have a lasting impact on education and outreach to our society. The ILC will provide a discovery platform for frontier physical science and it will also provide a discovery platform for broader impacts and social science. The importance of Broader Impacts of Science in general and the ILC in particular are described. Additionally, a synopsis of education and outreach activities carried out as an integral part of the Snowmass ILC Workshop is provided.

Bardeen, M.; Ruchti, R.

2005-08-01T23:59:59.000Z

23

Linear Collider Collaboration Tech Notes LCC-0109  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

9 9 TESLA 2002-11 CBP Tech Note-269 November 2002 Alignment Stability Models for Damping Rings Andrej Wolski Lawrence Berkeley National Laboratory University of California Berkeley, CA Winfried Decking Deutsches Elektron Synchrotron (DESY) Hamburg, Germany Abstract: Linear collider damping rings are highly sensitive to magnet alignment. Emittance tuning simulations for current designs of damping rings for TESLA and NLC have given encouraging results, but depend on invasive measurements of dispersion. The frequency with which such measurements must be made is therefore an operational issue, and depends on the time stability of the alignment. In this note, we consider three effects that lead to misalignment and the need to retune the damping ring: (1)

24

Helmholtz Alliance Linear Collider Forum Proceedings of the Workshops  

E-Print Network [OSTI]

Helmholtz Alliance Linear Collider Forum Proceedings of the Workshops Hamburg, Munich, Hamburg 2010 of the Helmholtz Alliance Linear Collider Forum 2010­2012, Hamburg, M¨unchen, Hamburg, Germany Conference homepage, Internationales Congress Center, Dresden (at the 4th Annual Workshop of the Helmholtz Alliance `Physics

25

The Next Linear Collider Klystron Development Program  

E-Print Network [OSTI]

Klystrons capable of 75 MW output power at 11.4 GHz have been under development at SLAC for the last decade. The work has been part of the program to realize all the components necessary for the construction of the Next Linear Collider (NLC). The effort has produced a family of solenoid-focused 50 MW klystrons, which are currently powering a 0.5 GeV test accelerator at SLAC and several test stands, where high power components are evaluated and fundamental research is performed studying rf breakdown and dark current production. Continuing development has resulted in a Periodic Permanent Magnet (PPM) focused 50 MW klystron, tested at SLAC and subsequently contracted for manufacture by industry in England and Japan. A 75 MW version of that PPM klystron was built at SLAC and reached 75 MW, with 2.8 microsecond pulses. Based on this design, a prototype 75 MW klystron, designed for low-cost manufacture, is currently under development at SLAC, and will eventually be procured from industry in modest quantities for ad...

Jongewaard, E; Pearson, C; Phillips, R M; Sprehn, D; Vlieks, A E

2000-01-01T23:59:59.000Z

26

LINEAR COLLIDER PHYSICS RESOURCE BOOK FOR SNOWMASS 2001.  

SciTech Connect (OSTI)

The American particle physics community can look forward to a well-conceived and vital program of experimentation for the next ten years, using both colliders and fixed target beams to study a wide variety of pressing questions. Beyond 2010, these programs will be reaching the end of their expected lives. The CERN LHC will provide an experimental program of the first importance. But beyond the LHC, the American community needs a coherent plan. The Snowmass 2001 Workshop and the deliberations of the HEPAP subpanel offer a rare opportunity to engage the full community in planning our future for the next decade or more. A major accelerator project requires a decade from the beginning of an engineering design to the receipt of the first data. So it is now time to decide whether to begin a new accelerator project that will operate in the years soon after 2010. We believe that the world high-energy physics community needs such a project. With the great promise of discovery in physics at the next energy scale, and with the opportunity for the uncovering of profound insights, we cannot allow our field to contract to a single experimental program at a single laboratory in the world. We believe that an e{sup +}e{sup {minus}} linear collider is an excellent choice for the next major project in high-energy physics. Applying experimental techniques very different from those used at hadron colliders, an e{sup +}e{sup {minus}} linear collider will allow us to build on the discoveries made at the Tevatron and the LHC, and to add a level of precision and clarity that will be necessary to understand the physics of the next energy scale. It is not necessary to anticipate specific results from the hadron collider programs to argue for constructing an e{sup +}e{sup {minus}} linear collider; in any scenario that is now discussed, physics will benefit from the new information that e{sup +}e{sup {minus}} experiments can provide.

ABE,T.; DAWSON,S.; HEINEMEYER,S.; MARCIANO,W.; PAIGE,F.; TURCOT,A.S.; ET AL

2001-05-03T23:59:59.000Z

27

RESEARCH AND DEVELOPMENT FOR AN X-BAND LINEAR COLLIDER* C. Adolphsen  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

AND DEVELOPMENT FOR AN AND DEVELOPMENT FOR AN X-BAND LINEAR COLLIDER* C. Adolphsen Stanford Linear Accelerator Center, Stanford University, Stanford CA 94309 USA Abstract At SLAC and KEK research is advancing toward a design for an electron-positron linear collider based on X-Band (11.4 GHz) rf accelerator technology. The nominal acceleration gradient in its main linacs will be about four times that in the Stanford Linear Collider (SLC). The design targets a 1.0 TeV center-of-mass energy but envisions initial operation at 0.5 TeV and allows for expansion to 1.5 TeV. A 10 34 cm -2 s -1 luminosity level will be achieved by colliding multiple bunches per pulse with bunch emittances about two orders of magnitude smaller than those in the SLC. The key components needed to realize such a collider are

28

Vibration Stabilization of a Mechanical Model of a X-Band Linear Collider Final Focus Magnet  

SciTech Connect (OSTI)

The small beam sizes at the interaction point of a X-band linear collider require mechanical stabilization of the final focus magnets at the nanometer level. While passive systems provide adequate performance at many potential sites, active mechanical stabilization is useful if the natural or cultural ground vibration is higher than expected. A mechanical model of a room temperature linear collider final focus magnet has been constructed and actively stabilized with an accelerometer based system.

Frisch, Josef; Chang, Allison; Decker, Valentin; Doyle, Eric; Eriksson, Leif; Hendrickson, Linda; Himel, Thomas; Markiewicz, Thomas; Partridge, Richard; Seryi, Andrei; /SLAC

2006-09-28T23:59:59.000Z

29

Background Simulations for the International Linear Collider  

E-Print Network [OSTI]

on superconducting technology to collide bunches of electrons and positrons. The baseline configuration (about 31 km in a clean experimental environment with low backgrounds. The LHC will likely discover the Higgs boson accelerator directly. DESY FLC, 22603 Hamburg, Germany, adrian.vogel@desy.de 1 #12;Figure 1: Overall view

30

Reliability and Maintainability Issues for the Next Linear Collider  

SciTech Connect (OSTI)

Large accelerators for high energy physics research traditionally have been designed using informal best design, engineering, and management practices to achieve acceptable levels of operational availability. However, the Next Linear Collider(NLC) project presents a particular challenge for operational availability due to the unprecedented size and complexity of the accelerator systems required to achieve the physics goals of high center-of-mass energy and high luminosity. Formal reliability and maintainability analysis, design, and implementation will be required to achieve acceptable operational availability for the high energy physics research program. This paper introduces some of the basic concepts of reliability analysis and applies them to the 2.6-cm microwave power system of the two 10-km-long, 250-GeV linacs that are currently proposed for the NLC design.

Wilson, Zane J.; Gold, Saul L.; Koontz, Ron F.; Lavine, Ted L.; /SLAC

2011-08-26T23:59:59.000Z

31

Linear Collider Final Focus Magnet Construction | Superconducting Magnet  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

Linear Collider Final Focus Magnet Construction Linear Collider Final Focus Magnet Construction The final focus magnets for the International Linear Collider require very small quadrupoles be placed within the detector background field for both the entrance and exit beams. The use of superconducting magnets for this function provide solutions to several problems confronting the machine designers. One constraint is the operation within the 3 tesla detector field. The direct wind magnets are capable of operation without the use of magnetic materials in their construction, making them ideal for compact focussing solutions within detectors. The second constraint is the small physical size dictated by the crossing angle of the beams and proximity to the IR within the detector solenoid. The Direct Wind design does not require a collar to withstand Lorentz

32

LINEAR COLLIDER FINAL DOUBLET CONSIDERATIONS: ATF2 VIBRATION MEASUREMENTS*  

E-Print Network [OSTI]

LINEAR COLLIDER FINAL DOUBLET CONSIDERATIONS: ATF2 VIBRATION MEASUREMENTS* B. Bolzon# , N. Geffroy to measure medium frequency vibrations in vertical axis. First, ground motion was measured for 72 hours vibrations (with their supports) were measured to evaluate their rigidity. The correlation of QD0 and QF1

Paris-Sud XI, Université de

33

Linear Collider Collaboration Tech Notes LCC-0110  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

0 0 December 2002 Post-Target Beamline Design for Proposed FFTB Experiment with Polarized Positrons Y. K. Batygin and J. C. Sheppard Stanford Linear Accelerator Center Stanford University Menlo Park, CA 04025 Abstract: The beamline after positron production target for the proposed experiment E-166 is discussed. The beamline includes bending magnets and solenoid to deliver polarized positron beam from the target to polarimeter. Results of simulation indicate that transmission efficiency of 1...3 % with beam polarization of 60...80 % can be obtained if beam energy resolution is required while the transmission of 40...77 % and polarization of 40% can be obtained without beam energy resolution. 13 December 2002

34

Linear Collider Collaboration Tech Notes LCC-0099  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

099 099 August 2002 Space Charge Dynamics of Bright Electron Beams Alexander W. Chao, Rainer Pitthan, Toshiki Tajima, Dian Yeremian Stanford Linear Accelerator Center Stanford University Abstract: The longitudinal dynamics and its coupling with the transverse dynamics of bunched beams with strong space charge are analyzed. We introduce a self-consistent Vlasov description for the longitudinal phase space similar to the familiar description for the transverse phase space using a Kapchinskij-Vladimirskij (K-V) distribution [1]. A longitudinal beam envelope equation is derived. An exact solution is then obtained when coupling to the transverse dynamics is ignored. This longitudinal envelope equation is coupled to the transverse envelope

35

Linear Collider Collaboration Tech Notes LCC-70  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

70 70 August 2001 Design Studies of Positron Collection for the NLC Yuri K. Batygin, Ninod K. Bharadwaj, David C. Schultz ,John C. Sheppard Stanford Linear Accelerator Center Stanford, CA Abstract: The positron source for the NLC project utilizes a 6.2 GeV electron beam interacting in a high-Z positron production target. The electromagnetic shower in the target results in large energy deposition which can cause damage to the target. Optimization of the collection system is required to insure long-term operation of the target with needed high positron yield into the 6-dimensional acceptance of the subsequent pre-damping ring. Positron tracking through the accelerating system indicates a dilution of the initial positron phase space density. Results of simulations indicate that a

36

Linear Collider Collaboration Tech Notes LCC-0101  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

1 1 August 2002 Collimator Wakefield Calculations for ILC-TRC Report Peter Tenenbaum Stanford Linear Accelerator Center Stanford University Stanford, CA 94309, USA Abstract: We summarize the formalism of collimator wakefields and their effect on beams that are near the center of the collimator gap, and apply the formalism to the TESLA, NLC, and CLIC collimation systems. Collimator Wakefield Calculations for ILC-TRC Report P. Tenenbaum LCC-Note-0101 20-Aug-2002 Abstract We summarize the formalism of collimator wakefields and their effect on beams which are near the center of the collimator gap, and apply the formalism to the TESLA, NLC, and CLIC collimation systems. 1 Introduction One of the beam dynamics effects which must be evaluated for the

37

Linear Collider Collaboration Tech Notes LCC-0063  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

3 3 May 2001 Varying alpha/lambda in NLC Structures - BNS Damping and Emittance Growth G. Stupakov and Z. Li Stanford Linear Accelerator Center Stanford, CA Abstract: In this note we consider the effect of varying this iris opening in the NLC structures on the beam dynamics and the rf efficiency in the linac. Varying a/λ in NLC structures - BNS damping and emittance growth G. Stupakov and Z. Li SLAC, Stanford University, Stanford, CA 94309 In this note we consider the effect of the varying the iris opening a in the NLC structures on the beam dynamics and the RF efficiency in the linac. The most important consequence of the variation of the iris openings is the change of the longitudinal and transverse wakefields. Wake as a function of parameter a for the NLC structures has been previously calculated by K. Bane. Here we will use his

38

Linear Collider Calorimeter Testbeam Study Group Report  

E-Print Network [OSTI]

segmentation to distinguish energy deposits from charged and neutral hadrons, associating the energy clusters#cient single particle shower data at a wide range of energies for EFA development to construct shower librari, jet energy resolutions need to be at the level of 30%/ # E that is capable of distinguishing W and Z

Yu, Jaehoon

39

Linear Collider Calorimeter Testbeam Study Group Report  

E-Print Network [OSTI]

segmentation to distinguish energy deposits from charged and neutral hadrons, associating the energy clusters: · Sufficient single particle shower data at a wide range of energies for EFA development to construct shower , jet energy resolutions need to be at the level of 30%/ E that is capable of distinguishing W and Z

Yu, Jaehoon

40

High-yield positron systems for linear colliders  

SciTech Connect (OSTI)

Linear colliders, such as the SLC, are among those accelerators for which a high-yield positron source operating at the repetition rate of the accelerator is desired. The SLC, having electron energies up to 50 GeV, presents the possibility of generating positron bunches with useful charge even exceeding that of the initial electron bunch. The exact positron yield to be obtained depends on the particular capture, transport and damping system employed. Using 31 GeV electrons impinging on a W-type converter phase-space at the target to the acceptance of the capture rf section, the SLC source is capable of producing, for every electron, up to two positrons within the acceptance of the positron damping ring. The design of this source and the performance of the positron system as built are described. Also, future prospects and limitations for high-yield positron systems are discussed. 11 refs., 5 figs., 3 tabs.

Clendenin, J.E.

1989-04-01T23:59:59.000Z

Note: This page contains sample records for the topic "level linear collider" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


41

Phenomenology of the minimal $B-L$ Model: the Higgs sector at the Large Hadron Collider and future Linear Colliders  

E-Print Network [OSTI]

This Thesis is devoted to the study of the phenomenology of the Higgs sector of the minimal $B-L$ extension of the Standard Model at present and future colliders. Firstly, the motivations that call for the minimal $B-L$ extension are summarised. In addition, the model is analysed in its salient parts. Moreover, a detailed review of the phenomenological allowed Higgs sector parameter space is given. Finally, a complete survey of the distinctive Higgs boson signatures of the model at both the Large Hadron Collider and the future linear colliders is presented.

Giovanni Marco Pruna

2011-06-23T23:59:59.000Z

42

International Linear Collider-A Technical Progress Report  

SciTech Connect (OSTI)

The International Linear Collider: A Technical Progress Report marks the halfway point towards the Global Design Effort fulfilling its mandate to follow up the ILC Reference Design Report with a more optimised Technical Design Report (TDR) by the end of 2012. The TDR will be based on much of the work reported here and will contain all the elements needed to propose the ILC to collaborating governments, including a technical design and implementation plan that are realistic and have been better optimised for performance, cost and risk. We are on track to develop detailed plans for the ILC, such that once results from the Large Hadron Collider (LHC) at CERN establish the main science goals and parameters of the next machine, we will be in good position to make a strong proposal for this new major global project in particle physics. The two overriding issues for the ILC R&D programme are to demonstrate that the technical requirements for the accelerator are achievable with practical technologies, and that the ambitious physics goals can be addressed by realistic ILC detectors. This GDE interim report documents the impressive progress on the accelerator technologies that can make the ILC a reality. It highlights results of the technological demonstrations that are giving the community increased confidence that we will be ready to proceed with an ILC project following the TDR. The companion detector and physics report document likewise demonstrates how detector designs can meet the ambitious and detailed physics goals set out by the ILC Steering Committee. LHC results will likely affect the requirements for the machine design and the detectors, and we are monitoring that very closely, intending to adapt our design as those results become available.

Elsen, Eckhard; /DESY; Harrison, Mike; /Brookhaven; Hesla, Leah; /Fermilab; Ross, Marc; /Fermilab; Royole-Degieux, Perrine; /Paris, IN2P3; Takahashi, Rika; /KEK, Tsukuba; Walker, Nicholas; /DESY; Warmbein, Barbara; /DESY; Yamamoto, Akira; /KEK, Tsukuba; Yokoya, Kaoru; /KEK, Tsukuba; Zhang, Min; /Beijing, Inst. High Energy Phys.

2011-11-04T23:59:59.000Z

43

Linear Collider Final Focus Magnet Construction | Superconducting Magnet  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

Six Layer Quadrupole Six Layer Quadrupole The incoming beam final quad for the linear collider 20 mr option requires a gradient of 140 T/m within a solenoid of 3 Tesla. To meet this goal, a design using 6 around 1 cable bonded to a one inch diameter tube was used. The magnet design required 6 layers of this cable. Two layers were bonded at a time, with S-glass compression wrap every two layers. Final cold testing results were very good, with only two training quenches before reaching short sample. Initial test results at a glance: Background Field Tesla Temp Kelvin Gradient T/m 3 4.3 158 4 4.22 139 5 4.22 134 6 3 137 This data scales to 232 Tesla/meter at 1.9 Kelvin in a 3 Tesla background field. Present field requirements for the 20 mr IR represents 60% of the magnet capability, a comfortable margin. Indeed, even at 4.3 Kelvin in a 3

44

Lepton flavor violation at linear collider experiments in supersymmetric grand unified theories  

E-Print Network [OSTI]

Lepton flavor violation at linear collider experiments is discussed. We show that detectable lepton flavor violation could occur through scalar lepton pair production and decay in the supersymmetric SU(5) grand unified theory in spite of the stringent present experimental constraints by rare process searches. Possible cross sections about 40fb for an e+e- collider and 280fb for an e-e- collider are illustrated.

Masahide Hirouchi; Minoru Tanaka

1997-12-28T23:59:59.000Z

45

Linear Collider LHC Subpanel | U.S. DOE Office of Science (SC)  

Office of Science (SC) Website

Subpanel on the Linear Collider and the Large Hadron Subpanel on the Linear Collider and the Large Hadron Collider High Energy Physics Advisory Panel (HEPAP) HEPAP Home Meetings Members .pdf file (20KB) Charges/Reports Charter .pdf file (44KB) HEP Committees of Visitors HEP Home Charges/Reports Subpanel on the Linear Collider and the Large Hadron Collider Print Text Size: A A A RSS Feeds FeedbackShare Page Joseph Lykken (FNAL) Co-Chair James Siegrist (LBNL) Co-Chair Jonathan Bagger (JHU) Barry Barish (Caltech) Neil Calder (SLAC) Jonathan Feng (UC Irvine) Fred Gilman (Carnegie Mellon) JoAnne Hewett (SLAC) John Huth (Harvard) Judy Jackson (Fermilab) Young-Kee Kim (Chicago) Rocky Kolb (Fermilab) Joe Lykken (Fermilab) Konstantin Matchev (Florida) Hitoshi Murayama (UC Berkeley) Jim Siegrist (UC Berkeley) Paris Sphicas (CERN/Athens)

46

[New technology for linear colliders]. Annual progress report and renewal proposal  

SciTech Connect (OSTI)

This report discusses the following topics on research of microwave amplifiers for linear colliders: Context in current microwave technology development; gated field emission for microwave cathodes; cathode fabrication and tests; microwave cathode design using field emitters; and microwave localization.

McIntyre, P.M.

1992-08-12T23:59:59.000Z

47

Of Linear Colliders, the GDE Workshop at Bangalore, Mughals, Camels, Elephants and Sundials  

SciTech Connect (OSTI)

In this colloquium, the speaker will give a summary of the recent International Linear Collider (ILC) Global Design Effort (GDE) Workshop at Bangalore and how the High Energy Physics community converged to this meeting after many years of electron-positron linear collider design and experimental work. Given that this workshop for the first time took place in India, the speaker will also show a few pictures and talk briefly about what he learned in that fascinating country.

Loew, Greg

2006-04-17T23:59:59.000Z

48

Compact IR Quadrupoles for Linear Colliders Based on Rutherford-type Cable  

SciTech Connect (OSTI)

The upcoming and disrupted beams in the interaction region (IR) of a linear collider are focused by doublets consisting of two small-aperture superconducting quadrupoles. These magnets need an effective compact magnetic shielding to minimize magnetic coupling between the two channels and sufficient temperature margin to withstand radiation-induced heat depositions in the coil. This paper presents conceptual designs of IR quadrupoles for linear colliders based on NbTi and Nb{sub 3}Sn Rutherford-type cables.

Lopes, M.L.; Kashikhin, V.S.; Kashikhin, V.V.; Zlobin, A.V.; /Fermilab

2008-08-01T23:59:59.000Z

49

A low emittance, flat-beam electron source for linear colliders  

Science Journals Connector (OSTI)

We present a method to generate a flat (large horizontal to vertical emittance ratio) electron beam suitable for linear colliders. The concept is based on a round-beam rf photoinjector with finite solenoid field at the cathode together with a special beam optics adapter. Computer simulations of this new type of beam source show that the beam quality required for a linear collider may be obtainable without the need for an electron damping ring.

R. Brinkmann; Y. Derbenev; K. Flttmann

2001-05-18T23:59:59.000Z

50

Detectors for Linear Colliders: Calorimetry at a Future Electron-Positron Collider (3/4)  

ScienceCinema (OSTI)

Calorimetry will play a central role in determining the physics reach at a future e+e- collider. The requirements for calorimetry place the emphasis on achieving an excellent jet energy resolution. The currently favoured option for calorimetry at a future e+e- collider is the concept of high granularity particle flow calorimetry. Here granularity and a high pattern recognition capability is more important than the single particle calorimetric response. In this lecture I will describe the recent progress in understanding the reach of high granularity particle flow calorimetry and the related R&D; efforts which concentrate on test beam demonstrations of the technological options for highly granular calorimeters. I will also discuss alternatives to particle flow, for example the technique of dual readout calorimetry.

None

2011-10-06T23:59:59.000Z

51

Triple Higgs boson production at the high-energy Photon Linear Collider in the Higgs triplet model  

Science Journals Connector (OSTI)

Besides the SM-like Higgs boson h, the Higgs triplet model (HTM) predicts the existence of charged and doubly charged Higgs bosons ( and ). In this letter, we focus on the study of the triple Higgs production in ?? collisions at the high-energy linear collider: and . We present the production cross-sections and the distributions of the various observables, i.e., the distributions of the energy and the transverse momenta of the SM-like Higgs boson and charged Higgs bosons. Our numerical results show that, with reasonable parameter values, the values of the cross-sections for two processes can reach the level of several tens of fb and hundreds of fb, respectively. Due to the small SM background, the possible signals of and might be detected via these processes in the future high-energy linear-collider experiments.

Jie-Fen Shen; Yan-Ping Bi

2014-01-01T23:59:59.000Z

52

CONSTRAINTS ON LASER-DRIVEN ACCELERATORS FOR A HIGH-ENERGY LINEAR COLLIDER*  

E-Print Network [OSTI]

CONSTRAINTS ON LASER-DRIVEN ACCELERATORS FOR A HIGH-ENERGY LINEAR COLLIDER* J.S. Wurtele and AV on 1 TeV) are applied to free-space laser and laser/plasma accelerators. It is shown that the requirements impose very severe constraints upon the new accelerators-- so severe, that it seems unlikely

Wurtele, Jonathan

53

A High Intensity Linear e+ e- Collider Facility at Low Energy  

E-Print Network [OSTI]

I discuss a proposal for a high intensity $e^+e^-$ linear collider operated at low center of mass energies $\\sqrt{s}intensity beams. Such a facility would provide high statistics samples of (charmed) vector mesons and would permit searches for LFV with unprecedented precision in decays of $\\tau$ leptons and mesons. Implications on the design of the linear accelerator are discussed together with requirements to achieve luminosities of $10^{35}$ cm$^{-2}$s$^{-1}$ or more.

A. Schoning

2006-10-23T23:59:59.000Z

54

Assessing Risk in Costing High-energy Accelerators: from Existing Projects to the Future Linear Collider  

E-Print Network [OSTI]

High-energy accelerators are large projects funded by public money, developed over the years and constructed via major industrial contracts both in advanced technology and in more conventional domains such as civil engineering and infrastructure, for which they often constitute one-of markets. Assessing their cost, as well as the risk and uncertainty associated with this assessment is therefore an essential part of project preparation and a justified requirement by the funding agencies. Stemming from the experience with large circular colliders at CERN, LEP and LHC, as well as with the Main Injector, the Tevatron Collider Experiments and Accelerator Upgrades, and the NOvA Experiment at Fermilab, we discuss sources of cost variance and derive cost risk assessment methods applicable to the future linear collider, through its two technical approaches for ILC and CLIC. We also address disparities in cost risk assessment imposed by regional differences in regulations, procedures and practices.

Lebrun, Philippe

2010-01-01T23:59:59.000Z

55

Effects of R-parity violating supersymmetry in top pair production at linear colliders with polarized beams  

E-Print Network [OSTI]

In the minimal supersymmetric standard model with R-parity violation, the lepton number violating top quark interactions can contribute to the top pair production at a linear collider via tree-level u-channel squark exchange diagrams. We calculate such contributions and find that in the allowed range of these R-violating couplings, the top pair production rate as well as the top quark polarization and the forward-backward asymmetry can be significantly altered. By comparing the unpolarized beams with the polarized beams, we find that the polarized beams are more powerful in probing such new physics.

Xuelei Wang; Jitao Li; Suzhen Liu

2006-11-06T23:59:59.000Z

56

The role of polarized positrons and electrons in revealing fundamental interactions at the Linear Collider  

E-Print Network [OSTI]

The proposed International Linear Collider (ILC) is well-suited for discovering physics beyond the Standard Model and for precisely unraveling the structure of the underlying physics. The physics return can be maximized by the use of polarized beams. This report shows the paramount role of polarized beams and summarizes the benefits obtained from polarizing the positron beam, as well as the electron beam. The physics case for this option is illustrated explicitly by analyzing reference reactions in different physics scenarios. The results show that positron polarization, combined with the clean experimental environment provided by the linear collider, allows to improve strongly the potential of searches for new particles and the identification of their dynamics, which opens the road to resolve shortcomings of the Standard Model. The report also presents an overview of possible designs for polarizing both beams at the ILC, as well as for measuring their polarization.

G. Moortgat-Pick; T. Abe; G. Alexander; B. Ananthanarayan; A. A. Babich; V. Bharadwaj; D. Barber; A. Bartl; A. Brachmann; S. Chen; J. Clarke; J. E. Clendenin; J. Dainton; K. Desch; M. Diehl; B. Dobos; T. Dorland; H. Eberl; J. Ellis; K. Flttmann; H. Fraas; F. Franco-Sollova; F. Franke; A. Freitas; J. Goodson; J. Gray; A. Han; S. Heinemeyer; S. Hesselbach; T. Hirose; K. Hohenwarter-Sodek; J. Kalinowski; T. Kernreiter; O. Kittel; S. Kraml; W. Majerotto; A. Martinez; H. -U. Martyn; W. Menges; A. Mikhailichenko; K. Mnig; K. Moffeit; S. Moretti; O. Nachtmann; F. Nagel; T. Nakanishi; U. Nauenberg; T. Omori; P. Osland; A. A. Pankov; N. Paver; R. Pitthan; R. Pschl; W. Porod; J. Proulx; P. Richardson; S. Riemann; S. D. Rindani; T. G. Rizzo; P. Schler; C. Schwanenberger; D. Scott; J. Sheppard; R. K. Singh; H. Spiesberger; A. Stahl; H. Steiner; A. Wagner; G. Weiglein; G. W. Wilson; M. Woods; P. Zerwas; J. Zhang; F. Zomer

2005-07-01T23:59:59.000Z

57

Alighment and Vibration Issues in TeV Linear Collider Design  

SciTech Connect (OSTI)

The next generation of linear colliders will require alignment accuracies and stabilities of component placement at least one, perhaps two, orders of magnitude better than can be achieved by the conventional methods and procedures in practice today. The magnitudes of these component-placement tolerances for current designs of various linear collider subsystems are tabulated. In the micron range, long-term ground motion is sufficiently rapid that on-line reference and mechanical correction systems are called for. Some recent experiences with the upgraded SLAC laser alignment systems and examples of some conceivable solutions for the future are described. The so called ''girder'' problem is discussed in the light of ambient and vibratory disturbances. The importance of the quality of the underlying geology is stressed. The necessity and limitations of particle-beam-derived placement information are mentioned.

Fischer, G.E.; /SLAC

2005-08-12T23:59:59.000Z

58

Shielded coherent synchrotron radiation and its possible effect in the next linear collider  

SciTech Connect (OSTI)

Shielded coherent synchrotron radiation is discussed in two cases: (1) a beam following a curved path in a plane midway between two parallel, perfectly conducting plates, and (2) a beam circulating in a toroidal chamber with resistive walls. Wake fields and the radiated energy are computed with parameters for the high-energy bunch compressor of the Next Linear Collider. 5 refs., 4 figs., 1 tab.

Warnock, R.L.

1991-05-01T23:59:59.000Z

59

DEPFET active pixel detectors for a future linear $e^+e^-$ collider  

E-Print Network [OSTI]

The DEPFET collaboration develops highly granular, ultra-transparent active pixel detectors for high-performance vertex reconstruction at future collider experiments. The characterization of detector prototypes has proven that the key principle, the integration of a first amplification stage in a detector-grade sensor material, can provide a comfortable signal to noise ratio of over 40 for a sensor thickness of 50-75 $\\mathrm{\\mathbf{\\mu m}}$. ASICs have been designed and produced to operate a DEPFET pixel detector with the required read-out speed. A complete detector concept is being developed, including solutions for mechanical support, cooling and services. In this paper the status of DEPFET R & D project is reviewed in the light of the requirements of the vertex detector at a future linear $\\mathbf{e^+ e^-}$ collider.

Alonso, O; Dieguez, A; Dingfelder, J; Hemperek, T; Kishishita, T; Kleinohl, T; Koch, M; Krueger, H; Lemarenko, M; Luetticke, F; Marinas, C; Schnell, M; Wermes, N; Campbell, A; Ferber, T; Kleinwort, C; Niebuhr, C; Soloviev, Y; Steder, M; Volkenborn, R; Yaschenko, S; Fischer, P; Kreidl, C; Peric, I; Knopf, J; Ritzert, M; Curras, E; Lopez-Virto, A; Moya, D; Vila, I; Boronat, M; Esperante, D; Fuster, J; Garcia Garcia, I; Lacasta, C; Oyanguren, A; Ruiz, P; Timon, G; Vos, M; Gessler, T; Kuehn, W; Lange, S; Muenchow, D; Spruck, B; Frey, A; Geisler, C; Schwenker, B; Wilk, F; Barvich, T; Heck, M; Heindl, S; Lutz, O; Mueller, Th; Pulvermacher, C; Simonis, H.J; Weiler, T; Krausser, T; Lipsky, O; Rummel, S; Schieck, J; Schlueter, T; Ackermann, K; Andricek, L; Chekelian, V; Chobanova, V; Dalseno, J; Kiesling, C; Koffmane, C; Gioi, L.Li; Moll, A; Moser, H.G; Mueller, F; Nedelkovska, E; Ninkovic, J; Petrovics, S; Prothmann, K; Richter, R; Ritter, A; Ritter, M; Simon, F; Vanhoefer, P; Wassatsch, A; Dolezal, Z; Drasal, Z; Kodys, P; Kvasnicka, P; Scheirich, J

2013-01-01T23:59:59.000Z

60

Gauge-Higgs-fermion spin-spin effects at the Stanford Linear Collider (and CERN LEP)  

Science Journals Connector (OSTI)

We consider the various spin-spin effects in the processes e+e-???i0??j0 and e+e-???i+??j- at Stanford Linear Collider (SLC) energies, where ??j0 and ??j are gauge-Higgs fermions associated with the (minimal) supersymmetric extension of the standard SU3cSU2LU1 model and are understood to decay in model-dependent ways. We argue that such effects may very well be visible at SLC (and CERN LEP) energies. We give a general theoretical apparatus for discussing these effects and assessing their various manifestations. We work out some illustrative examples of such manifestations.

B. F. L. Ward

1987-04-01T23:59:59.000Z

Note: This page contains sample records for the topic "level linear collider" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


61

Linear Collider Collaboration Tech Notes LCC-0073 SLAC-PUB-9004  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

3 3 SLAC-PUB-9004 September 2001 Microwave Quadrupoles for Beam Break-up Supression In the NLC Main Linac K.L.F. Bane and G. Stupakov Stanford Linear Accelerator Center Stanford, CA Abstract: This is a preliminary study of the effect of using microwave quads (MQs) instead of rf phase shifting to induce BNS damping in the main linac of the NLC collider. We consider MQs running at X-band, and find that the total length of MQs needed for the NLC is 6% of the total length of the accelerating structures. We show through simulations that, by using MQs instead of phase shifting for BNS damping, the quad alignment tolerances can be relaxed but at the expense of shifting the tight tolerances to the MQs; this can be advantageous if the MQs can be better aligned

62

Investigation into electron cloud effects in the International Linear Collider positron damping ring  

SciTech Connect (OSTI)

We report modeling results for electron cloud buildup and instability in the International Linear Collider positron damping ring. Updated optics, wiggler magnets, and vacuum chamber designs have recently been developed for the 5 GeV, 3.2-km racetrack layout. An analysis of the synchrotron radiation profile around the ring has been performed, including the effects of diffuse and specular photon scattering on the interior surfaces of the vacuum chamber. The results provide input to the cloud buildup simulations for the various magnetic field regions of the ring. The modeled cloud densities thus obtained are used in the instability threshold calculations. We conclude that the mitigation techniques employed in this model will suffice to allow operation of the damping ring at the design operational specifications

Crittenden, J.A.; Conway, J.; Dugan, G.F.; Palmer, M.A.; Rubin, D.L.; Shanks, J.; Sonnad, K.G.; Boon, L.; Harkay, K.; Ishibashi, T.; Furman, M.A.; Guiducci, S.; Pivi, M.T.F.; Wang, L.; Crittenden, J.A.; Conway, J.; Dugan, G.F.; Palmer, M.A.; Rubin, D.L.; Shanks, J.; Sonnad, K.G.; Boon, L.; Harkay, K.; Ishibashi, T.; Furman, M.A.; Guiducci, S.; Pivi, M.T.F.; Wang, L.

2014-02-28T23:59:59.000Z

63

Interim report on the Global Design Effort Global International Linear Collider (ILC) R&D  

SciTech Connect (OSTI)

The International Linear Collider: A Technical Progress Report marks the halfway point towards the Global Design Effort fulfilling its mandate to follow up the ILC Reference Design Report with a more optimised Technical Design Report (TDR) by the end of 2012. The TDR will be based on much of the work reported here and will contain all the elements needed to propose the ILC to collaborating governments, including a technical design and implementation plan that are realistic and have been better optimised for performance, cost and risk. We are on track to develop detailed plans for the ILC, such that once results from the Large Hadron Collider (LHC) at CERN establish the main science goals and parameters of the next machine, we will be in good position to make a strong proposal for this new major global project in particle physics. The two overriding issues for the ILC R&D programme are to demonstrate that the technical requirements for the accelerator are achievable with practical technologies, and that the ambitious physics goals can be addressed by realistic ILC detectors. This GDE interim report documents the impressive progress on the accelerator technologies that can make the ILC a reality. It highlights results of the technological demonstrations that are giving the community increased confidence that we will be ready to proceed with an ILC project following the TDR. The companion detector and physics report document likewise demonstrates how detector designs can meet the ambitious and detailed physics goals set out by the ILC Steering Committee. LHC results will likely affect the requirements for the machine design and the detectors, and we are monitoring that very closely, intending to adapt our design as those results become available.

Harrison, M.

2011-04-30T23:59:59.000Z

64

E-Print Network 3.0 - acceleration linear collider Sample Search...  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

PARTICLES Electrons can be produced by Summary: is invariant Many current particle accelerators are used to collide high energy particle beams. The majority... of accelerators are...

65

The Vertex Tracker at the e+e- Linear Collider Conceptual Design, Detector R&D and Physics Performances for the Next Generation of Silicon Vertex Detectors  

E-Print Network [OSTI]

The e+e- linear collider physics programme sets highly demanding requirements on the accurate determination of charged particle trajectories close to their production point. A new generation of Vertex Trackers, based on different technologies of high resolution silicon sensors, is being developed to provide the needed performances. These developments are based on the experience with the LEP/SLC vertex detectors and on the results of the R&D programs for the LHC trackers and also define a further program of R&D specific to the linear collider applications. In this paper the present status of the conceptual tracker design, silicon detector R&D and physics studies is discussed.

Marco Battaglia; Massimo Caccia

1999-11-26T23:59:59.000Z

66

Linear Collider Collaboration Tech Notes LCC-0113 CBP Tech Note-276  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

3 3 CBP Tech Note-276 February 2003 The NLC Main Damping Ring Lattice Mark Woodley 1 and Andrzej Wolski 2 1 Stanford Linear Accelerator Center Stanford University Menlo Park, CA 04025 2 Lawrence Berkeley National Laboratory University of California Berkeley, CA Abstract: Studies of the NLC Main Damping Ring lattice since April 2001 have indicated that there are a number of collective effects that potentially limit operational performance. One possible way to reduce the impact of these effects is to raise the momentum compaction of the lattice, which requires a significant redesign. In this note, we present a lattice that has a momentum compaction four times larger than the previous design. We discuss the linear and nonlinear dynamical properties of the lattice, and

67

Linear Collider Collaboration Tech Notes LCC-0062 CBP-tech Note228  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

2 2 CBP-tech Note228 May 2001 Symplectic Integrators for Nonlinear Wiggler Fields Andrzej Wolski Lawrence Berkeley National Laboratory Abstract: To achieve fast damping, the NLC Main Damping Ring uses a wiggler with high field strength, 2.15 T, and over 45 m in length. An ideal wiggler with infinitely wide pole pieces may be treated as a linear eleme nt, and has no impact on the dynamic aperture. However, the integrated nonlinear components from a real wiggler with integrated field over 100 T 2 m can be significant, and the choice of methods for studying the effects in such cases is limited at present. We present two possibilities for symplectic tracking through a wiggler taking full account of the nonlinear components of the field, compare the results with

68

Photon collider Higgs factories  

E-Print Network [OSTI]

The discovery of the Higgs boson (and still nothing else) have triggered appearance of many proposals of Higgs factories for precision measurement of the Higgs properties. Among them there are several projects of photon colliders (PC) without e+e- in addition to PLC based on e+e- linear colliders ILC and CLIC. In this paper, following a brief discussion of Higgs factories physics program I give an overview of photon colliders based on linear colliders ILC and CLIC, and of the recently proposed photon-collider Higgs factories with no e+e- collision option based on recirculation linacs in ring tunnels.

V. I. Telnov

2014-09-19T23:59:59.000Z

69

Neutral Higgs-pair production at Linear Colliders within the general 2HDM: quantum effects and triple Higgs boson self-interactions  

E-Print Network [OSTI]

The pairwise production of neutral Higgs bosons is analyzed in the context of the future linear colliders, such as the ILC and CLIC, within the general Two-Higgs-Doublet Model (2HDM). The corresponding cross-sections are computed at the one-loop level in full compliance with the current phenomenological bounds and the stringent theoretical constraints inherent to the consistency of the model. We uncover regions across the 2HDM parameter space, mainly for low tan\\beta near 1 and moderate values of the relevant lambda_5 parameter, wherein the radiative corrections to the Higgs-pair production cross sections can comfortably reach 50% This behavior can be traced back to the enhancement capabilities of the trilinear Higgs self-interactions -- a trademark feature of the 2HDM, with no counterpart in the Minimal Supersymmetric Standard Model. Interestingly enough, the quantum effects are positive for energies around 500 GeV, thereby producing a significant enhancement in the expected number of events precisely around the fiducial startup energy of the ILC. The Higgs-pair production rates can be substantial, typically amounting to a few thousand events per 500 inverse femtobarn of integrated luminosity. In contrast, the corrections are negative in the highest energy range (1 TeV). We also compare the exclusive pairwise production of Higgs bosons with the inclusive gauge boson fusion channels leading to 2H+X finals states, and also with the exclusive triple Higgs boson production. We find that these multiparticle final states can be highly complementary in the overall Higgs bosons search strategy.

David Lopez-Val; Joan Sola

2010-01-08T23:59:59.000Z

70

Preliminary design report of a relativistic-Klystron two-beam-accelerator based power source for a 1 TeV center-of-mass next linear collider  

SciTech Connect (OSTI)

A preliminary point design for an 11.4 GHz power source for a 1 TeV center-of-mass Next Linear Collider (NLC) based on the Relativistic-Klystron Two-Beam-Accelerator (RK-TBA) concept is presented. The present report is the result of a joint LBL-LLNL systems study. consisting of three major thrust areas: physics, engineering, and costing. The new RK-TBA point design, together with our findings in each of these areas, are reported.

Yu, S.; Goffeney, N.; Henestroza, E. [Lawrence Berkeley Lab., CA (United States)] [and others

1995-02-22T23:59:59.000Z

71

Physics Reach at Future Colliders  

SciTech Connect (OSTI)

The physics reach at future colliders is discussed, with focus on the Higgs sector. First we present the Standard Model and some results obtained at the existing high-energy hadron collider, Tevatron, together with the corresponding expectations for the Large Hadron Collider (LHC), which starts operating in 2008. Then we discuss important low energy measurements: the anomalous magnetic moment for muon and the leptonic B-decay together with b{yields}s{gamma}. Finally the potential of the planned e{sup +}e{sup -} International Linear Collider (ILC) and its possible option Photon Linear Collider (PLC), e{gamma} and {gamma}{gamma}, is shortly presented.

Krawczyk, Maria [Institute of Theoretical Physics, University of Warsaw, ul. Hoz-dota 69, 00-681 Warsaw (Poland); CERN, CH-1211 Geneva 23 (Switzerland)

2007-11-27T23:59:59.000Z

72

PHYSICAL REVIEW SPECIAL TOPICS -ACCELERATORS AND BEAMS, VOLUME 5, 011001 (2002) Energy doubler for a linear collider  

E-Print Network [OSTI]

, California 90089 W. B. Mori, C. Joshi, R. Hemker, E. S. Dodd, C. E. Clayton, K. A. Marsh, B. Blue, and S. Wang University of California, Los Angeles, Los Angeles, California 90095 R. Assmann, F. J. Decker, M. Hogan, R. Iverson, and D. Walz Stanford Linear Accelerator Center, Stanford University, Stanford

73

Linear Collider Test Facility: Twiss Parameter Analysis at the IP/Post-IP Location of the ATF2 Beam Line  

SciTech Connect (OSTI)

At the first stage of the ATF2 beam tuning, vertical beam size is usually bigger than 3 {micro}m at the IP. Beam waist measurements using wire scanners and a laser wire are usually performed to check the initial matching of the beam through to the IP. These measurements are described in this paper for the optics currently used ({beta}{sub x} = 4cm and {beta}{sub y} = 1mm). Software implemented in the control room to automate these measurements with integrated analysis is also described. Measurements showed that {beta} functions and emittances were within errors of measurements when no rematching and coupling corrections were done. However, it was observed that the waist in the horizontal (X) and vertical (Y) plane was abnormally shifted and simulations were performed to try to understand these shifts. They also showed that multiknobs are needed in the current optics to correct simultaneously {alpha}{sub x}, {alpha}{sub y} and the horizontal dispersion (D{sub x}). Such multiknobs were found and their linearity and orthogonality were successfully checked using MAD optics code. The software for these multiknobs was implemented in the control room and waist scan measurements using the {alpha}{sub y} knob were successfully performed.

Bolzon, Benoit; /Annecy, LAPP; Jeremie, Andrea; /Annecy, LAPP; Bai, Sha; /Beijing, Inst. High Energy Phys.; Bambade, Philip; /KEK, Tsukuba; White, Glen; /SLAC

2012-07-02T23:59:59.000Z

74

Linear Collider Collaboration Tech Notes  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

1 03/12/99 1 03/12/99 NLC Damping Ring Wiggler Studies 1999 December 3, 1999 J. Corlett, N. Hartmann, K. Kennedy, G. Koehler, S. Marks, J. Rasson, T. Saleh Lawrence Berkeley National Laboratory Berkeley, CA, USA Abstract: The primary objective of FY99 was to develop credible conceptual wiggler requirements. Three magnet technologies were considered: electromagnet, hybrid permanent magnet and superconducting. Based upon an early assessment of requirements, a hybrid magnet similar to existing designs, with appropriate modification of gap and period, satisfies basic requirements. However, radiation damage is potentially a serious problem for the ND-FE-B permanent magnet material, and cost remains an issue for samarium cobalt magnets. Therefore the primary effort was put into developing a radiation-hard electromagnet wiggler conceptual

75

The Next Linear Collider Program  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

NLC Navbar Links NLC Navbar Links NLC Home Page NLC News Letter http://www-project.slac.stanford.edu/lc/local/Newsletter/backnumber.htm Standing Meetings http://www-project.slac.stanford.edu/lc/local/notes/Meetings-Schedule.html Notes & Report http://www-project.slac.stanford.edu/lc/home-page_new/meetings-and-notes.html Seminars http://www-project.slac.stanford.edu/lc/local/NLCSeminars/nlc_seminars_index.htm Workshops http://www-project.slac.stanford.edu/lc/wkshp/Wrkshops.htm Image Collections http://www.slac.stanford.edu/cgi-wrap/search-mtg?ABC&L=grp/ad/images/ Legacy Links http://www-project.slac.stanford.edu/lc/home-page_new/nlc-home-us.html NLC-Technical Safety Policy http://www-project.slac.stanford.edu/lc/local/Admin/Safety_Policy.html Video Collaboration Meetings

76

Soviets Plan Huge Linear Collider  

Science Journals Connector (OSTI)

...want to increase worker productivity. One package, the Auto-AOC (for Advanced Office Controls), contains 223 blocks of time...a worker should open in an hour, he would enter into Auto-AOC the letters "GRSF," for Gather, Receive, Sealed enve-lope...

MARK CRAWFORD

1987-10-02T23:59:59.000Z

77

Disruption limits for linear colliders  

Science Journals Connector (OSTI)

Beam behavior in a single-pass collision device has been investigated using a cloud-in-cells plasma simulation code. The intense electromagnetic fields of the beams produce mutual focusing effects whose strength is determined by the disruption parameter D. The consequent decrease in the beam radii causes an increase in the luminosity of a single collision. The dependences of the beam behavior on beam profiles and current density are described. The beam behavior is stable for several plasma oscillations and indicates that high luminosity can be achieved in single-pass collision devices by using intense beams.

Robert Hollebeek

1981-01-01T23:59:59.000Z

78

Ion Colliders  

E-Print Network [OSTI]

High-energy ion colliders are large research tools in nuclear physics to study the Quark-Gluon-Plasma (QGP). The range of collision energy and high luminosity are important design and operational considerations. The experiments also expect flexibility with frequent changes in the collision energy, detector fields, and ion species. Ion species range from protons, including polarized protons in RHIC, to heavy nuclei like gold, lead and uranium. Asymmetric collision combinations (e.g. protons against heavy ions) are also essential. For the creation, acceleration, and storage of bright intense ion beams, limits are set by space charge, charge change, and intrabeam scattering effects, as well as beam losses due to a variety of other phenomena. Currently, there are two operating ion colliders, the Relativistic Heavy Ion Collider (RHIC) at BNL, and the Large Hadron Collider (LHC) at CERN.

Fischer, W

2015-01-01T23:59:59.000Z

79

Resurgence, Stokes phenomenon and alien derivatives for level-one linear  

E-Print Network [OSTI]

Resurgence, Stokes phenomenon and alien derivatives for level-one linear differential systems. Mich of alien derivatives. We make explicit the Stokes-Ramis matrices as functions of the connection constants, summability, resurgence, alien derivatives. AMS classification: 34M03, 34M30, 34M35, 34M40. 1 #12;Loday

80

Resurgence, Stokes phenomenon and alien derivatives for level-one linear  

E-Print Network [OSTI]

Resurgence, Stokes phenomenon and alien derivatives for level-one linear differential systems. Mich of alien derivatives. We make explicit the Stokes-Ramis matrices as functions of the connection constants, summability, resurgence, alien derivatives. AMS classification: 34M03, 34M30, 34M35, 34M40. 1 hal-00491614

Boyer, Edmond

Note: This page contains sample records for the topic "level linear collider" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


81

Muon Collider  

SciTech Connect (OSTI)

Parameters are given of muon colliders with center of mass energies of 1.5 and 3 TeV. Pion production is from protons on a mercury target. Capture, decay, and phase rotation yields bunch trains of both muon signs. Six dimensional cooling reduces the emittances until the trains are merged into single bunches, one of each sign. Further cooling in 6 dimensions is then applied, followed by final transverse cooling in 50 T solenoids. After acceleration the muons enter the collider ring. Ongoing R&D is discussed.

Palmer, R.

2009-10-19T23:59:59.000Z

82

Resurgence, Stokes phenomenon and alien derivatives for level-one linear differential systems  

E-Print Network [OSTI]

A precise description of the singularities of the Borel transform of solutions of a level-one linear differential system is deduced from a proof of the summable-resurgence of the solutions by the perturbative method of J. \\'Ecalle. Then we compare the meromorphic classification (Stokes phenomenon) from the viewpoint of the Stokes cocycle and the viewpoint of alien derivatives. We make explicit the Stokes-Ramis matrices as functions of the connection constants in the Borel plane and we develop two examples. No assumption of genericity is made.

Loday-Richaud, Michle

2010-01-01T23:59:59.000Z

83

LASER-PLASMA-ACCELERATOR-BASED GAMMA GAMMA COLLIDERS  

E-Print Network [OSTI]

LASER-PLASMA-ACCELERATOR-BASED ?? COLLIDERS ? C. B.linear col- lider based on laser-plasma-accelerators arediscussed, and a laser-plasma-accelerator-based gamma-

Schroeder, C. B.

2010-01-01T23:59:59.000Z

84

Muon Collider Progress: Accelerators  

E-Print Network [OSTI]

A N. V. Mokhov et al. , Muon Collider Interaction RegionR. B. Palmer et al. , Muon Colliders, in the 9th AdvancedB. Palmer and R. Fernow, Muon Collider Final Cooling in 30

Zisman, Michael S.

2012-01-01T23:59:59.000Z

85

LASER-PLASMA-ACCELERATOR-BASED COLLIDERS C. B. Schroeder  

E-Print Network [OSTI]

LASER-PLASMA-ACCELERATOR-BASED COLLIDERS C. B. Schroeder , E. Esarey, Cs. T´oth, C. G. R. Geddes-generation linear col- lider based on laser-plasma-accelerators are discussed, and a laser-plasma-accelerator gamma-gamma () collider is considered. An example of the parameters for a 0.5 TeV laser-plasma-accelerator collider

Geddes, Cameron Guy Robinson

86

Conventional power sources for colliders  

SciTech Connect (OSTI)

At SLAC we are developing high peak-power klystrons to explore the limits of use of conventional power sources in future linear colliders. In an experimental tube we have achieved 150 MW at 1 ..mu..sec pulse width at 2856 MHz. In production tubes for SLAC Linear Collider (SLC) we routinely achieve 67 MW at 3.5 ..mu..sec pulse width and 180 pps. Over 200 of the klystrons are in routine operation in SLC. An experimental klystron at 8.568 GHz is presently under construction with a design objective of 30 MW at 1 ..mu..sec. A program is starting on the relativistic klystron whose performance will be analyzed in the exploration of the limits of klystrons at very short pulse widths.

Allen, M.A.

1987-07-01T23:59:59.000Z

87

The Large Hadron Electron Collider Project  

E-Print Network [OSTI]

A Conceptual Design Report (CDR) for the Large Hadron Electron Collider, the LHeC, is being prepared, to which an introduction was given for the plenary panel discussion on the future of deep inelastic scattering held at DIS09. This is briefly summarised here. The CDR will comprise designs of the ep/eA collider, based on ring and linear electron accelerators, of the interaction region, designed for simultaneous $ep$ and $pp$ operation, of a new, modular detector, and it will present basics on the physics motivation for a high luminous Tera scale electron-nucleon collider as a complement to the LHC.

Max Klein

2009-08-20T23:59:59.000Z

88

The Muon Collider  

E-Print Network [OSTI]

11] D. Summers et al. , Muon Acceleration to 750 GeV in theThe muon collider M. S. Zisman * Lawrence Berkeley Nationalnew type of accelerator, the muon collider. This accelerator

Zisman, Michael S.

2011-01-01T23:59:59.000Z

89

The Muon Collider  

E-Print Network [OSTI]

11] D. Summers et al. , Muon Acceleration to 750 GeV in theThe muon collider M. S. Zisman * Lawrence Berkeley Nationalnew type of accelerator, the muon collider. This accelerator

Zisman, Michael S

2010-01-01T23:59:59.000Z

90

Muon collider gains momentum  

Science Journals Connector (OSTI)

... , US scientists staked their claim in a daring new venture: the world's first muon collider. The collider could overtake two more-mature concepts, each of which plan to ... expected to achieve. They are now trying to rally enthusiasm for a collider that smashes muons, a particle that is about 200 times more massive than the electron. ...

Eric Hand

2009-11-18T23:59:59.000Z

91

International linear collider reference design report  

E-Print Network [OSTI]

LV power. All HV and MV substations - including the one atto the utilitys HV transmission system via a main substation

Aarons, G.

2008-01-01T23:59:59.000Z

92

High Resolution BPM for Linear Colliders  

SciTech Connect (OSTI)

A high resolution Beam Position Monitor (BPM) is necessary for the beam-based alignment systems of high energy and low emittance electron linacs. Such a monitor is developed in the framework of the European CARE/SRF programme, in a close collaboration between DESY and CEA/DSM/DAPNIA. This monitor is a radiofrequency re-entrant cavity, which can be used either at room or cryogenic temperature, in an environment where dust particle contamination has to be avoided, such as superconducting cavities in a cryomodule. A first prototype of a re-entrant BPM has already delivered measurements at 2K. inside the first cryomodule (ACC1) on the TESLA Test Facility 2 (TTF2). The performances of this BPM are analyzed both experimentally and theoretically, and the limitations of this existing system clearly identified. A new cavity and new electronics have been designed in order to improve the position resolution down to 1 {mu}m and the damping time down to 10 ns.

Simon, C.; Chel, S.; Luong, M.; Napoly, O.; Novo, J.; Roudier, D. [Centre a l'Energie Atomique/Saclay, DSM/DAPNIA/SACM, F91191 Gif-sur-Yvette Cedex (France); Baboi, N.; Noelle, D.; Mildner, N.; Zapfe, K. [Deutsches Elektronen Synchroton, Notkestasse 85, D-22603 Hamburg (Germany); Rouviere, N. [Centre National de Recherche Scientifique, IN2P3 - IPN/Orsay, F91406 Orsay Cedex (France)

2006-11-20T23:59:59.000Z

93

International linear collider reference design report  

E-Print Network [OSTI]

m Shaft with Underground Cavern, Service and Beam Tunnels (Hall, showing BDS Service Cavern Arrangement 4.2-6 4.4-1 AirConstruction Water Halls Caverns e ? ML Shaft Base Caverns

Aarons, G.

2008-01-01T23:59:59.000Z

94

International linear collider reference design report  

E-Print Network [OSTI]

regions provide for a main substation located at or near thesystem via a main substation located at the centrallocation of utilitys substations; regional voltage standards

Aarons, G.

2008-01-01T23:59:59.000Z

95

International linear collider reference design report  

E-Print Network [OSTI]

magnet designs. Estimates of EDIA labor costs were basedthe materials, fabrication and EDIA labor fractions are wellThe fractional distribution of EDIA among several types of

Aarons, G.

2008-01-01T23:59:59.000Z

96

International linear collider reference design report  

E-Print Network [OSTI]

2.1-4 2.2-1 Electron Source SystemConsiderations 2.2 Electron Source . . . . . . . . . . . . .Electron Source . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Aarons, G.

2008-01-01T23:59:59.000Z

97

Twistor Spinoffs for Collider Physics  

SciTech Connect (OSTI)

Finding the adding up of Feynman diagrams tedious? Hidden symmetries found in the sums of diagrams suggest there is a better way to predict the results of particle collisions - in the past two years, spin-offs of a new theory, known as the Twistor String Theory, have led to the development of efficient alternatives to Feynman diagrams which can be useful for work at the Tevatron, the LHC and for future research at the International Linear Collider. Come see what this 'twistor' is all about!

Dixon, Lance

2005-12-19T23:59:59.000Z

98

Papers on Muon Colliders  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

Magnets for Muon Collider and Neutrino Storage Ring Magnets for Muon Collider and Neutrino Storage Ring (and Open Midplane Dipole for LARP): R. Gupta, et al., "High Field HTS Solenoid for a Muon Collider – Demonstrations, Challenges and Strategies, MT23, July 2013", presented at MT23, (talk) R. Weggel et al., "Open Midplane Dipoles for Muon Collider", 2011 Particle Accelerator Conference, New York (POSTER).. R. Gupta, M. Anerella, A. Ghosh, H. Kirk, R. Palmer, S. Plate, W. Sampson, Y. Shiroyanagi, P. Wanderer, B. Brandt, D. Cline, A. Garren, J. Kolonko, R. Scanlan, R. Weggel, "High field HTS R&D solenoid for muon collider", 2010 Applied Superconductivity Conference, Washington, DC, August 2010 >> Y. Shiroyanagi, W. Sampson, A. Ghosh, R. Gupta, "The Construction and

99

muon Collider Notes  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

Muon Collider Notes Muon Collider Notes MC-001 D. Neuffer, "Colliding Muon Beams at 90 GeV" Fermilab Note FN-319, July 1979. MC-002 D. Neuffer, "Principles and Applications of Muon Cooling" Proc. of the 12th International Conf. on High-Energy Accelerators, p. 481, 1983. MC-003 V.V. Parkhomchuk and A.N. Skrinsky, "Ionization Cooling: Physics and Applications" Proc. of the 12th International Conf. on High-Energy Accelerators, p. 485, 1983. MC-004 E.A. Perevedentsev and A.N. Skrinsky, "On the Proton Klystron" Proc. of the 12th International Conf. on High-Energy Accelerators, p. 508, 1983. MC-005 D. Neuffer, "Principles and Applications of Muon Cooling" Particle Accelerators, Vol. 14, p. 75, 1983. MC-006 D. Neuffer, "Multi-TeV Muon Colliders" Proc. of the Advanced

100

Towards a Muon Collider  

SciTech Connect (OSTI)

A multi TeV Muon Collider is required for the full coverage of Terascale physics. The physics potential for a Muon Collider at {approx}3 TeV and integrated luminosity of 1 ab{sup -1} is outstanding. Particularly strong cases can be made if the new physics is SUSY or new strong dynamics. Furthermore, a staged Muon Collider can provide a Neutrino Factory to fully disentangle neutrino physics. If a narrow s-channel resonance state exists in the multi-TeV region, the physics program at a Muon Collider could begin with less than 10{sup 31} cm{sup -2} s{sup -1} luminosity. Detailed studies of the physics case for a 1.5-4 TeV Muon Collider are just beginning. The goals of such studies are to: (1) identify benchmark physics processes; (2) study the physics dependence on beam parameters; (3) estimate detector backgrounds; and (4) compare the physics potential of a Muon Collider with those of the ILC, CLIC and upgrades to the LHC.

Eichten, E.; /Fermilab

2011-08-01T23:59:59.000Z

Note: This page contains sample records for the topic "level linear collider" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


101

Applying Effective Theories to Collider Phenomenology  

E-Print Network [OSTI]

Theories to Collider Phenomenology by Grigol GagikovichTheories to Collider Phenomenology Copyright 2010 by GrigolTheories to Collider Phenomenology by Grigol Gagikovich

Ovanesyan, Grigol

2010-01-01T23:59:59.000Z

102

The Muon Collider  

SciTech Connect (OSTI)

We describe the scientific motivation for a new type of accelerator, the muon collider. This accelerator would permit an energy-frontier scientific program and yet would fit on the site of an existing laboratory. Such a device is quite challenging, and requires a substantial R&D program. After describing the ingredients of the facility, the ongoing R&D activities of the Muon Accelerator Program are discussed. A possible U.S. scenario that could lead to a muon collider at Fermilab is briefly mentioned.

Zisman, Michael S

2010-05-17T23:59:59.000Z

103

Dark matter at colliders  

SciTech Connect (OSTI)

We show that colliders can impose strong constraints on dark matter. We take an effective field theory approach where dark matter couples to quarks and gluons through high dimensional operators. We discuss limits on interactions of dark matter and hadronic matter from the ATLAS experiment at the Large Hadron Collider (LHC). For spin-independent scattering, the LHC limits are stronger than those from direct detection experiments for light WIMPs. For spin-dependent scattering, the LHC sets better limits over much of parameter space.

Yu Haibo [Department of Physics, University of Michigan, Ann Arbor, MI, 48109 (United States)

2013-05-23T23:59:59.000Z

104

Hadron colliders (SSC/LHC)  

SciTech Connect (OSTI)

The nominal SSC and LHC designs should operate conservatively at luminosities up to 10{sup 33} cm{sup {minus}2} s{sup {minus}1}. This luminosity is dictated by the event rates that can be handled by the detectors. However, this limit is event dependent (e.g. it does not take much of a detector to detect the event pp {yields} elephant; all one needs is extremely high luminosity). As such, it is useful to explore the possibility of going beyond the 10{sup 33} cm{sup {minus}2} s{sup {minus}1} level. Such exploration will also improve the accelerator physics understanding of pp collider designs. If the detector limitations are removed, the first accelerator limits occur when the luminosity is at the level of 10{sup 34} cm{sup {minus}2}s{sup {minus}1}. These accelerator limits will first be reviewed. The authors will then continue on to explore even higher luminosity as the ultimate limit of pp colliders. Accelerator technologies needed to achieve this ultimate luminosity as well as the R and D needed to reach it are discussed.

Chao, A.W. [Superconducting Super Collider Lab., Dallas, TX (United States); Palmer, R.B. [Superconducting Super Collider Lab., Dallas, TX (United States); [Stanford Linear Accelerator Center, CA (United States); Evans, L.; Gareyte, J. [CERN, Geneva (Switzerland); Siemann, R.H. [Cornell Univ., Ithaca, NY (United States)

1992-12-31T23:59:59.000Z

105

The Large Hadron Collider  

Science Journals Connector (OSTI)

...fully from the space available in...the machine construction. The superconducting...for a single sector, the whole...therefore, as the heating increases...was made, a sector was powered...is a slight heating during ramp...Collider. | The construction of the Large...the limited space available in...

2012-01-01T23:59:59.000Z

106

Particle-in-cell simulation studies of the non-linear evolution of ultrarelativistic two-stream instabilities  

Science Journals Connector (OSTI)

......from inverse Compton scattering or thermal emissions (Ryde 2004, 2005) or...relativistic beams, such as those in Thode Sudan (1973). Colliding e + e beams have...growth in cold homogeneous plasma from thermal noise levels to non-linear saturation......

M. E. Dieckmann; P. K. Shukla; L. O. C. Drury

2006-04-11T23:59:59.000Z

107

Future Accelerators, Muon Colliders, and Neutrino Factories  

SciTech Connect (OSTI)

Particle physics is driven by five great topics. Neutrino oscillations and masses are now at the fore. The standard model with extensions to supersymmetry and a Higgs to generate mass explains much of the field. The origins of CP violation are not understood. The possibility of extra dimensions has raised tantalizing new questions. A fifth topic lurking in the background is the possibility of something totally different. Many of the questions raised by these topics require powerful new accelerators. It is not an overstatement to say that for some of the issues, the accelerator is almost the experiment. Indeed some of the questions require machines beyond our present capability. As this volume attests, there are parts of the particle physics program that have been significantly advanced without the use of accelerators such as the subject of neutrino oscillations and many aspects of the particle-cosmology interface. At this stage in the development of physics, both approaches are needed and important. This chapter first reviews the status of the great accelerator facilities now in operation or coming on within the decade. Next, midrange possibilities are discussed including linear colliders with the adjunct possibility of gamma-gamma colliders, muon colliders, with precursor neutrino factories, and very large hadron colliders. Finally visionary possibilities are considered including plasma and laser accelerators.

Richard A Carrigan, Jr.

2001-12-19T23:59:59.000Z

108

H and A Discrimination using Linear Polarization of Photons at the PLC  

E-Print Network [OSTI]

First realistic estimate of the usefulness of the Photon Linear Collider with linearly polarized photons as analyzer of the CP-parity of Higgs bosons is presented. MSSM Higgs bosons H and A with 300 GeV mass, for the model parameters corresponding to the so called "LHC wedge" region, are considered. When switching from circular to linear photon polarization a significant increase in heavy quark production background, which is no longer suppressed by helicity conservation, and decrease of the Higgs boson production cross sections by a factor of two is expected. Nevertheless, after three years of Photon Linear Collider running heavy scalar and pseudoscalar Higgs bosons in MSSM can be distinguished at a 4.5 sigma level.

A. F. Zarnecki; P. Niezurawski; M. Krawczyk

2007-10-20T23:59:59.000Z

109

Relativistic Heavy Ion Collider  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

Relativistic Heavy Ion Collider Relativistic Heavy Ion Collider managed for the U.S. Department of Energy by Brookhaven Science Associates, founded by Stony Brook University and Battelle. managed for the U.S. Department of Energy by Brookhaven Science Associates, a company founded by Stony Brook University and Battelle 07/07 Brookhaven National Laboratory Funded by the U.S. Department of Energy, Brookhaven National Laboratory is a multipurpose research institution located on a 5,300-acre site on Long Island, New York. Six Nobel Prize-winning discoveries have been made at Brookhaven Lab. The Laboratory operates large-scale scientific facilities and performs research in physics, chemistry, biology, medicine, applied science, and

110

Collider-Accelerator Department  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

RHIC Tunnel and Magnets RHIC Tunnel and Magnets RHIC Tunnel and Magnets AGS Tunnel and Magnets NSRL Beamline RF Kicker Snake 200-MeV LINAC AGS Cold Snake Magnet About the Collider-Accelerator Department The mission of the Collider-Accelerator Department is to develop, improve and operate the suite of particle / heavy ion accelerators used to carry out the program of accelerator-based experiments at BNL; to support the experimental program including design, construction and operation of the beam transports to the experiments plus support of detector and research needs of the experiments; to design and construct new accelerator facilities in support of the BNL and national missions. The C-A Department supports an international user community of over 1500 scientists. The department performs all these functions in an environmentally responsible and safe manner under a rigorous conduct of operations approach.

111

Muon Collider Progress: Accelerators  

SciTech Connect (OSTI)

A muon collider would be a powerful tool for exploring the energy-frontier with leptons, and would complement the studies now under way at the LHC. Such a device would offer several important benefits. Muons, like electrons, are point particles so the full center-of-mass energy is available for particle production. Moreover, on account of their higher mass, muons give rise to very little synchrotron radiation and produce very little beamstrahlung. The first feature permits the use of a circular collider that can make efficient use of the expensive rf system and whose footprint is compatible with an existing laboratory site. The second feature leads to a relatively narrow energy spread at the collision point. Designing an accelerator complex for a muon collider is a challenging task. Firstly, the muons are produced as a tertiary beam, so a high-power proton beam and a target that can withstand it are needed to provide the required luminosity of ~1 10{sup 34} cm{sup 2}s{sup 1}. Secondly, the beam is initially produced with a large 6D phase space, which necessitates a scheme for reducing the muon beam emittance (cooling). Finally, the muon has a short lifetime so all beam manipulations must be done very rapidly. The Muon Accelerator Program, led by Fermilab and including a number of U.S. national laboratories and universities, has undertaken design and R&D activities aimed toward the eventual construction of a muon collider. Design features of such a facility and the supporting R&D program are described.

Zisman, Michael S.

2011-09-10T23:59:59.000Z

112

muon_collider  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

muon_collider muon_collider muon_collider FridayMeetings MCTFmeetings MondayMeetings prstab texput.log #prstab.tex# last.kumac prstab.ps arxiv.tar.gz prstab.tar.gz referee_response_II.pdf prstab.pdf prstab.aux prstab.dvi prstab.end prstab.log prstab.tex prstab.tex~ accel-010307-f03.eps accel-010307-f28.eps old conclusions.tex higgsfact.tex introduction.tex mice.tex neufact.tex physics.tex prstab.tex r_and_d.tex authors_merged.tex buncher.tex temp.prt last.kumacold ringfig.eps MICE-fig.ps chgr_norm.ps chgr_merit.ps temp.csh temp.prt~ xupdn-a-model-view-iron5.eps site1-Layout1.eps rla2.eps phaserot.eps mole-hill.eps intoap.eps emit.eps cavity.eps allcount.eps MICE-88MHz-cooling.eps changes hh_ha_susy_rtsscan.eps letter_plots.eps scott33.eps scott32b.eps scott32a.eps MICE-200MHz-long.eps MICE-resolution.eps dipole_fields.eps

113

Identification of Sonographic B-Lines with Linear Transducer Predicts Elevated B-Type Natriuretic Peptide Level  

E-Print Network [OSTI]

ETUDES): sonographic B-lines and N-terminal pro-brain-typeIdentification of Sonographic B-lines with Linear Transducerof pleural-based B-lines seen by emergency department

Manson, William C; Bonz, Jay W; Carmody, Kristin; Osborne, Michael; Moore, Christopher L

2011-01-01T23:59:59.000Z

114

Muon colliders and neutrino factories  

SciTech Connect (OSTI)

Over the last decade there has been significant progress in developing the concepts and technologies needed to produce, capture and accelerate {Omicron}(10{sup 21}) muons/year. This development prepares the way for a new type of neutrino source (Neutrino Factory) and a new type of very high energy lepton-antilepton collider (Muon Collider). This article reviews the motivation, design and R&D for Neutrino Factories and Muon Colliders.

Geer, S.; /Fermilab

2010-09-01T23:59:59.000Z

115

Colliding neutrino beams  

E-Print Network [OSTI]

From several neutrino oscillation experiments, we understand now that neutrinos have mass. However, we really don't know what mechanism is responsible for producing this neutrino mass. Current or planned neutrino experiments utilize neutrino beams and long-baseline detectors to explore flavor mixing but do not address the question of the origin of neutrino mass. In order to answer that question, neutrino interactions need to be explored at much higher energies. This paper outlines a program to explore neutrinos and their interactions with various particles through a series of experiments involving colliding neutrino beams.

Reinhard Schwienhorst

2007-11-08T23:59:59.000Z

116

Colliding Nuclei at High Energy  

ScienceCinema (OSTI)

Physicist Peter Steinberg explains what happens when atomic nucleii travelling at close to the speed of light smash together in Brookhaven Lab's Relativistic Heavy Ion Collider (RHIC).

Brookhaven Lab

2010-01-08T23:59:59.000Z

117

RHIC | Relativistic Heavy Ion Collider  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

breakthrough accelerator could collide electrons with heavy ions or protons at nearly the speed of light to create "snapshots" of the force binding all visible matter. Accelerator...

118

Muon Collider Overview: Progress and Future Plans  

E-Print Network [OSTI]

NATIONAL LABORATORY Muon Collider Overview: Progress andCBP Note-263 BNL- 65627 Muon Collider Overview: Progress and9] 5 REFERENCES [1] Status of the Muon Collider Research and

Palmer, R.

2008-01-01T23:59:59.000Z

119

Muon Collider design status  

SciTech Connect (OSTI)

Muon Collider (MC) - proposed by G.I. Budker and A.N. Skrinsky a few decades ago - is now considered as the most exciting option for the energy frontier machine in the post-LHC era. A national Muon Accelerator Program (MAP) is being formed in the USA with the ultimate goal of building a MC at the Fermilab site with c.o.m. energy in the range 1.5-3 TeV and luminosity of {approx} 1.5 {center_dot} 10{sup 34} cm{sup -2} s{sup -1}. As the first step on the way to MC it envisages construction of a Neutrino Factory (NF) for high-precision neutrino experiments. The baseline scheme of the NF-MC complex is presented and possible options for its main components are discussed.

Alexahin, Y.; /Fermilab

2010-09-01T23:59:59.000Z

120

High Energy Colliders as Tools to Understand the Early Universe  

SciTech Connect (OSTI)

Cosmological observations have reached a new era of precision, and reveal many interesting and puzzling features of the Universe. I will briefly review two of the most exciting mysteries: the nature of the dark components of the Universe, and the origin of the asymmetry between matter and anti-matter. I will argue that our best hope of unraveling these questions will need to combine information from the heavens with measurements in the lab at high energy particle accelerators. The end of run II of the Tevatron, the up-coming Large Hadron Collider and proposed International Linear Collider all have great potential to help us answer these questions in the near future.

Tait, Tim (ANL) [ANL

2008-08-16T23:59:59.000Z

Note: This page contains sample records for the topic "level linear collider" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


121

Fermilab | Muon Collider | How Does a Muon Collider Work?  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

A muon collider complex would comprise several machines and many different A muon collider complex would comprise several machines and many different components. Scientists across the world are developing and testing them. View full graphic How Does a Muon Collider Work? A muon collider complex would comprise several machines and many different components. Scientists across the world are developing and testing them. Proton accelerator To create lots of muons, scientists use a high-intensity proton accelerator that steers protons into a target. The collisions create short-lived particles called pions. Within 50 meters the pions decay into muons and neutral particles called neutrinos. The muons have an energy of about 200 MeV. Capture cavities Magnets guide the muons into and through a set of radiofrequency cavities. The electric field inside the cavities increases the energy of slow muons

122

Hadron collider physics at UCR  

SciTech Connect (OSTI)

This paper describes the research work in high energy physics by the group at the University of California, Riverside. Work has been divided between hadron collider physics and e{sup +}-e{sup {minus}} collider physics, and theoretical work. The hadron effort has been heavily involved in the startup activities of the D-Zero detector, commissioning and ongoing redesign. The lepton collider work has included work on TPC/2{gamma} at PEP and the OPAL detector at LEP, as well as efforts on hadron machines.

Kernan, A.; Shen, B.C.

1997-07-01T23:59:59.000Z

123

EIS-0138: Superconducting Super Collider  

Broader source: Energy.gov [DOE]

The U.S. Department of Energy developed this EIS to analyze the potential environmental impacts of constructing the Superconducting Super Collider, a large proton accelerator, at each of seven alternative locations.

124

Stable massive particles at colliders  

SciTech Connect (OSTI)

We review the theoretical motivations and experimental status of searches for stable massive particles (SMPs) which could be sufficiently long-lived as to be directly detected at collider experiments. The discovery of such particles would address a number of important questions in modern physics including the origin and composition of dark matter in the universe and the unification of the fundamental forces. This review describes the techniques used in SMP-searches at collider experiments and the limits so far obtained on the production of SMPs which possess various colour, electric and magnetic charge quantum numbers. We also describe theoretical scenarios which predict SMPs, the phenomenology needed to model their production at colliders and interactions with matter. In addition, the interplay between collider searches and open questions in cosmology such as dark matter composition are addressed.

Fairbairn, M.; /Stockholm U.; Kraan, A.C.; /Pennsylvania U.; Milstead, D.A.; /Stockholm U.; Sjostrand, T.; /Lund U.; Skands, P.; /Fermilab; Sloan, T.; /Lancaster U.; ,

2006-11-01T23:59:59.000Z

125

RHIC | Electron-Ion Collider  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

particle accelerator could collide electrons with heavy ions or protons at nearly the speed of light to create rapid-fire, high-resolution "snapshots" of the force binding all...

126

NEUTRINO RADIATION CHALLENGES AND PROPOSED SOLUTIONS FOR MANY-TEV MUON COLLIDERS  

SciTech Connect (OSTI)

Neutrino radiation is expected to impose major design and siting constraints on many-TeV muon colliders. Previous predictions for radiation doses at TeV energy scales are briefly reviewed and then modified for extension to the many-TeV energy regime. The energy-cubed dependence of lower energy colliders is found to soften to an increase of slightly less than quadratic when averaged over the plane of the collider ring and slightly less than linear for the radiation hot spots downstream from straight sections in the collider ring. Despite this, the numerical values are judged to be sufficiently high that any many-TeV muon colliders will likely be constructed on large isolated sites specifically chosen to minimize or eliminate human exposure to the neutrino radiation. It is pointed out that such sites would be of an appropriate size scale to also house future proton-proton and electron-positron colliders at the high energy frontier, which naturally leads to conjecture on the possibilities for a new world laboratory for high energy physics. Radiation dose predictions are also presented for the speculative possibility of linear muon colliders. These have greatly reduced radiation constraints relative to circular muon colliders because radiation is only emitted in two pencil beams directed along the axes of the opposing linacs.

KING,B.J.

2000-05-05T23:59:59.000Z

127

RHIC | Relativistic Heavy Ion Collider  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

Relativistic Heavy Ion Collider Relativistic Heavy Ion Collider Photo of LINAC The Relativistic Heavy Ion Collider (RHIC) is a world-class particle accelerator at Brookhaven National Laboratory where physicists are exploring the most fundamental forces and properties of matter and the early universe. RHIC accelerates beams of particles (e.g., the nuclei of heavy atoms such as gold) to nearly the speed of light, and smashes them together to recreate a state of matter thought to have existed immediately after the Big Bang some 13.8 billion years ago. STAR and PHENIX, two large detectors located around the 2.4-mile-circumference accelerator, take "snapshots" of these collisions to reveal a glimpse of the basic constituents of visible matter, quarks and gluons. Understanding matter at

128

RHIC | Relativistic Heavy Ion Collider  

Broader source: All U.S. Department of Energy (DOE) Office Webpages

Brookhaven National Laboratory Brookhaven National Laboratory search U.S. Department of Energy logo Home RHIC Science News Images Videos For Scientists Björn Schenke 490th Brookhaven Lecture, 12/18 Join Björn Schenke of Brookhaven Lab's Physics Department for the 490th Brookhaven Lecture, titled 'The Shape and Flow of Heavy Ion Collisions,' on Wednesday, Dec. 18, at 4 p.m. in Berkner Hall. droplets Tiny Drops of Hot Quark Soup-How Small Can They Be? New analyses indicate that collisions of small particles with large gold nuclei at the Relativistic Heavy Ion Collider may be serving up miniscule servings of hot quark-gluon plasma. RHIC Physics RHIC is the first machine in the world capable of colliding ions as heavy as gold. The Spin Puzzle RHIC is the world's only machine capable of colliding beams of polarized

129

Linear Collider Final Focus Magnet Construction | Superconducting Magnet  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

Single Strand Superconductor Windings Single Strand Superconductor Windings Initial direct wind quad coils were constructed using 13 mil diameter single strand wire. This wire provides the smallest coil patterns possible, with quad coils wound easily onto .75 inch (19mm) diameter support tubes. The 13mil diameter superconductor gives the smallest coils possible, the penalty being higher inductance and smaller transfer function, but allowing lower operational currents. long model magnet Figure 1 shows the first one foot long model magnet constructed using the 11 axis ultrasonic wiring machine with 13 mil superconducting wire, the same wire previously used for the 472 RHIC Corrector packages. Existing stock materials were used in the construction, and the coil pattern was not optimized for harmonics, but to put as many coil turns onto the tube as

130

Linear Collider Final Focus Magnet Construction | Superconducting Magnet  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

Superconducting Cable Winding Tests Superconducting Cable Winding Tests To increase the transfer function, a 6 around 1 cable was next used. This cable is more efficient because it allows the packing of more conductor within the volume surrounding the support tube. This also lowers the inductance of the coil, making quench protection easier, but requires a higher operating current. Traded off is the minimum radius of curvature that can be tolerated by the bonding process as well as the insulation integrity. For this test, the first layer was designed for a length of 8 inches, and the second layer is 6 inches long. The lengths were chosen to allow inspection of the different features which were designed in. The pole spacers on the first layer for this test were chosen to be solid copper wire, instead of the standard G-10 spacer. The copper allows for a

131

Linear Collider Final Focus Magnet Construction | Superconducting Magnet  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

Two Layer Quadrupole Shielding Coil Two Layer Quadrupole Shielding Coil Near the interaction region if the ILC, the exit beam by design, is very close to the final focus quads, and is sensitive to the external field of the quads. To eliminate this effect and prevent disruption of the exiting beams, a two layer shielding quadrupole has been designed and wound. For simplicity as well as efficiency, the transfer function of this coilset has been designed to allow series connection of the focus quad with this outer shield coilset. The completed magnet will be finished with G-10 fillers, voltage taps and heaters will be added, blue epoxy filling for all interstitial spaces, and then the magnet will be wrapped with glass cloth and fiberglass roving, then cured. Once cured, this magnet will be capable of full power operation

132

Pulse Capacitors for Next Generation Linear Colliders. Final Report  

SciTech Connect (OSTI)

During this Phase I SBIR research program, Nanomaterials Research Corporation (NRC) successfully demonstrated high-voltage multilayer capacitors produced from sub-100 nm ceramic powders. The devices produced by NRC exhibited properties that make them particularly useful for pulse power applications. These properties include (1) high capacitance (2) low loss (3) high breakdown voltage (4) high insulation resistance and (5) rapid discharge characteristics. Furthermore, the properties of the nanostructured capacitors were consistently found to exceed those of components that represent the state of the art within the industry. Encouraged by these results, NRC is planning to submit a Phase II proposal with the objective of securing seed capital to continue this development effort.

Hooker, M.W.

2000-03-03T23:59:59.000Z

133

The MARX Modulator Development Program for the International Linear Collider  

SciTech Connect (OSTI)

The ILC Marx Modulator Development Program at SLAC is working towards developing a full-scale ILC Marx ''Reference Design'' modulator prototype, with the goal of significantly reducing the size and cost of the ILC modulator while improving overall modulator efficiency and availability. The ILC Reference Design prototype will provide a proof-of-concept model to industry in advance of Phase II SBIR funding, and also allow operation of the new 10MW L-Band Klystron prototypes immediately upon their arrival at SLAC.

Leyh, G.E.; /SLAC

2006-06-12T23:59:59.000Z

134

PERFORMANCE GOALS AND DESIGN CONSIDERATIONS FOR A LINEAR COLLIDER CALORIMETER  

E-Print Network [OSTI]

which provide sensitivity to physics far beyond its nominal energy reach. The detector has to match measurement for the process H? WW*. Together with the Higgs cross section in the WW fusion channel it provides with unprecedented jet energy resolution. This can be achieved within the so-called particle flow approach which puts

135

International Linear Collider Technical Design Report (Volumes 1 through 4)  

SciTech Connect (OSTI)

The design report consists of four volumes: Volume 1, Executive Summary; Volume 2, Physics; Volume 3, Accelerator (Part I, R and D in the Technical Design Phase, and Part II, Baseline Design); and Volume 4, Detectors.

Harrison M.

2013-03-27T23:59:59.000Z

136

Vibration Model Validation for Linear Collider Detector Platforms  

SciTech Connect (OSTI)

The ILC and CLIC reference designs incorporate reinforced-concrete platforms underneath the detectors so that the two detectors can each be moved onto and off of the beamline in a Push-Pull configuration. These platforms could potentially amplify ground vibrations, which would reduce luminosity. In this paper we compare vibration models to experimental data on reinforced concrete structures, estimate the impact on luminosity, and summarize implications for the design of a reinforced concrete platform for the ILC or CLIC detectors.

Bertsche, Kirk; Amann, J.W.; Markiewicz, T.W.; Oriunno, M.; Weidemann, A.; White, G.; /SLAC

2012-05-16T23:59:59.000Z

137

SLAC-R-1004 International Linear Collider Technical  

Office of Scientific and Technical Information (OSTI)

mass in supersymmetry, in which the loop corrections are proportional to (m t m W ) 4 . Care must be taken in relating the measured top quark mass to the value of the top quark...

138

SciTech Connect: International Linear Collider Technical Design...  

Office of Scientific and Technical Information (OSTI)

Physics (HEP) Country of Publication: United States Language: English Subject: Phenomenology-HEP,HEPPH Word Cloud More Like This Full Text preview image File size NAView Full...

139

Critical Issues and MUON Colliders - A Summary  

E-Print Network [OSTI]

Prospects for a High Energy Muon Collider Based On Electro-and understanding of high energy muon colliders, associatedyield of muons per electron, even at the optimum energy of

Chattopadhyay, S.

2008-01-01T23:59:59.000Z

140

Muon Colliders: The Next Frontier  

SciTech Connect (OSTI)

Muon Colliders provide a path to the energy frontier in particle physics but have been regarded to be "at least 20 years away" for 20 years. I will review recent progress in design studies and hardware R&D and show that a Muon Collider can be established as a real option for the post-LHC era if the current vigorous R&D effort revitalized by the Muon Collider Task Force at Fermilab can be supported to its conclusion. All critical technologies are being addressed and no show-stoppers have emerged. Detector backgrounds have been studied in detail and appear to be manageable and the physics can be done with existing detector technology. A muon facility can be built through a staged scenario starting from a low-energy muon source with unprecedented intensity for exquisite reach for rare processes, followed by a Neutrino Factory with ultrapure neutrino beams with unparalleled sensitivity for disentangling neutrino mixing, leading to an energy frontier Muon Collider with excellent energy resolution.

Yagmur Tourun

2009-07-29T23:59:59.000Z

Note: This page contains sample records for the topic "level linear collider" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


141

Exotic hadrons at hadron colliders  

E-Print Network [OSTI]

In this proceeding, an overview of the recent progress of the exotic hadrons studies at hadron colliders is presented, including the experimental measurement results from CMS, LHCb, CDF and D0. The talk covers the physics properties study of X(3872); the search for Y(4140) state etc; the recent result of Z(4430); and also the extended study to bottomonium sector.

Ye Chen

2014-09-01T23:59:59.000Z

142

Muon Colliders: The Next Frontier  

ScienceCinema (OSTI)

Muon Colliders provide a path to the energy frontier in particle physics but have been regarded to be "at least 20 years away" for 20 years. I will review recent progress in design studies and hardware R&D and show that a Muon Collider can be established as a real option for the post-LHC era if the current vigorous R&D effort revitalized by the Muon Collider Task Force at Fermilab can be supported to its conclusion. All critical technologies are being addressed and no show-stoppers have emerged. Detector backgrounds have been studied in detail and appear to be manageable and the physics can be done with existing detector technology. A muon facility can be built through a staged scenario starting from a low-energy muon source with unprecedented intensity for exquisite reach for rare processes, followed by a Neutrino Factory with ultrapure neutrino beams with unparalleled sensitivity for disentangling neutrino mixing, leading to an energy frontier Muon Collider with excellent energy resolution.

Yagmur Tourun

2010-01-08T23:59:59.000Z

143

From Neutrino Factory to Muon Collider  

SciTech Connect (OSTI)

Both Muon Colliders and Neutrino Factories require a muon source capable of producing and capturing {Omicron}(10{sup 21}) muons/year. This paper reviews the similarities and differences between Neutrino Factory and Muon Collider accelerator complexes, the ongoing R&D needed for a Muon Collider that goes beyond Neutrino Factory R&D, and some thoughts about how a Neutrino Factory on the CERN site might eventually be upgraded to a Muon Collider.

Geer, S.; /Fermilab

2010-01-01T23:59:59.000Z

144

Muon Collider Physics at Very High Energies  

E-Print Network [OSTI]

Muon colliders might greatly extend the energy frontier of collider physics. One can contemplate circular colliders with center-of-mass energies in excess of 10 TeV. Some physics issues that might be relevant at such a machine are discussed.

M. S. Berger

2000-01-03T23:59:59.000Z

145

Muon Muon Collider: Feasibility Study  

SciTech Connect (OSTI)

A feasibility study is presented of a 2 + 2 TeV muon collider with a luminosity of L = 10{sup 35} cm{sup -2}s{sup -1}. The resulting design is not optimized for performance, and certainly not for cost; however, it does suffice - we believe - to allow us to make a credible case, that a muon collider is a serious possibility for particle physics and, therefore, worthy of R and D support so that the reality of, and interest in, a muon collider can be better assayed. The goal of this support would be to completely assess the physics potential and to evaluate the cost and development of the necessary technology. The muon collider complex consists of components which first produce copious pions, then capture the pions and the resulting muons from their decay; this is followed by an ionization cooling channel to reduce the longitudinal and transverse emittance of the muon beam. The next stage is to accelerate the muons and, finally, inject them into a collider ring wich has a small beta function at the colliding point. This is the first attempt at a point design and it will require further study and optimization. Experimental work will be needed to verify the validity of diverse crucial elements in the design. Muons because of their large mass compared to an electron, do not produce significant synchrotron radiation. As a result there is negligible beamstrahlung and high energy collisions are not limited by this phenomena. In addition, muons can be accelerated in circular devices which will be considerably smaller than two full-energy linacs as required in an e{sup +} - e{sup -} collider. A hadron collider would require a CM energy 5 to 10 times higher than 4 TeV to have an equivalent energy reach. Since the accelerator size is limited by the strength of bending magnets, the hadron collider for the same physics reach would have to be much larger than the muon collider. In addition, muon collisions should be cleaner than hadron collisions. There are many detailed particle reactions which are open to a muon collider and the physics of such reactions - what one learns and the necessary luminosity to see interesting events - are described in detail. Most of the physics accesible to an e{sup +} - e{sup -} collider could be studied in a muon collider. In addition the production of Higgs bosons in the s-channel will allow the measurement of Higgs masses and total widths to high precision; likewise, t{bar t} and W{sup +}W{sup -} threshold studies would yield m{sub t} and m{sub w} to great accuracy. These reactions are at low center of mass energy (if the MSSM is correct) and the luminosity and {Delta}p/p of the beams required for these measurements is detailed in the Physics Chapter. On the other hand, at 2 + 2 TeV, a luminosity of L {approx} 10{sup 35} cm{sup -2}s{sup -1} is desirable for studies such as, the scattering of longitudinal W bosons or the production of heavy scalar particles. Not explored in this work, but worth noting, are the opportunities for muon-proton and muon-heavy ion collisions as well as the enormous richness of such a facility for fixed target physics provided by the intense beams of neutrinos, muons, pions, kaons, antiprotons and spallation neutrons. To see all the interesting physics described herein requires a careful study of the operation of a detector in the very large background. Three sources of background have been identified. The first is from any halo accompanying the muon beams in the collider ring. Very carefully prepared beams will have to be injected and maintained. The second is due to the fact that on average 35% of the muon energy appears in its decay electron. The energy of the electron subsequently is converted into EM showers either from the synchrotron radiation they emit in the collider magnetic field or from direct collision with the surrounding material. The decays that occur as the beams traverse the low beta insert are of particular concern for detector backgrounds. A third source of background is e{sup +} - e{sup -} pair creation from {mu}{sup +} - {mu}{sup -} interaction. Studies of

Gallardo, J.C.; Palmer, R.B.; /Brookhaven; Tollestrup, A.V.; /Fermilab; Sessler, A.M.; /LBL, Berkeley; Skrinsky, A.N.; /Novosibirsk, IYF; Ankenbrandt, C.; Geer, S.; Griffin, J.; Johnstone, C.; Lebrun, P.; McInturff, A.; Mills, Frederick E.; Mokhov, N.; Moretti, A.; Neuffer, D.; Ng, K.Y.; Noble, R.; Novitski, I.; Popovic, M.; Qian, C.; Van Ginneken, A. /Fermilab /Brookhaven /Wisconsin U., Madison /Tel Aviv U. /Indiana U. /UCLA /LBL, Berkeley /SLAC /Argonne /Sobolev IM, Novosibirsk /UC, Davis /Munich, Tech. U. /Virginia U. /KEK, Tsukuba /DESY /Novosibirsk, IYF /Jefferson Lab /Mississippi U. /SUNY, Stony Brook /MIT /Columbia U. /Fairfield U. /UC, Berkeley; ,

2012-04-05T23:59:59.000Z

146

Simulation of jets at colliders  

Science Journals Connector (OSTI)

Abstract We review the development of the physics behind event generators during the last decade. After a more general description of parton showers, we focus mostly on the perturbative side of the simulations. Two newer developments of parton showers, as implemented in herwig++, are described in greater detail. Matching and merging of parton showers with fixed order computations are discussed. We describe some developments of multiple partonic interactions which are relevant for the simulation of jets from the underlying event, where the implementation in herwig++ is again taken as a generic example. Finally, we compare some event generator results to collider data from LEP and the LHC.

Stefan Gieseke

2013-01-01T23:59:59.000Z

147

Probing Higgs Boson Interactions At Future Colliders.  

E-Print Network [OSTI]

??We present in this thesis a detailed analysis of Higgs boson interactions at future colliders. In particular we examine, in a model independent way, the (more)

Biswal, Sudhansu Sekhar

2009-01-01T23:59:59.000Z

148

Research and Development of Future Muon Collider  

SciTech Connect (OSTI)

Muon collider is a considerable candidate of the next generation high-energy lepton collider machine. A novel accelerator technology must be developed to overcome several intrinsic issues of muon acceleration. Recent research and development of critical beam elements for a muon accelerator, especially muon beam phase space ionization cooling channel, are reviewed in this paper.

Yonehara, K.; /Fermilab

2012-05-01T23:59:59.000Z

149

Linear Accelerator  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

Linear Accelerator (LINAC) The core of the LANSCE facility is one of the nation's most powerful proton linear accelerators or LINAC. The LINAC at LANSCE has served the nation since...

150

The Large Hadron Collider - At Discover's Horizon | Online Resources  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

Large Hadron Collider The Large Hadron Collider The U.S. at the Large Hadron Collider LHC: The Guide Theories tested LHC Experiments The ATLAS Experiment The CMS Experiment The...

151

Probing doubly charged Higgs bosons in e{sup +}e{sup -} colliders at the ILC and the CLIC in a 3-3-1 model  

SciTech Connect (OSTI)

The SU(3){sub L} x U(1){sub N} electroweak model predicts new Higgs bosons beyond the one of the standard model. In this work we investigate the signature and production of doubly charged Higgs bosons in the e{sup -}e{sup +} International Linear Collider and in the CERN Linear Collider. We compute the branching ratios for the doubly charged gauge bosons of the model.

Cieza Montalvo, J. E. [Instituto de Fisica, Universidade do Estado do Rio de Janeiro, Rua Sao Francisco Xavier 524, 20559-900 Rio de Janeiro, RJ (Brazil); Cortez, Nelson V. [Rua Justino Boschetti 40, 02205-050 Sao Paulo, SP (Brazil); Tonasse, M. D. [Unidade de Registro, Campus Experimental de Registro, Universidade Estadual Paulista, Rua Nelson Brihi Badur 430, 11900-000 Registro, SP (Brazil)

2008-12-01T23:59:59.000Z

152

Linear phase compressive filter  

DOE Patents [OSTI]

A phase linear filter for soliton suppression is in the form of a laddered series of stages of non-commensurate low pass filters with each low pass filter having a series coupled inductance (L) and a reverse biased, voltage dependent varactor diode, to ground which acts as a variable capacitance (C). L and C values are set to levels which correspond to a linear or conventional phase linear filter. Inductance is mapped directly from that of an equivalent nonlinear transmission line and capacitance is mapped from the linear case using a large signal equivalent of a nonlinear transmission line.

McEwan, Thomas E. (Livermore, CA)

1995-01-01T23:59:59.000Z

153

Instability of colliding metastable strings  

E-Print Network [OSTI]

The breaking of $U(1)_R$ symmetry plays a crucial role in modeling the breaking of supersymmetry (SUSY). In the models that possess both SUSY preserving and SUSY breaking vacua, tube-like cosmic strings called R-tubes, whose surfaces are constituted by domain walls interpolating a false and a true vacuum with some winding numbers, can exist. Their (in)stability can strongly constrain SUSY breaking models theirselves. In the present study, we investigate the dynamical (in)stability of two colliding metastable tube-like strings by field-theoretic simulations. From them, we find that the strings become unstable, depending on the relative collision angle and speed of two strings, and the false vacuum is eventually filled out by the true vacuum owing to rapid expansion of the strings or unstable bubbles created as remnants of the collision.

Takashi Hiramatsu; Minoru Eto; Kohei Kamada; Tatsuo Kobayashi; Yutaka Ookouchi

2013-04-02T23:59:59.000Z

154

Brilliant positron sources for CLIC and other collider projects  

E-Print Network [OSTI]

The CLIC (Compact Linear Collider), as future linear collider, requires an intense positron source. A brief history is given up to the present baseline configuration which assumes unpolarized beams. A conventional scheme, with a single tungsten target as source of e-e+ pairs, has been studied several years ago. But, in order to reduce the beam energy deposition on the e+ target converter, a double-target system has been studied and proposed as baseline for CLIC. With this hybrid target, the positron production scheme is based on the channeling process. A 5 GeV electron beam impinges on a thin crystal tungsten target aligned along its axis, enhancing the photon production by channeling radiation. A large number of photons are sent to a thick amorphous tungsten target, generating large number of e-e+ pairs, while the charged particles are bent away, reducing the deposited energy and the PEDD (Peak Energy Deposition Density). The targets parameters are optimized for the positron production. Polarize...

Rinolfi, Louis; Dadoun, Olivier; Kamitani, Takuya; Strakhovenko, Vladimir; Variola, Alessandro

2013-01-01T23:59:59.000Z

155

Collider constraints on interactions of dark energy with the Standard Model  

E-Print Network [OSTI]

We study models in which a light scalar dark energy particle couples to the gauge fields of the electroweak force, the photon, Z and W bosons. Our analysis applies to a large class of interacting dark energy models, including those in which the dark energy mass can be adjusted to evade fifth-force bounds by the so-called chameleon mechanism. We conclude that--with the usual choice of Higgs sector--electroweak precision observables are screened from the indirect effects of dark energy, making such corrections effectively unobservable at present-day colliders, and limiting the dark energy discovery potential of any future International Linear Collider. We show that a similar screening effect applies to processes mediated by flavour-changing neutral currents, which can be traced to the Glashow-Iliopoulos-Maiani mechanism. However, Higgs boson production at the Large Hadron Collider via weak boson fusion may receive observable corrections.

Philippe Brax; Clare Burrage; Anne-Christine Davis; David Seery; Amanda Weltman

2009-04-20T23:59:59.000Z

156

Comparison of photon colliders based on e-e- and e+e- beams  

E-Print Network [OSTI]

At photon colliders gamma-gamma, gamma-electron high energy photons are produced by Compton scattering of laser light off the high energy electrons (or positrons) at a linear collider. At first sight, photon colliders based on e-e- or e+e- primary beams have similar properties and therefore for convenience one can use e+e- beams both for e+e- and gamma-gamma modes of operation. Below we compare these options and show that e-e- beams are much better (mandatory) because in the e+e- case low energy background gamma-gamma to hadrons is much higher and e+e- annihilation reactions present a very serious background for gamma-gamma processes.

V. I. Telnov

2005-07-15T23:59:59.000Z

157

Director's colloquium March 18 large hadron collider  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

talk about the most complex scientific instrument ever built-the Large Hadron Collider (LHC). March 10, 2010 Los Alamos National Laboratory sits on top of a once-remote mesa in...

158

PHYSICS AT HIGH LUMINOSITY MUON COLLIDERS AND A FACILITY OVERVIEW.  

SciTech Connect (OSTI)

Physics potentials at future colliders including high luminosity {mu}{sup +}{mu}{sup -} colliders are discussed. Luminosity requirement, estimates for Muon collider energies of interest (0.1 TeV to 100 TeV) are calculated. Schematics and an overview of Muon Collider facility concept are also included.

PARSA,Z.

2001-07-01T23:59:59.000Z

159

ZZ production at hadron colliders in NNLO QCD  

E-Print Network [OSTI]

We report on the first calculation of next-to-next-to-leading order (NNLO) QCD corrections to the inclusive production of ZZ pairs at hadron colliders. Numerical results are presented for pp collisions with centre-of-mass energy ($\\sqrt{s}$) ranging from 7 to 14 TeV. The NNLO corrections increase the NLO result by an amount varying from $11\\%$ to $17\\%$ as $\\sqrt{s}$ goes from 7 to 14 TeV. The loop-induced gluon fusion contribution provides about $60\\%$ of the total NNLO effect. When going from NLO to NNLO the scale uncertainties do not decrease and remain at the $\\pm 3\\%$ level.

F. Cascioli; T. Gehrmann; M. Grazzini; S. Kallweit; P. Maierhfer; A. von Manteuffel; S. Pozzorini; D. Rathlev; L. Tancredi; E. Weihs

2014-05-09T23:59:59.000Z

160

ZZ production at hadron colliders in NNLO QCD  

E-Print Network [OSTI]

We report on the first calculation of next-to-next-to-leading order (NNLO) QCD corrections to the inclusive production of ZZ pairs at hadron colliders. Numerical results are presented for pp collisions with centre-of-mass energy ($\\sqrt{s}$) ranging from 7 to 14 TeV. The NNLO corrections increase the NLO result by an amount varying from $11\\%$ to $17\\%$ as $\\sqrt{s}$ goes from 7 to 14 TeV. The loop-induced gluon fusion contribution provides about $60\\%$ of the total NNLO effect. When going from NLO to NNLO the scale uncertainties do not decrease and remain at the $\\pm 3\\%$ level.

Cascioli, F; Grazzini, M; Kallweit, S; Maierhfer, P; von Manteuffel, A; Pozzorini, S; Rathlev, D; Tancredi, L; Weihs, E

2014-01-01T23:59:59.000Z

Note: This page contains sample records for the topic "level linear collider" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


161

North Linear Accelerator  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

North Linear Accelerator North Linear Accelerator Building Exterior Beam Enclosure Level Walk to the North Spreader North Recombiner Extras! North Linear Accelerator The North Linear Accelerator is one of the two long, straight sections of Jefferson Lab's accelerator. Electrons gain energy in this section by passing through acceleration cavities. There are 160 cavities in this straightaway, all lined up end to end. That's enough cavities to increase an electron's energy by 400 million volts each time it passes through this section. Electrons can pass though this section as many as five times! The cavities are powered by microwaves that travel down the skinny rectangular pipes from the service buildings above ground. Since the cavities won't work right unless they are kept very cold, they

162

Brookhaven and the Large Hadron Collider  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

Brookhaven & the Large Hadron Collider Brookhaven & the Large Hadron Collider Home News Brookhaven & ATLAS ATLAS ATLAS Calorimeter ATLAS Muon Spectrometer Construction Computing Upgrades RHIC & LHC Education LHC tunnel ATLAS detector ATLAS detector RACF BNL built superconducting magnets Brookhaven & the LHC The world's most powerful particle accelerator, the Large Hadron Collider (LHC) in Switzerland, powers unprecedented explorations of the deepest mysteries of the universe. In addition to serving as the U.S. host laboratory for the ATLAS experiment at the LHC, Brookhaven National Lab plays multiple roles in this international collaboration, from construction and project management to data storage and distribution. ATLAS rendering Brookhaven and ATLAS Brookhaven physicists and engineers are participating in one of the most

163

The Tevatron Hadron Collider: A short history  

SciTech Connect (OSTI)

The subject of this presentation was intended to cover the history of hadron colliders. However this broad topic is probably better left to historians. I will cover a much smaller portion of this subject and specialize my subject to the history of the Tevatron. As we will see, the Tevatron project is tightly entwined with the progress in collider technology. It occupies a unique place among accelerators in that it was the first to make use of superconducting magnets and indeed the basic design now forms a template for all machines using this technology. It was spawned in an incredibly productive era when new ideas were being generated almost monthly and it has matured into our highest energy collider complete with two large detectors that provide the major facility in the US for probing high Pt physics for the coming decade.

Tollestrup, A.V.

1994-11-01T23:59:59.000Z

164

The Quirky Collider Signals of Folded Supersymmetry  

SciTech Connect (OSTI)

We investigate the collider signals associated with scalar quirks ('squirks') in folded supersymmetric models. As opposed to regular superpartners in supersymmetric models these particles are uncolored, but are instead charged under a new confining group, leading to radically different collider signals. Due to the new strong dynamics, squirks that are pair produced do not hadronize separately, but rather form a highly excited bound state. The excited 'squirkonium' loses energy to radiation before annihilating back into Standard Model particles. We calculate the branching fractions into various channels for this process, which is prompt on collider time-scales. The most promising annihilation channel for discovery is W+photon which dominates for squirkonium near its ground state. We demonstrate the feasibility of the LHC search, showing that the mass peak is visible above the SM continuum background and estimate the discovery reach.

Burdman, Gustavo; Chacko, Z.; Goh, Hock-Seng; Harnik, Roni; Krenke, Christopher A.

2008-08-01T23:59:59.000Z

165

Fermilab | Muon Collider | Reports and Papers  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

Reports and Papers Reports and Papers Comprehensive Reports J. Gallardo, R. Palmer, A. Tollestrup, A. Sessler, A. Skrinsky et al., "μ+ μ- Collider: A Feasibility Study," DPF/DPB Summer Study on New Directions for High Energy Physics, Snow- mass, Colorado, 25 Jun - 12 Jul 1996, BNL - 52503, Fermilab - Conf - 96 - 092, LBNL - 38946, http://www.cap.bnl.gov/mumu/pubs/snowmass96.html C. Ankenbrandt et al.,"Status of muon collider research and development and future plans," Phys. Rev. ST Accel. Beams 2 (1999) 081001, http://prst-ab.aps.org/abstract/PRSTAB/v2/i8/e081001 M. M. Alsharo'a et al., "Recent progress in neutrino factory and muon collider research within the Muon Collaboration," Phys. Rev. ST Accel. Beams 6 (2003) 081001, http://prst-ab.aps.org/abstract/PRSTAB/v6/i8/e081001

166

Muon Collider: Plans, Progress and Challenges  

E-Print Network [OSTI]

We in the physics community expect the LHC to uncover new physics in the next few years. The character and energy scale of the new physics remain unclear, but it is likely that data from the LHC will need to be complemented by information from a lepton collider which can provide for precise examination of new phenomena. We describe the concept, accelerator design, and detector R&D for a high energy Muon Collider as well as the challenges associated with the machine and its detector environment.

Lipton, Ronald

2012-01-01T23:59:59.000Z

167

Top quark studies at hadron colliders  

SciTech Connect (OSTI)

The techniques used to study top quarks at hadron colliders are presented. The analyses that discovered the top quark are described, with emphasis on the techniques used to tag b quark jets in candidate events. The most recent measurements of top quark properties by the CDF and DO Collaborations are reviewed, including the top quark cross section, mass, branching fractions, and production properties. Future top quark studies at hadron colliders are discussed, and predictions for event yields and uncertainties in the measurements of top quark properties are presented.

Sinervo, P.K. [Univ. of Toronto, Ontario (Canada)

1997-01-01T23:59:59.000Z

168

From Neutrino Factory to Muon Collider  

SciTech Connect (OSTI)

After summarizing the important commonalities between neutrino factories and muon colliders, the key differences are discussed. These include a much larger needed cooling factor ({approx}10{sup 6} in six-dimensional emittance), a smaller number of muon bunches (perhaps only one of each charge), and acceleration to much higher energy, implying significantly different technical choices for some of the cooling and acceleration subsystems. The final storage rings are also quite different. Nevertheless, a neutrino factory could serve as a key stepping stone on the path to a muon collider.

Kaplan, Daniel M. [Illinois Institute of Technology, Chicago, IL 60616 (United States)

2011-10-06T23:59:59.000Z

169

PHYSICS WITH AND PHYSICS OF COLLIDING ELECTRON BEAMS  

E-Print Network [OSTI]

contributed so much to the physics of colliding beams, theyto reap so little from the physics with colliding beams.Conference on High-Energy Physics, Vienna" September 1968 (

Pellegrini, Claudio

2008-01-01T23:59:59.000Z

170

Review of heavy ion collider proposals  

SciTech Connect (OSTI)

In this paper we review proposals for heavy-ion colliders generated during the last few years for several national laboratories. The proposals span over a large range of energy and luminosity to accommodate the experimental needs of both the nuclear and the high-energy physicists. We report also briefly efforts in the same field happening in Europe.

Ruggiero, A.G.

1985-01-01T23:59:59.000Z

171

Genesis of the Large Hadron Collider  

Science Journals Connector (OSTI)

...and beyond the discovery of the Higgs boson. organised and edited by John...and beyond the discovery of the Higgs boson . This paper describes the scientific...projects. Large Hadron Collider|Higgs boson|CERN| 1. Beginnings and background...

2015-01-01T23:59:59.000Z

172

From the LHC to Future Colliders  

SciTech Connect (OSTI)

Discoveries at the LHC will soon set the physics agenda for future colliders. This report of a CERN Theory Institute includes the summaries of Working Groups that reviewed the physics goals and prospects of LHC running with 10 to 300 fb{sup -1} of integrated luminosity, of the proposed sLHC luminosity upgrade, of the ILC, of CLIC, of the LHeC and of a muon collider. The four Working Groups considered possible scenarios for the first 10 fb{sup -1} of data at the LHC in which (i) a state with properties that are compatible with a Higgs boson is discovered, (ii) no such state is discovered either because the Higgs properties are such that it is difficult to detect or because no Higgs boson exists, (iii) a missing-energy signal beyond the Standard Model is discovered as in some supersymmetric models, and (iv) some other exotic signature of new physics is discovered. In the contexts of these scenarios, theWorking Groups reviewed the capabilities of the future colliders to study in more detail whatever new physics may be discovered by the LHC. Their reports provide the particle physics community with some tools for reviewing the scientific priorities for future colliders after the LHC produces its first harvest of new physics from multi-TeV collisions.

De Roeck, A.; Ellis, J.; /CERN; Grojean, C.; Heinemeyer, S.; /Cantabria Inst. of Phys.; Jakobs, K.; /Freiburg U.; Weiglein, G.; /Durham U., IPPP; Azuelos, G.; /TRIUMF; Dawson, S.; /Brookhaven; Gripaios, B.; /CERN; Han, T.; /Wisconsin U., Madison; Hewett, J.; /SLAC; Lancaster, M.; /University Coll. London; Mariotti, C.; /INFN, Turin; Moortgat, F.; /Zurich, ETH; Moortgat-Pick, G.; /Durham U., IPPP; Polesello, G.; /INFN, Pavia; Riemann, S.; /DESY; Assamagan, K.; /Brookhaven; Bechtle, P.; /DESY; Carena, M.; /Fermilab; Chachamis, G.; /PSI, Villigen /Taiwan, Natl. Taiwan U. /INFN, Florence /Bonn U. /CERN /Bonn U. /Freiburg U. /Oxford U. /Louvain U., CP3 /Bangalore, Indian Inst. Sci. /INFN, Milan Bicocca /Munich, Max Planck Inst. /Taiwan, Natl. Taiwan U. /Frascati /Fermilab /Warsaw U. /Florida U. /Orsay, LAL /LPSC, Grenoble /Warsaw U. /Yale U. /Stockholm U., Math. Dept. /Durham U., IPPP /DESY /Rome U. /University Coll. London /UC, San Diego /Heidelberg U. /Florida State U. /SLAC /Durham U., IPPP /Southern Denmark U., CP3-Origins /McGill U. /Durham U., IPPP; /more authors.; ,

2010-06-11T23:59:59.000Z

173

Phenomenology of the minimal B ? L Model: the Higgs sector at the Large Hadron Collider and future linear colliders.  

E-Print Network [OSTI]

??This thesis is devoted to the study of the phenomenology of the Higgs sector of the minimal B ?L extension of the Standard Model at (more)

Pruna, Giovanni Marco

2011-01-01T23:59:59.000Z

174

Obtaining slow beam spills at the SSC collider  

SciTech Connect (OSTI)

There is substantial interest in providing slow-spill external proton beams in parallel with ``interaction running`` at the 20 TeV SSC collider. The proposal is to cause a flux of particles to impinge on a target consisting of a bent crystal extraction channel. Additionally, a slow spill onto a conventional internal target could be used as a source of secondary beams for physics or test purposes and might also be used for B-physics as proposed for HERA. The ``natural`` beam loss rates from elastic and diffractive beam gas scattering and IP collisions are not sufficient to provide suitably intense external proton beams. To prevent loss of luminosity, the rf excitation is non-linear and preferentially blows up the halo of the beam. The ``target`` is to be located at a region of high dispersion forcing particles at the edge of the momentum space onto the target. T. Lohse in this workshop has described a proposed internal target to be used at HERA that will not employ rf excitation but will use the finite loss rates observed at the HERA machine. The Hera losses are caused by a variety of sources in addition to beam gas scattering or IP interactions. Initially, the beam lifetime at HERA was too short to obtain satisfactory integrated luminosities. Subsequently, through careful attention to detail, the beam lifetime was increased to > 20 hours. Even with these changes, present loss rates provide the required intensity onto an internal target. The Tevatron and SPS proton anti-proton colliders have had similar experiences with their investigations of loss rates and also find that beam lifetimes may be substantially shorter than expected solely from beam gas and IP interactions. This paper proposes deliberately introducing controlled errors li

Ritson, D.

1993-08-01T23:59:59.000Z

175

Future high energy colliders symposium. Summary report  

SciTech Connect (OSTI)

A `Future High Energy Colliders` Symposium was held October 21-25, 1996 at the Institute for Theoretical Physics (ITP) in Santa Barbara. This was one of the 3 symposia hosted by the ITP and supported by its sponsor, the National Science Foundation, as part of a 5 month program on `New Ideas for Particle Accelerators`. The long term program and symposia were organized and coordinated by Dr. Zohreh Parsa of Brookhaven National Laboratory/ITP. The purpose of the symposium was to discuss the future direction of high energy physics by bringing together leaders from the theoretical, experimental and accelerator physics communities. Their talks provided personal perspectives on the physics objectives and the technology demands of future high energy colliders. Collectively, they formed a vision for where the field should be heading and how it might best reach its objectives.

Parsa, Z. [Univ. of California, Santa Barbara, CA (United States). Institute for Theoretical Physics]|[Brookhaven National Lab., Upton, CA (United States)

1996-12-31T23:59:59.000Z

176

Fermilab collider run 1b accelerator performance  

SciTech Connect (OSTI)

This report summarizes the performance of Run 1b as of the end of July 1995. This run is the conclusion of Fermilab Collider Run 1, which consists of Run 1a (May 1992 - May 1993) and Run 1b (January 1994 - February 1996). Run 1b is characterized by being the first with the new 400 MeV Linac. At this time the run is not complete. Colliding beam physics is scheduled to resume after the summer 1995 shut down and continue until mid-February 1996. All of the operation to date is at a Tevatron energy of 900 GeV. This report emphasizes performance numbers and the various improvements made to systems to achieve this performance. It will only discuss the underlying physics to a limited extent. The report is divided into sections on: run statistics, I&C issues, proton source performance, antiproton source performance, main ring performance, Tevatron performance, and a summary.

Bharadwaj, V.; Halling, M.; Lucas, P.; McCrory, E.; Mishra, S.; Pruss, S.; Werkema, S.

1996-04-01T23:59:59.000Z

177

The Design of a Large Booster Ring for the Medium Energy Electron-Ion Collider at Jlab  

SciTech Connect (OSTI)

In this paper, we present the current design of the large booster ring for the Medium energy Electron-Ion Collider at Jefferson Lab. The booster ring takes 3 GeV protons or ions of equivalent rigidity from a pre-booster ring, and accelerates them to 20 GeV for protons or equivalent energy for light to heavy ions before sending them to the ion collider ring. The present design calls for a figure-8 shape of the ring for superior preservation of ion polarization. The ring is made of warm magnets and shares a tunnel with the two collider rings. Acceleration is achieved by warm RF systems. The linear optics has been designed with the transition energy above the highest beam energy in the ring so crossing of transition energy will be avoided. Preliminary beam dynamics studies including chromaticity compensation are presented in this paper.

Edward Nissen, Todd Satogata, Yuhong Zhang

2012-07-01T23:59:59.000Z

178

arXiv:hep-ph/961238817Dec1996 Signals from Flavor Changing Scalar Currents at the Future Colliders  

E-Print Network [OSTI]

arXiv:hep-ph/961238817Dec1996 Signals from Flavor Changing Scalar Currents at the Future Colliders Neutral Cur- rents arising at the tree level. The existing constraints mainly affect the couplings (2HDM) with Flavor Changing Neu- tral Currents (FCNC's) allowed at the tree level [1]-[3]. This Model

Thomas Jefferson National Accelerator Facility

179

Electron Ion Collider: The Next QCD Frontier  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

Ion Collider: Ion Collider: The Next QCD Frontier Understanding the glue that binds us all Electron Ion Collider: The Next QCD Frontier Understanding the glue that binds us all BNL-98815-2012-JA JLAB-PHY-12-1652 arXiv:1212.1701 Authors A. Accardi 14,28 , J. L. Albacete 16 , M. Anselmino 29 , N. Armesto 36 , E. C. Aschenauer 3,† , A. Bacchetta 35 , D. Boer 33 , W. Brooks 37,† , T. Burton 3 , N.-B. Chang 23 , W.-T. Deng 13,23 , A. Deshpande 25,∗,† , M. Diehl 11,† , A. Dumitru 2 , R. Dupr´ e 7 , R. Ent 28,‡ , S. Fazio 3 , H. Gao 12,† , V. Guzey 28 , H. Hakobyan 37 , Y. Hao 3 , D. Hasch 15 , R. Holt 1,† , T. Horn 5,† , M. Huang 23 , A. Hutton 28,† , C. Hyde 20 , J. Jalilian-Marian 2 , S. Klein 17 , B. Kopeliovich 37 , Y. Kovchegov 19,† , K. Kumar 24,† , K. Kumeriˇ cki 40 , M. A. C. Lamont 3 , T. Lappi 34 , J.-H. Lee 3 , Y. Lee 3 , E. M. Levin 26,37 , F.-L. Lin 28 , V. Litvinenko 3 , T. W. Ludlam 3,‡ , C. Marquet

180

Muon Collider Machine-Detector Interface  

SciTech Connect (OSTI)

In order to realize the high physics potential of a Muon Collider (MC) a high luminosity of {mu}{sup +}{mu}{sup -}-collisions at the Interaction Point (IP) in the TeV range must be achieved ({approx}10{sup 34} cm{sup -2}s{sup -1}). To reach this goal, a number of demanding requirements on the collider optics and the IR hardware - arising from the short muon lifetime and from relatively large values of the transverse emittance and momentum spread in muon beams that can realistically be obtained with ionization cooling should be satisfied. These requirements are aggravated by limitations on the quadrupole gradients as well as by the necessity to protect superconducting magnets and collider detectors from muon decay products. The overall detector performance in this domain is strongly dependent on the background particle rates in various sub-detectors. The deleterious effects of the background and radiation environment produced by the beam in the ring are very important issues in the Interaction Region (IR), detector and Machine-Detector Interface (MDI) designs. This report is based on studies presented very recently.

Mokhov, Nikolai V.; /Fermilab

2011-08-01T23:59:59.000Z

Note: This page contains sample records for the topic "level linear collider" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


181

Directional muon jet chamber for a muon collider (Groovy Chamber)  

SciTech Connect (OSTI)

A directional jet drift chamber with PAD readout is proposed here which can select vertex originated muons within a given time window and eliminate those muons which primarily originate upstream, using only a PAD readout. Drift time provides the Z-coordinate, and the center of gravity of charge distribution provides the r-{psi} coordinates. Directionality at the trigger level is obtained by the timing measurement from the PAD hits within a given time window. Because of the long drift time between the bunch crossings, a muon collider enables one to choose a drift distance in the drift chamber as long as 50 cm. This is an important factor in reducing cost of drift chambers which have to cover relatively large areas.

Atac, M. [Fermi National Accelerator Lab., Batavia, IL (United States)]|[Univ. of California, Los Angeles, CA (United States)

1996-10-01T23:59:59.000Z

182

Gluon Fusion Contribution to $VHj$ Production at Hadron Colliders  

E-Print Network [OSTI]

We study the associated production of an electroweak vector boson and the Higgs boson with a jet via gluon-gluon fusion. At the leading order, these processes occur at one-loop level. The amplitudes of these one-loop processes are gauge invariant and finite. Therefore, their contributions towards the corresponding hadronic cross sections and kinematic distributions can be calculated separately. We present results for the Large Hadron Collider and its discussed upgrades. We find that the gluon-gluon one-loop process gives dominant contribution to the $\\gamma H j$ production. We observe a destructive interference effect in the $gg\\to Z H j$ amplitude. We also find that in the high transverse momentum and central rapidity region, the $ZHj$ production cross section via gluon-gluon fusion becomes comparable to the cross section contributions coming from quark-quark and quark-gluon channels.

Agrawal, Pankaj

2014-01-01T23:59:59.000Z

183

Reducing backgrounds in the higgs factory muon collider detector  

SciTech Connect (OSTI)

A preliminary design of the 125-GeV Higgs Factory (HF) Muon Collider (MC) has identified an enormous background loads on the HF detector. This is related to the twelve times higher muon decay probability at HF compared to that previously studied for the 1.5-TeV MC. As a result of MARS15 optimization studies, it is shown that with a carefully designed protection system in the interaction region, in the machine-detector interface and inside the detector one can reduce the background rates to a manageable level similar to that achieved for the optimized 1.5-TeV case. The main characteristics of the HF detector background are presented for the configuration found.

Mokhov, N. V.; Tropin, I. S.

2014-06-01T23:59:59.000Z

184

B Physics Theory for Hadron Colliders  

E-Print Network [OSTI]

A short overview of theoretical methods for B physics at hadron colliders is presented. The main emphasis is on the theory of two-body hadronic B decays, which provide a rich field of investigation in particular for the Tevatron and the LHC. The subject holds both interesting theoretical challenges as well as many opportunities for flavor studies and new physics tests. A brief review of the current status and recent developments is given. A few additional topics in B physics are also mentioned.

G. Buchalla

2008-09-03T23:59:59.000Z

185

Future high energy colliders. Formal report  

SciTech Connect (OSTI)

This Report includes copies of transparencies and notes from the presentations made at the Symposium on Future High Energy Colliders, October 21-25, 1996 at the Institute for Theoretical Physics, University of California, Santa Barbara California, that was made available by the authors. Editing, reduction and changes to the authors contributions were made only to fulfill the printing and publication requirements. We would like to take this opportunity and thank the speakers for their informative presentations and for providing copies of their transparencies and notes for inclusion in this Report.

Parsa, Z. [ed.] [ed.

1996-12-31T23:59:59.000Z

186

Two Complementary Strategies for New Physics Searches at Lepton Colliders  

SciTech Connect (OSTI)

In this thesis I present two complementary strategies for probing beyond-the-Standard Model physics using data collected in e{sup +}e{sup -} collisions at lepton colliders. One strategy involves searching for effects at low energy mediated by new particles at the TeV mass scale, at which new physics is expected to manifest. Several new physics scenarios, including Supersymmetry and models with leptoquarks or compositeness, may lead to observable rates for charged lepton-flavor violating processes, which are forbidden in the Standard Model. I present a search for lepton-flavor violating decays of the {Upsilon}(3S) using data collected with the BABAR detector. This study establishes the 90% confidence level upper limits BF({Upsilon}(3S) {yields} e{tau}) < 5.0 x 10{sup -6} and BF({Upsilon}(3S) {yields} {mu}{tau}) < 4.1 x 10{sup -6} which are used to place constraints on new physics contributing to lepton-flavor violation at the TeV mass scale. An alternative strategy is to increase the collision energy above the threshold for new particles and produce them directly. I discuss research and development efforts aimed at producing a vertex tracker which achieves the physics performance required of a high energy lepton collider. A small-scale vertex tracker prototype is constructed using Silicon sensors of 50 {mu}m thickness and tested using charged particle beams. This tracker achieves the targeted impact parameter resolution of {sigma}{sub LP} = (5{circle_plus}10 GeV/p{sub T}) as well as a longitudinal vertex resolution of (260 {+-} 10) {mu}m, which is consistent with the requirements of a TeV-scale lepton collider. This detector research and development effort must be motivated and directed by simulation studies of physics processes. Investigation of a dark matter-motivated Supersymmetry scenario is presented, in which the dark matter is composed of Supersymmetric neutralinos. In this scenario, studies of the e{sup +}e{sup -} {yields} H{sup 0}A{sup 0} production process allow for precise measurements of the properties of the A{sup 0} Supersymmetric Higgs boson, which improve the achievable precision on the neutralino dark matter candidate relic density to 8%. Comparison between this quantity and the dark matter density determined from cosmological observations will further our understanding of dark matter by allowing us to determine if it is of Supersymmetric origin.

Hooberman, Benjamin Henry; /SLAC

2009-07-06T23:59:59.000Z

187

RHIC | Physics of the Relativistic Heavy Ion Collider  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

The Physics of RHIC Physicists from around the world are using the Relativistic Heavy Ion Collider to explore some of Nature's most basic -- and intriguing -- ingredients and...

188

QCD Factorization for heavy quarkonium production at collider energies  

E-Print Network [OSTI]

In this talk, I briefly review several models of the heavy quarkonium production at collider energies, and discuss the status of QCD factorization for these production models.

Jian-Wei Qiu

2006-10-31T23:59:59.000Z

189

Muon-Muon and Other High Energy Colliders  

Science Journals Connector (OSTI)

Before we discuss the muon collider in detail, it is useful to...(pp, $$p\\bar p$$ ), of lepton (e + e ...

R. B. Palmer; J. C. Gallardo

1997-01-01T23:59:59.000Z

190

Far Future Colliders and Required R&D Program  

SciTech Connect (OSTI)

Particle colliders for high energy physics have been in the forefront of scientific discoveries for more than half a century. The accelerator technology of the collider has progressed immensely, while the beam energy, luminosity, facility size and the cost have grown by several orders of magnitude. The method of colliding beams has not fully exhausted its potential but its pace of progress has greatly slowed down. In this paper we very briefly review the R&D toward near future colliders and make an attempt to look beyond the current horizon and outline the changes in the paradigm required for the next breakthroughs.

Shiltsev, V.; /Fermilab

2012-06-01T23:59:59.000Z

191

The Very Large Hadron Collider: The farthest energy frontier  

SciTech Connect (OSTI)

The Very Large Hadron Collider (or Eloisatron) represents what may well be the final step on the energy frontier of accelerator-based high energy physics. While an extremely high luminosity proton collider at 100-200 TeV center of mass energy can probably be built in one step with LHC technology, that machine would cost more than what is presently politically acceptable. This talk summarizes the strategies of collider design including staged deployment, comparison with electron-positron colliders, opportunities for major innovation, and the technical challenges of reducing costs to manageable proportions. It also presents the priorities for relevant R and D for the next few years.

Barletta, William A.

2001-06-21T23:59:59.000Z

192

Muon Colliders: New Prospects for Precision Physics and the High Energy Frontier  

E-Print Network [OSTI]

An overview is given of muon collider technology and of the current status of the muon collider research program. The exciting potential of muon colliders for both neutrino physics and collider physics studies is then described and illustrated using self-consistent collider parameter sets at 0.1 TeV to 100 TeV center-of-mass energies.

Bruce J. King

1999-08-08T23:59:59.000Z

193

Trilepton Higgs boson signal at hadron colliders  

Science Journals Connector (OSTI)

Most Higgs boson searches pursued at hadron colliders require Yukawa interactions either in the production or the decay of a Higgs boson. We propose a trilepton Higgs boson search based only upon the gauge interactions of the Higgs boson. This strategy can be utilized successfully for the standard model (SM) Higgs boson as well as nonstandard Higgs bosons which break electroweak symmetry but have little to do with fermion mass generation. The trileptons come from Wh production followed by Wh?WWW(*)?3l decays. A SM Higgs trilepton signal would be difficult to detect at the Fermilab Tevatron collider: with 100 fb-1 of data, only a 3? signal above background can be achieved after cuts if 140 GeVHiggs boson mass in the range 140185 (125200) GeV. Prospects for a trilepton Higgs boson discovery are greatly improved for models with nonstandard Higgs boson sectors where a Higgs boson couples preferentially to vector bosons rather than to fermions.

Howard Baer and James D. Wells

1998-04-01T23:59:59.000Z

194

Search for the Standard Model Higgs Boson at the LEP2 Collider near  

E-Print Network [OSTI]

Search for the Standard Model Higgs Boson at the LEP2 Collider near ps = 183 GeV The ALEPHV. These data are used to look for possible signals from the production of the Standard Model Higgs boson on the mass of the Higgs boson: mH > 87:9 GeV=c2 at 95% con#12;dence level. The ALEPH Collaboration wish

Boyer, Edmond

195

Lepton-Flavor Violation in the Left-handed Slepton Production at Future Lepton Colliders  

E-Print Network [OSTI]

The Super-Kamiokande atmospheric neutrino data suggest existence of the large lepton-flavor violating (LFV) interaction in the higher energy scale. If the minimal supersymmetric standard model is extended to have right-handed neutrinos, the left-handed sleptons in the second and third generations are expected to have the LFV masses in the minimal supergravity scenario. In this article we study the LFV signals in the left-handed slepton production at $\\mu^+\\mu^-$ colliders and $\\e^+\\e^-$ linear colliders (LC's), $\\mu^+\\mu^-(\\e^+\\e^-)\\to\\tau\\mu +4jets + \\E$ and $\\mu^+\\mu^-(\\e^+\\e^-)\\to\\tau\\mu l+ 2jets+ \\E$. The main background comes from decay of a tau lepton into a muon in the lepton-flavor conserving slepton pair production. They are significantly reduced by the energy and the impact parameter cuts for the muon. At $\\mu^+\\mu^-$ colliders (LC's) it may be possible to reach the mixing angle $\\sin 2\\theta_{\\tilde{\

Junji Hisano; Mihoko M. Nojiri; Yasuhiro Shimizu; Minoru Tanaka

1998-08-25T23:59:59.000Z

196

Detectors for Neutrino Physics at the First Muon Collider  

E-Print Network [OSTI]

We consider possible detector designs for short-baseline neutrino experiments using neutrino beams produced at the First Muon Collider complex. The high fluxes available at the muon collider make possible high statistics deep-inelastic scattering neutrino experiments with a low-mass target. A design of a low-energy neutrino oscillation experiment on the ``tabletop'' scale is also discussed.

Deborah A. Harris; Kevin S. McFarland

1998-04-20T23:59:59.000Z

197

Muon Front End for a Neutrino Factory and Muon Collider  

E-Print Network [OSTI]

Muon Front End for a Neutrino Factory and Muon Collider Chris Rogers, ASTeC, Rutherford Appleton Laboratory 15th January 2013 #12;High Energy Muon Facilities Growing interest in large, high energy muon facilities Neutrino Factory -> neutrino oscillations and Muon Collider -> energy frontier or Higgs factory

McDonald, Kirk

198

EIS-0138-S: Superconducting Super Collider, Supplemental, Waxahatchie, Texas  

Broader source: Energy.gov [DOE]

The U.S. Department of Energy developed this supplementary statement to analyze the environmental impacts of design modifications to the Superconducting Super Collider that were made following the publication of the Record of Decision that selected Ellis County, Texas, as the location of the laboratory facility. This statement supplements DOE/EIS-0138, Superconducting Super Collider.

199

Energy Content of Colliding Plane Waves using Approximate Noether Symmetries  

E-Print Network [OSTI]

This paper is devoted to study the energy content of colliding plane waves using approximate Noether symmetries. For this purpose, we use approximate Lie symmetry method of Lagrangian for differential equations. We formulate the first-order perturbed Lagrangian for colliding plane electromagnetic and gravitational waves. It is shown that in both cases, there does not exist

M. Sharif; Saira Waheed

2011-09-19T23:59:59.000Z

200

A New Class of RC4 Colliding Key Pairs with Greater Hamming Distance  

Science Journals Connector (OSTI)

In this paper, we discovered a new class of colliding key pairs of RC4, namely ... discovery of RC4 colliding keys with hamming distance greater than one, that is, the colliding ... the probability of the existen...

Jiageng Chen; Atsuko Miyaji

2010-01-01T23:59:59.000Z

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While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


201

Superconducting Magnet Technology for Future Hadron Colliders  

SciTech Connect (OSTI)

The application of superconducting magnets to large-scale particle accelerators was successfully demonstrated with the completion of the Tevatron at Fermilab in 1983. This machine, utilizing dipole magnets operating at 4.5 T, has been operating successfully for the past 12 years. This success was followed a few years later by HERA, an electron-proton collider that uses superconducting quadrupoles and dipoles of a design similar to those in the Tevatron. The next major project was the ill-fated SSC, which was cancelled in 1993. However, the SSC R&D effort did succeed in demonstrating the reliable operation of dipole magnets up to 6.6 T. The LHC, now under construction, pushes the ductile superconductor, NbTi, to its limit in dipoles designed to operate at fields of 8.6 T at 1.8 K. Several recent studies have addressed the issues involved in taking the next step beyond the LHC. The Division of Particles and Fields Workshop on Future Hadron Facilities in the U.S., held at Indiana U. in 1994, examined two possible facilities--a 2-TeV on 2-TeV collider and a 30-Tev on 30-Tev collider. The participants arrived at the following conclusions with regard to superconducting magnets: (1) Superconducting magnets are the enabling technology for high energy colliders. As such, the highest priority for the future of hadron facilities in the U.S. is the reassembly of a U.S. superconducting magnet R&D program. (2) emphasis on conductor development and new magnet designs; and (3) goals of such a program might be (a) the development of a 9-10 Tesla magnet based on NbTi technology; (b) the development of high quality quadrupoles with gradients in the range 250-300 T/m; and (c) initiation of R&D activities aimed at moving beyond the existing technology as appears to be required for the development of a magnet operating at 12-15 Tesla. In order to reach fields above 10 T, magnet designers must turn to new materials with higher critical fields than that of NbTi. Several candidate conductors exist; unfortunately, all of these new materials are brittle, and thus pose new challenges to the magnet designers. At the same time that the forces on the magnet windings are increasing due to the higher Lorentz force associated with the higher magnetic fields, the conductor tensile strain must be limited to less than about 0.5% to prevent damage to the brittle superconducting material. Also, coil fabrication methods must be changed. If the superconductor is in the reacted, or brittle, state, the coil winding procedure must be modified to prevent overstraining. If the alternative wind and react approach is used, new insulating materials must be used that can survive the high temperature reactions (650 to 800 C) necessary to form the superconducting compounds. The issues associated with high-field dipole magnets have been discussed at a number of workshops, including those at DESY in 1991 and LBL in 1992. These workshops were extremely useful in defining the problems and focusing the attention of both materials and magnet experts on high-field dipole magnets; however, since neither set of proceedings was published, the information is not readily available. More recently, a workshop was held in Erice, Italy, under the sponsorship of the Ettore Maiorana Center for Scientific Culture. This international workshop was attended by 20 scientists from Europe, Japan, and the U.S., and the summary of that work, which represents the most recent and thorough assessment of the status of high-field magnets for accelerator magnets, is presented.

Scanlan, R.M.; Barletta, W.A.; Dell'Orco, D.; McInturff, A.D.; Asner, A.; Collings, E.W.; Dahl, P.F.; Desportes, H.; Devred, A.; Garre, R.; Gregory, E.; Hassenzahl, W.; Lamm, M.; Larbalestier, D.; Leory, D.; McIntyre, P.; Miller, J.; Shintomi, T.; ten Kate, H.; Wipf, S.

1994-10-01T23:59:59.000Z

202

lgebra Linear Mauro Rincon  

E-Print Network [OSTI]

8.1 Álgebra Linear Mauro Rincon Márcia Fampa Aula 8: Soluções de Sistemas de Equações Lineares #12

Cabral, Marco

203

TOP AND HIGGS PHYSICS AT THE HADRON COLLIDERS  

SciTech Connect (OSTI)

This review summarizes the recent results for top quark and Higgs boson measurements from experiments at Tevatron, a protonantiproton collider at a center-of-mass energy of ? s =1 . 96 TeV, and the Large Hadron Collider, a protonproton collider at a center- of-mass energy of ? s = 7 TeV. These results include the discovery of a Higgs-like boson and measurement of its various properties, and measurements in the top quark sector, e.g. top quark mass, spin, charge asymmetry and production of single top quark.

Jabeen, Shabnam

2013-10-20T23:59:59.000Z

204

Linear Collider Collaboration Tech Notes LCC-0140 SLAC-TN-04-041  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

0 0 SLAC-TN-04-041 June 2004 Abstract This note documents a set of expressions used to explore the issue of whether or not it is reasonable to consider a conventional positron source for a Tesla formatted beam. The critical issue is that of energy deposition in the conversion target and the comparison of the induced stress with the ultimate tensile strength of the target material. Since the length of the incident beam pulse is large in comparison to the ratio of beam size to the speed of sound, the concurrent pressure pulse dissipates in a time short compared to the overall pulse duration and one is left with only the Sensitivity to Nano-Tesla Scale Stray Magnetic Fields J. Frisch, T.O. Raubenheimer, P. Tenenbaum

205

Linear Collider Collaboration Tech Notes LCC-0139 SLAC-TN-04-042  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

9 9 SLAC-TN-04-042 May 2004 Abstract This note documents a set of expressions used to explore the issue of whether or not it is reasonable to consider a conventional positron source for a Tesla formatted beam. The critical issue is that of energy deposition in the conversion target and the comparison of the induced stress with the ultimate tensile strength of the target material. Since the length of the incident beam pulse is large in comparison to the ratio of beam size to the speed of sound, the concurrent pressure pulse dissipates in a time short compared to the overall pulse duration and one is left with only the Alternative Main Linac BNS Configurations for Reduced Energy Spread Andrei Seryi and Peter Tenenbaum

206

Linear Collider Collaboration Tech Notes LCC-0147 CBP Tech Note-319  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

7 7 CBP Tech Note-319 June 2004 Abstract This note documents a set of expressions used to explore the issue of whether or not it is reasonable to consider a conventional positron source for a Tesla formatted beam. The critical issue is that of energy deposition in the conversion target and the comparison of the induced stress with the ultimate tensile strength of the target material. Since the length of the incident beam pulse is large in comparison to the ratio of beam size to the speed of sound, the concurrent pressure pulse dissipates in a time short compared to the overall pulse duration and one is left with only the Intrabeam Scattering in the NLC Main Damping Rings A. Wolski June 2004 Lawrence Berkeley National Laboratory

207

Linear Collider Collaboration Tech Notes LCC-0130 CBP Tech Note-302  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

30 30 CBP Tech Note-302 March 2004 Abstract This note documents a set of expressions used to explore the issue of whether or not it is reasonable to consider a conventional positron source for a Tesla formatted beam. The critical issue is that of energy deposition in the conversion target and the comparison of the induced stress with the ultimate tensile strength of the target material. Since the length of the incident beam pulse is large in comparison to the ratio of beam size to the speed of sound, the concurrent pressure pulse dissipates in a time short compared to the overall pulse duration and one is left with only the Research and Development Issues for NLC Damping Rings 2003-2004 A. Wolski Lawrence Berkeley National Laboratory

208

Linear Collider Collaboration Tech Notes LCC-0132 SLAC-PUB-10229  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

2 2 SLAC-PUB-10229 November 2003 Abstract This note documents a set of expressions used to explore the issue of whether or not it is reasonable to consider a conventional positron source for a Tesla formatted beam. The critical issue is that of energy deposition in the conversion target and the comparison of the induced stress with the ultimate tensile strength of the target material. Since the length of the incident beam pulse is large in comparison to the ratio of beam size to the speed of sound, the concurrent pressure pulse dissipates in a time short compared to the overall pulse duration and one is left with only the Transverse Deflections in a Cavity Due to the Short-range Longitudinal Wake K. L. F. Bane, T. O. Raubenheimer, G. Stupakov, J. Wu

209

Linear Collider Collaboration Tech Notes LCC-0105 CBP Tec Note-266  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

5 5 CBP Tec Note-266 October 2002 Effects of Systematic Multipole Errors on the Dynamic Aperture of the NLC Main Damping Rings A. Wolski, J.-Y. Jung Lawrence Berkeley National Laboratory University of California Berkeley, CA Abstract: Recent work on designs of dipoles, quadrupoles and sextupoles for the NLC Main Damping Ring has led to estimates of the systematic multipole components in the fields of these magnets. We report on studies of the effects of these multipoles on the dynamic aperture of the damping ring, and show that the systematic multipole components in the present magnet designs are unlikely to be a severe limitation. LCC-0105 CBP Tech Note-266 Effects of Systematic Multipole Errors on the Dynamic

210

Linear Collider Collaboration Tech Notes LCC-0080 CBP Tech Note-244  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

0 0 CBP Tech Note-244 May 2002 Estimates of Collective Effects in the NLC Main Damping Rings A. Wolski and S. de Santis Lawrence Berkeley National Laboratory Berkeley, California Abstract: Damping Ring performance depends on the ability to store the design beam current, and extract the beam with the specified low transverse emittance. Given the high bunch charge and moderate energy, a variety of collective effects could play a significant role, in either limiting the bunch current, or increasing the emittance. Here, we estimate the consequences of various effects, based on current theories and understanding. LCC-0080 CBP Tech Note-244 Estimates of Collective Effects in the NLC Main Damping Rings A. Wolski and S. de Santis Lawrence Berkeley National Laboratory

211

Linear Collider Collaboration Tech Notes LCC-0150 CBP Tech Note-321  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

0 0 CBP Tech Note-321 June 2004 Abstract This note documents a set of expressions used to explore the issue of whether or not it is reasonable to consider a conventional positron source for a Tesla formatted beam. The critical issue is that of energy deposition in the conversion target and the comparison of the induced stress with the ultimate tensile strength of the target material. Since the length of the incident beam pulse is large in comparison to the ratio of beam size to the speed of sound, the concurrent pressure pulse dissipates in a time short compared to the overall pulse duration and one is left with only the Research and Development Issues for NLC Damping Rings 2004-2005 A. Wolski June 2004

212

Linear Collider Collaboration Tech Notes LCC-0155 CBP Tech Note-326  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

5 5 CBP Tech Note-326 July 2004 Abstract This note documents a set of expressions used to explore the issue of whether or not it is reasonable to consider a conventional positron source for a Tesla formatted beam. The critical issue is that of energy deposition in the conversion target and the comparison of the induced stress with the ultimate tensile strength of the target material. Since the length of the incident beam pulse is large in comparison to the ratio of beam size to the speed of sound, the concurrent pressure pulse dissipates in a time short compared to the overall pulse duration and one is left with only the Spin-Tracking Studies for Beam Polarization Preservation in the NLC Main Damping Rings

213

Alignment tolerance of accelerating structures and corrections for future linear colliders  

SciTech Connect (OSTI)

The alignment tolerance of accelerating structures is estimated by tracking simulations. Both single-bunch and multi-bunch effects are taken into account. Correction schemes for controlling the single and multi-bunch emittance growth in the case of large misalignment are also tested by simulations.

Kubo, K.; Adolphsen, C.; Bane, K.L.F.; Raubenheimer, T.O.; Thompson, K.A.

1995-06-01T23:59:59.000Z

214

A Beam Driven Plasma-Wakefield Linear Collider: From Higgs Factory...  

Office of Scientific and Technical Information (OSTI)

experiments that showed the great potential of plasma accelerators. The FACET ii test facility at SLAC will, in the period 2012-2016, further study several issues that are...

215

Linear Collider Collaboration Tech Notes LCC-0141 SLAC-TN-04-040  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

1 1 SLAC-TN-04-040 May 2004 Abstract This note documents a set of expressions used to explore the issue of whether or not it is reasonable to consider a conventional positron source for a Tesla formatted beam. The critical issue is that of energy deposition in the conversion target and the comparison of the induced stress with the ultimate tensile strength of the target material. Since the length of the incident beam pulse is large in comparison to the ratio of beam size to the speed of sound, the concurrent pressure pulse dissipates in a time short compared to the overall pulse duration and one is left with only the Availability and Failure Effects of NLC Main Linac Mechanical Movers T. M. Himel, C. Spencer, Peter Tenenbaum

216

Linear chain magnetism  

Science Journals Connector (OSTI)

Linear chain magnetism ... A brief introduction to this concept, which is also called lower dimensional magnetism. ...

Richard L. Carlin

1991-01-01T23:59:59.000Z

217

Weak Boson Emission in Hadron Collider Processes  

E-Print Network [OSTI]

The O(alpha) virtual weak radiative corrections to many hadron collider processes are known to become large and negative at high energies, due to the appearance of Sudakov-like logarithms. At the same order in perturbation theory, weak boson emission diagrams contribute. Since the W and Z bosons are massive, the O(alpha) virtual weak radiative corrections and the contributions from weak boson emission are separately finite. Thus, unlike in QED or QCD calculations, there is no technical reason for including gauge boson emission diagrams in calculations of electroweak radiative corrections. In most calculations of the O(alpha) electroweak radiative corrections, weak boson emission diagrams are therefore not taken into account. Another reason for not including these diagrams is that they lead to final states which differ from that of the original process. However, in experiment, one usually considers partially inclusive final states. Weak boson emission diagrams thus should be included in calculations of electroweak radiative corrections. In this paper, I examine the role of weak boson emission in those processes at the Fermilab Tevatron and the CERN LHC for which the one-loop electroweak radiative corrections are known to become large at high energies (inclusive jet, isolated photon, Z+1 jet, Drell-Yan, di-boson, t-bar t, and single top production). In general, I find that the cross section for weak boson emission is substantial at high energies and that weak boson emission and the O(alpha) virtual weak radiative corrections partially cancel.

U. Baur

2006-11-17T23:59:59.000Z

218

Cryogenics for the Large Hadron Collider  

E-Print Network [OSTI]

The Large Hadron Collider (LHC), a 26.7 km circumference superconducting accelerator equipped with high-field magnets operating in superfluid helium below 1.9 K, has now fully entered construction at CERN, the European Laboratory for Particle Physics. The heart of the LHC cryogenic system is the quasi-isothermal magnet cooling scheme, in which flowing two-phase saturated superfluid helium removes the heat load from the 36'000 ton cold mass, immersed in some 400 m3 static pressurised superfluid helium. The LHC also makes use of supercritical helium for non-isothermal cooling of the beam screens which intercept most of the dynamic heat loads at higher temperature. Although not used in normal operation, liquid nitrogen will provide the source of refrigeration for precooling the machine. Refrigeration for the LHC is produced in eight large refrigerators, each with an equivalent capacity of about 18 kW at 4.5 K, completed by 1.8 K refrigeration units making use of several stages of hydrodynamic cold compressors. T...

Lebrun, P

1999-01-01T23:59:59.000Z

219

Cryogenics for the Large Hadron Collider  

E-Print Network [OSTI]

The Large Hadron Collider (LHC), a 26.7 km circumference superconducting accelerator equipped with high-field magnets operating in superfluid helium below 1.9 K, has now fully entered construction at CERN, the European Laboratory for Particle Physics. The heart of the LHC cryogenic system is the quasi-isothermal magnet cooling scheme, in which flowing two-phase saturated superfluid helium removes the heat load from the 36000 ton cold mass, immersed in some 400 m/sup 3/ static pressurised superfluid helium. The LHC also makes use of supercritical helium for nonisothermal cooling of the beam screens which intercept most of the dynamic heat loads at higher temperature. Although not used in normal operation, liquid nitrogen will provide the source of refrigeration for precooling the machine. Refrigeration for the LHC is produced in eight large refrigerators, each with an equivalent capacity of about 18 kW at 4.5 K, completed by 1.8 K refrigeration units making use of several stages of hydrodynamic cold compressor...

Lebrun, P

2000-01-01T23:59:59.000Z

220

First Beam for Large Hadron Collider | Department of Energy  

Broader source: Energy.gov (indexed) [DOE]

Beam for Large Hadron Collider Beam for Large Hadron Collider First Beam for Large Hadron Collider September 10, 2008 - 3:20pm Addthis WASHINGTON, DC - An international collaboration of scientists today sent the first beam of protons zooming at nearly the speed of light around the world's most powerful particle accelerator-the Large Hadron Collider (LHC)-located at the CERN laboratory near Geneva, Switzerland. The U.S. Department of Energy (DOE) and the National Science Foundation (NSF) invested a total $531 million in the construction of the accelerator and its detectors, which scientists believe could help unlock extraordinary discoveries about the nature of the physical universe. Celebrations across the U.S. and around the world mark the LHC's first circulating beam, an occasion more than 15 years in the making. An

Note: This page contains sample records for the topic "level linear collider" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


221

Brookhaven National Laboratory The Relativistic Heavy Ion Collider (RHIC)  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

Relativistic Heavy Ion Collider (RHIC) Relativistic Heavy Ion Collider (RHIC) An Exciting Beginning and a Compelling Future At the Relativistic Heavy Ion Collider (RHIC), a world-class particle accelerator at Brookhaven National Laboratory, physicists are exploring the most fundamental forces and properties of matter and the early universe, with important implications for our understanding of the world around us. Operated with funding from the U.S. Department of Energy's Office of Science, the Relativistic Heavy Ion Collider (RHIC), was designed to recreate a state of matter thought to have existed immediately after the Big Bang some 13 billion years ago, and to investigate how the proton gets its spin and intrinsic magnetism from its quark and gluon constituents. Large detectors located

222

Neutrino alternatives for missing energy events at colliders  

Science Journals Connector (OSTI)

If the dark matter consists of a weakly interacting massive particle, it can be produced and studied at future collider experiments like those at the LHC. The production of collider-stable weakly interacting massive particles is characterized by hard scattering events with large missing transverse energy. Here we emphasize and discuss the fact that the discovery of events inconsistent with the standard model with large missing transverse energy need not point to the existence of new, collider-stable particles. We explore an alternative explanation where the only sources of missing transverse energy are standard model neutrinos. We present concrete examples of such scenarios, focusing on supersymmetric models with R-parity violation. We also discuss means of differentiating neutrino missing energy signals from the production of new collider-stable particles. These include both model-dependent signals, such as particle tags and flavor counts, as well as model-independent tests that attempt to measure the missing particle mass.

Spencer Chang and Andr de Gouva

2009-07-15T23:59:59.000Z

223

Beam Measurements on Argonne Linac for Collider Injector Design  

Science Journals Connector (OSTI)

The 20 MeV electron linac at Argonne produces 5 1010 electrons in a single bunch. This amount of charge per bunch is required for the proposed single pass collider at SLAC. For this reason the characteristics o...

G. Mavrogenes; M. B. James; R. F. Koontz

1980-01-01T23:59:59.000Z

224

Global QCD Analysis and Collider Phenomenology--CTEQ  

E-Print Network [OSTI]

An overview is given of recent progress on a variety of fronts in the global QCD analysis of the parton structure of the nucleon and its implication for collider phenomenology, carried out by various subgroups of the CTEQ collaboration.

Wu-Ki Tung; H. L. Lai; J. Pumplin; P. Nadolsky; C. -P. Yuan

2007-07-02T23:59:59.000Z

225

June 30, 2008: US portion of Large Hadron Collider completed  

Broader source: Energy.gov [DOE]

June 30, 2008The Department and the National Science Foundation announce that the U.S. contribution to the Large Hadron Collider (LHC) has been completed on budget and ahead of schedule. The LHC,...

226

Studies of Gauge Boson Production with a gamma/gamma-collider at TESLA  

E-Print Network [OSTI]

In absence of the Standard Model Higgs boson the interaction among the gauge bosons becomes strong at high energies and influences the couplings between them. Each trilinear and quartic gauge boson vertex is characterised by a set of couplings which are expected to deviate from their Standard Model values already at energies lower than the energy scale of the New Physics.The precise measurement of gauge boson couplings can provide clues to the mechanism of the electroweak symmetry breaking and their anomalous values can be a sign of a New Physics effect beyond the Standard Model. The estimated precisions of the trilinear gauge boson coupling (TGC) measurements at a photon collider are about one to two orders of magnitude higher than at LEP and Tevatron providing a measurement highly sensitive to the physics beyond the Standard Model. The optimisation of the forward region of the photon collider detector brings the amount of the low-energy background to the manageable level providing a clean environment for the TGC measurements at a photon collider with estimated precisions.

Jadranka Sekaric

2006-01-16T23:59:59.000Z

227

Accelerator Physics of a Muon Collider Kirk T. McDonald  

E-Print Network [OSTI]

.edu October 20, 1998 Seminar at the Princeton Plasma Physics Laboratory Muon Collider main page: http(Some) Accelerator Physics of a Muon Collider Kirk T. McDonald Princeton U. mcdonald@puphep.princeton.html Princeton Muon Collider page: http://puhep1.princeton.edu/mumu/ 1 #12; What is a Muon Collider

McDonald, Kirk

228

Accelerator Physics of a Muon Collider Kirk T. McDonald  

E-Print Network [OSTI]

.edu October 20, 1998 Seminar at the Princeton Plasma Physics Laboratory Muon Collider main page: http(Some) Accelerator Physics of a Muon Collider Kirk T. McDonald Princeton U. mcdonald@puphep.princeton.html Princeton Muon Collider page: http://puhep1.princeton.edu/mumu/ 1 #12;What is a Muon Collider

McDonald, Kirk

229

Linear Programming: Penn State Math 484 Lecture Notes  

E-Print Network [OSTI]

. Matrix Inverse 35 6. Solution of Linear Equations 37 7. Linear Combinations, Span, Linear Independence 39 Programs with Matlab 47 Chapter 4. Convex Sets, Functions and Cones and Polyhedral Theory 51 1. Convex Sets on the Graph of z. The level sets existing in R2 while the graph of z existing R3 . The level sets have been

Squicciarini, Anna Cinzia

230

On Field Emission in High Energy Colliders Initiated by a Relativistic Positively Charged Bunch of Particles  

E-Print Network [OSTI]

The design of the LHC and future colliders aims their operation with high intensity beams, with bunch population, $N_p$, of the order of $10^{11}$. This is dictated by a desire to study very rare processes with maximum data sample. HEP colliders are engineering structures of many kilometers in length, whose transverse compactness is achieved by the application of the superconducting technologies and limitations of cost. However the compactness of the structural elements conceals and potential danger for the stable work of the accelerator. This is because a high intensity beam of positively charged particles (protons, positrons, ions) creates around itself an electric self-field of very high intensity, $10^5 - 10^6$ V/cm. Being located near the conducting surfaces, at the distances of 1-20 mm away from them, the field of such bunches activates the field emission of electrons from the surface. These electrons, in addition to electrons from the ionization of residual gases, secondary electrons and electrons knocked out by synchrotron radiation, contribute to the development of a dense electron cloud in the transport line. The particles of the bunch, being scattered on the dense electron cloud with $N_e\\sim N_p$, leaves the beam and may cause noticeable damage. The paper presents an analysis of the conditions, under which the field emission in the LHC collimator system may become a serious problem. The analogous analysis of a prototype of the International Linear Collider (ILC) project, USLC, reveals that a noticeable field emission will accompany positron bunches on their entire path during acceleration.

B. B. Levchenko

2006-08-12T23:59:59.000Z

231

Looking for hints of a reconstructible seesaw model at the Large Hadron Collider  

E-Print Network [OSTI]

We study the production of heavy neutrinos at the Large Hadron Collider (LHC) through the dominant s-channel production mode as well as the vector boson fusion (VBF) process. We consider the TeV scale minimal linear seesaw model containing two heavy singlets with opposite lepton number. This model is fully reconstructible from oscillation data apart from an overall normalization constant which can be constrained from meta-stability of the electroweak vacuum and bounds coming from lepton flavor violation (LFV) searches. Dirac nature of heavy neutrinos in this model implies suppression of the conventional same-sign-dilepton signal at the LHC. We analyze the collider signatures with tri-lepton final state and missing transverse energy as well as VBF type signals which are characterized by two additional forward tagged jets. Our investigation reveals that due to stringent constraints on light-heavy mixing coming from LFV and meta-stability bounds, the model can be explored only for light to moderate mass range of...

Bambhaniya, Gulab; Khan, Subrata; Konar, Partha; Mondal, Tanmoy

2014-01-01T23:59:59.000Z

232

Looking for hints of a reconstructible seesaw model at the Large Hadron Collider  

E-Print Network [OSTI]

We study the production of heavy neutrinos at the Large Hadron Collider (LHC) through the dominant s-channel production mode as well as the vector boson fusion (VBF) process. We consider the TeV scale minimal linear seesaw model containing two heavy singlets with opposite lepton number. This model is fully reconstructible from oscillation data apart from an overall normalization constant which can be constrained from meta-stability of the electroweak vacuum and bounds coming from lepton flavor violation (LFV) searches. Dirac nature of heavy neutrinos in this model implies suppression of the conventional same-sign-dilepton signal at the LHC. We analyze the collider signatures with tri-lepton final state and missing transverse energy as well as VBF type signals which are characterized by two additional forward tagged jets. Our investigation reveals that due to stringent constraints on light-heavy mixing coming from LFV and meta-stability bounds, the model can be explored only for light to moderate mass range of heavy neutrinos. We also note that in case of a positive signal, flavor counting of the final tri-lepton channel can give information about the mass hierarchy of the light neutrinos.

Gulab Bambhaniya; Srubabati Goswami; Subrata Khan; Partha Konar; Tanmoy Mondal

2014-10-21T23:59:59.000Z

233

Piecewise Linear Phase Transitions  

E-Print Network [OSTI]

It is shown how simple assumptions lead to piecewise linear behavior, which is observed in certain phase transitions.

Joseph B. Keller

2007-11-26T23:59:59.000Z

234

Beam-strahlung effects in e-p collider  

SciTech Connect (OSTI)

The electromagnetic fields produced by one beam in an interaction point of a colliding-beam facility cause to the emission of synchrotron radiation by the other beam. This effect, the beam strahlung, for the e+e/sup -/ colliders has been considered by several authors, and they have pointed out that the effect is very important consideration at very-high-energy e+e/sup -/ colliders. At the first glance, the beam-strahlung effect can play an important role in the e-p collision due to the fact that the circulating currents in the collider are much higher than those of the e+e/sup -/ machine. However the detailed study shows that is not the case because of the collision geometry involved. What follows in this note is the beam-strahlung derivations using the method previously used by Hofmann and Keil. The difference between this note and that of Hofman and Keil is that in the case of e+e/sup -/ collider, equal mass particles are involved in the consideration and, in the e-p case, the electrons radiate and the protons provide the electromagnetic fields.

Cho, Y.

1982-09-01T23:59:59.000Z

235

Transverse beams stability studies at the Large Hadron Collider  

E-Print Network [OSTI]

A charged particle beam travelling at the speed of light produces large electromagnetic wake fields which, through interactions with its surroundings, act back on the particles in the beam. This coupled system may become unstable, resulting in a deterioration of the beam quality. Such effects play a major role in most existing storage rings, as they limit the maximum performance achievable. In a collider, the presence of a second beam significantly changes the dynamics, as the electromagnetic interactions of the two beams on each other are usually very strong and may, also, limit the collider performances. This thesis treats the coherent stability of the two beams in a circular collider, including the effects of the electromagnetic wake fields and of the beam-beam interactions, with particular emphasis on CERN's Large Hadron Collider. As opposed to other colliders, this machine features a large number of bunches per beam each experiencing multiple long-range and head-on beam-beam interactions. Existing models...

Buffat, Xavier; Pieloni, Tatiana

2015-01-30T23:59:59.000Z

236

Precision linear ramp function generator  

DOE Patents [OSTI]

A ramp function generator is provided which produces a precise linear ramp function which is repeatable and highly stable. A derivative feedback loop is used to stabilize the output of an integrator in the forward loop and control the ramp rate. The ramp may be started from a selected baseline voltage level and the desired ramp rate is selected by applying an appropriate constant voltage to the input of the integrator.

Jatko, W.B.; McNeilly, D.R.; Thacker, L.H.

1984-08-01T23:59:59.000Z

237

Introduction to Linear Bialgebra  

E-Print Network [OSTI]

The algebraic structure, linear algebra happens to be one of the subjects which yields itself to applications to several fields like coding or communication theory, Markov chains, representation of groups and graphs, Leontief economic models and so on. This book has for the first time, introduced a new algebraic structure called linear bialgebra, which is also a very powerful algebraic tool that can yield itself to applications. With the recent introduction of bimatrices (2005)we have ventured in this book to introduce new concepts like linear bialgebra and Smarandache neutrosophic linear bialgebra and also give the applications of these algebraic structures. It is important to mention here it is a matter of simple exercise to extend these to linear n-algebra for any n greater than 2; for n = 2 we get the linear bialgebra. This book has five chapters. In the first chapter we just introduce some basic notions of linear algebra and Slinear algebra and their applications. Chapter two introduces some new algebraic bistructures. In chapter three we introduce the notion of linear bialgebra and discuss several interesting properties about them. Also, application of linear bialgebra to bicodes is given. A remarkable part of our research in this book is the introduction of the notion of birepresentation of bigroups. The fourth chapter introduces several neutrosophic algebraic structures since they help in defining the new concept of neutrosophic linear bialgebra, neutrosophic bivector spaces, Smarandache neutrosophic linear bialgebra and Smarandache neutrosophic bivector spaces. Theirprobable applications to real-world models are discussed.

W. B. Vasantha Kandasamy; Florentin Smarandache; K. Ilanthenral

2005-08-15T23:59:59.000Z

238

When Galaxies Collide: Ripples Indicate Recent Impact Close to Home |  

Broader source: Energy.gov (indexed) [DOE]

When Galaxies Collide: Ripples Indicate Recent Impact Close to Home When Galaxies Collide: Ripples Indicate Recent Impact Close to Home When Galaxies Collide: Ripples Indicate Recent Impact Close to Home June 28, 2012 - 11:16am Addthis This is a graphic representation of the Milky Way, the galaxy in which Earth is contained. Scientists know of more than 20 visible satellite galaxies that circle the center of the Milky Way, with masses ranging from one million to one billion solar masses. Occasionally, one of these orbiting galaxies pass through the Milky Way making waves for millennia. | Graphic courtesy of NASA This is a graphic representation of the Milky Way, the galaxy in which Earth is contained. Scientists know of more than 20 visible satellite galaxies that circle the center of the Milky Way, with masses ranging from

239

Taking the 'Large' out of Large Hadron Collider: Computational Breakthrough  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

Home » News & Publications » News » Science News » Taking the 'Large' out of Large Hadron Collider Taking the 'Large' out of Large Hadron Collider Computational breakthrough hastens modeling of 'tabletop accelerators' August 9, 2010 | Tags: Accelerator Science Contact: Margie Wylie | mwylie@lbl.gov | 510-486-7421 mori1 This 3D simulation shows how laser pulses create plasma wakes that propel electrons forward, much as a surfer is propelled forward by an ocean wave. Laser wakefield acceleration promises electron accelerators that are thousands of times more powerful than, yet a fraction the size of, conventional radio frequency devices. Particle accelerators like the Large Hadron Collider (LHC) at CERN are the big rock stars of high-energy physics-really big. The LHC cost nearly

240

The Relativistic Heavy Ion Collider (RHIC) - the nation's only remaining  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

Collider (RHIC) - the nation's only remaining Collider (RHIC) - the nation's only remaining particle collider, located at Brookhaven National Laboratory - has made a series of landmark discoveries and continuing breakthroughs in science and technology. One major accomplishment has been RHIC's ability to recreate and study in detail a type of matter that last existed at the beginning of the universe to better understand the strongest force in nature - the force that holds together the fundamental particles that make up 99 percent of visible matter in the universe today, everything from stars to planets to people. In addition to giving us a new way to explore and understand the nature of the early universe and the force that holds together ordinary matter, research at RHIC has revealed stunning

Note: This page contains sample records for the topic "level linear collider" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


241

When Galaxies Collide: Ripples Indicate Recent Impact Close to Home |  

Broader source: Energy.gov (indexed) [DOE]

When Galaxies Collide: Ripples Indicate Recent Impact Close to Home When Galaxies Collide: Ripples Indicate Recent Impact Close to Home When Galaxies Collide: Ripples Indicate Recent Impact Close to Home June 28, 2012 - 11:16am Addthis This is a graphic representation of the Milky Way, the galaxy in which Earth is contained. Scientists know of more than 20 visible satellite galaxies that circle the center of the Milky Way, with masses ranging from one million to one billion solar masses. Occasionally, one of these orbiting galaxies pass through the Milky Way making waves for millennia. | Graphic courtesy of NASA This is a graphic representation of the Milky Way, the galaxy in which Earth is contained. Scientists know of more than 20 visible satellite galaxies that circle the center of the Milky Way, with masses ranging from

242

Massive Stars in Colliding Wind Systems: the GLAST Perspective  

SciTech Connect (OSTI)

Colliding winds of massive stars in binary systems are considered as candidate sites of high-energy non-thermal photon emission. They are already among the suggested counterparts for a few individual unidentified EGRET sources, but may constitute a detectable source population for the GLAST observatory. The present work investigates such population study of massive colliding wind systems at high-energy gamma-rays. Based on the recent detailed model (Reimer et al. 2006) for non-thermal photon production in prime candidate systems, we unveil the expected characteristics of this source class in the observables accessible at LAT energies. Combining the broadband emission model with the presently cataloged distribution of such systems and their individual parameters allows us to conclude on the expected maximum number of LAT-detections among massive stars in colliding wind binary systems.

Reimer, Anita; Reimer, Olaf; /Stanford U., HEPL /KIPAC, Menlo Park

2011-11-29T23:59:59.000Z

243

Symmetric Achromatic Low-Beta Collider Interaction Region Design Concept  

SciTech Connect (OSTI)

We present a new symmetry-based concept for an achromatic low-beta collider interaction region design. A specially-designed symmetric Chromaticity Compensation Block (CCB) induces an angle spread in the passing beam such that it cancels the chromatic kick of the final focusing quadrupoles. Two such CCB?s placed symmetrically around an interaction point allow simultaneous compensation of the 1st-order chromaticities and chromatic beam smear at the IP without inducing significant 2nd-order aberrations. We first develop an analytic description of this approach and explicitly formulate 2nd-order aberration compensation conditions at the interaction point. The concept is next applied to develop an interaction region design for the ion collider ring of an electron-ion collider. We numerically evaluate performance of the design in terms of momentum acceptance and dynamic aperture. The advantages of the new concept are illustrated by comparing it to the conventional distributed-sextupole chromaticity compensation scheme.

Morozov, Vasiliy S. [Thomas Jefferson National Accelerator Facility, Newport News, VA (United States); Derbenev, Yaroslav S. [Thomas Jefferson National Accelerator Facility, Newport News, VA (United States); Lin, Fanglei [Thomas Jefferson National Accelerator Facility, Newport News, VA (United States); Johnson, Rolland P. [Muons, Inc., Batavia, IL (United States)

2013-01-01T23:59:59.000Z

244

Emergent cosmological constant from colliding electromagnetic waves  

E-Print Network [OSTI]

In this study we advocate the view that the cosmological constant is of electromagnetic (em) origin, which can be generated from the collision of em shock waves coupled with gravitational shock waves. The wave profiles that participate in the collision have different amplitudes. It is shown that, circular polarization with equal amplitude waves does not generate cosmological constant. We also prove that the generation of the cosmological constant is related to the linear polarization. The addition of cross polarization generates no cosmological constant. Depending on the value of the wave amplitudes, the generated cosmological constant can be positive or negative. We show additionally that, the collision of nonlinear em waves in a particular class of Born-Infeld theory also yields a cosmological constant.

M. Halilsoy; S. Habib Mazharimousavi; O. Gurtug

2014-10-15T23:59:59.000Z

245

A concept of the photon collider beam dump  

E-Print Network [OSTI]

Photon beams at photon colliders are very narrow, powerful (10--15 MW) and cannot be spread by fast magnets (because photons are neutral). No material can withstand such energy density. For the ILC-based photon collider, we suggest using a 150 m long, pressurized (P ~ 4 atm) argon gas target in front of a water absorber which solves the overheating and mechanical stress problems. The neutron background at the interaction point is estimated and additionally suppressed using a 20 m long hydrogen gas target in front of the argon.

L. I. Shekhtman; V. I. Telnov

2014-09-19T23:59:59.000Z

246

Charge recombination in the muon collider cooling channel  

SciTech Connect (OSTI)

The final stage of the ionization cooling channel for the muon collider must transversely recombine the positively and negatively charged bunches into a single beam before the muons can be accelerated. It is particularly important to minimize any emittance growth in this system since no further cooling takes place before the bunches are collided. We have found that emittance growth could be minimized by using symmetric pairs of bent solenoids and careful matching. We show that a practical design can be found that has transmission {approx}99%, emittance growth less than 0.1%, and minimal dispersion in the recombined bunches.

Fernow, R. C.; Palmer, R. B. [Physics Department, Brookhaven National Laboratory, Upton, NY 11973 (United States)

2012-12-21T23:59:59.000Z

247

Particle acceleration in the colliding winds binary WR140  

E-Print Network [OSTI]

Massive WR+O star systems produce high-temperature, shock-heated plasma where the wind of the WR star and that of its binary companion collide - the wind-collision region (WCR). The WCR is a source of thermal (e.g. hard X-rays) and non-thermal (e.g. synchrotron) emission, the latter arising from electrons and ions accelerated to relativistic energies. These colliding wind binaries provide an excellent laboratory for the study of particle acceleration at higher mass, photon and magnetic energy densities than exist in SNRs. Recent models of the non-thermal emission from WR 140 have provided insight into this process.

J. M. Pittard; S. M. Dougherty

2007-03-23T23:59:59.000Z

248

Optical data transmission at the superconducting super collider  

SciTech Connect (OSTI)

Digital and analog data transmissions via fiber optics for the Superconducting Super Collider have been investigated. The state of the art of optical transmitters, low loss fiber waveguides, receivers and associated electronics components are reviewed and summarized. Emphasis is placed on the effects of the radiation environment on the performance of an optical data transmission system components. Also, the performance of candidate components of the wide band digital and analog transmission systems intended for deployment of the Superconducting Super Collider Detector is discussed. 27 refs., 15 figs.

Leskovar, B.

1989-02-01T23:59:59.000Z

249

Collider Detector at Fermilab (CDF): Data from B Hadrons Research  

DOE Data Explorer [Office of Scientific and Technical Information (OSTI)]

The Collider Detector at Fermilab (CDF) is a Tevatron experiment at Fermilab. The Tevatron, a powerful particle accelerator, accelerates protons and antiprotons close to the speed of light, and then makes them collide head-on inside the CDF detector. The CDF detector is used to study the products of such collisions. The CDF Physics Group is organized into six working groups, each with a specific focus. The Bottom group studies the production and decay of B hadrons. Their public web page makes data and numerous figures available from both CDF Runs I and II.

250

History of Proton Linear Accelerators  

E-Print Network [OSTI]

much. References 1. Linear Accelerators, edited by P. M .at the 1986 Linear Accelerator Conference, SLAC, Stanford,HISTORY OF PROTON LINEAR ACCELERATORS Luis W. Alvarez TWO-

Alvarez, Luis W.

1987-01-01T23:59:59.000Z

251

Configuration Manual Polarized Proton Collider at RHIC  

SciTech Connect (OSTI)

In this report we present our design to accelerate and store polarized protons in RHIC, with the level of polarization, luminosity, and control of systematic errors required by the approved RHIC spin physics program. We provide an overview of the physics to be studied using RHIC with polarized proton beams, and a brief description of the accelerator systems required for the project.

Roser T.; Alekseev& #44; I.; Allgower& #44; C.; Bai& #44; M.; Batygin& #44; Y.; et al

2006-01-01T23:59:59.000Z

252

Unit I-2 Linear Maps 1 Linear maps  

E-Print Network [OSTI]

Unit I-2 Linear Maps 1 Unit I-2 Linear maps Unit I-2 Linear Maps 2 Linear map · V & U are vector spaces over the same scalars · a function f: VU is a linear map if it preserves the vector space transformation [particularly when f: RnRm] ­ linear operator when f: V V [same v.s.] ­ linear mapping ­ linear

Birkett, Stephen

253

lgebra Linear Mauro Rincon  

E-Print Network [OSTI]

10.1 Álgebra Linear Mauro Rincon Márcia Fampa Aula 10: Determinantes #12;10.2 8.1 - Definições #12

Cabral, Marco

254

Linear Graphene Plasmons  

Science Journals Connector (OSTI)

The coupling of the plasmon spectra of graphene and a nearby thick plasma is examined here in detail. The coupled modes include linear plasmons. Keywords: Graphene, plasmons, surface

N. J.M. Horing

2010-11-01T23:59:59.000Z

255

Focusing in Linear Accelerators  

DOE R&D Accomplishments [OSTI]

Review of the theory of focusing in linear accelerators with comments on the incompatibility of phase stability and first-order focusing in a simple accelerator.

McMillan, E. M.

1950-08-24T23:59:59.000Z

256

High-energy colliders and the rise of the standard model  

Science Journals Connector (OSTI)

... in 1983, by the UA1 and UA2 experiments at the 560640-GeV Super Proton Synchroton (SPS) protonantiproton collider at CERN a collider project that was conceived for ...

Terry Wyatt

2007-07-18T23:59:59.000Z

257

E-Print Network 3.0 - asymmetric colliding nuclei Sample Search...  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

colliding nuclei Search Powered by Explorit Topic List Advanced Search Sample search results for: asymmetric colliding nuclei Page: << < 1 2 3 4 5 > >> 1 managed for the U.S....

258

MERCURY HANDLING FOR THE TARGET SYSTEM FOR A MUON COLLIDER  

E-Print Network [OSTI]

MERCURY HANDLING FOR THE TARGET SYSTEM FOR A MUON COLLIDER (IPAC12, WEPPD038) The target station a 15-20 T superconducting magnet. The target itself is a free mercury jet, moving at 20 m/s at an small angle to the magnetic axis, so as later to be collected in a mercury pool/beam dump. The replaceable

McDonald, Kirk

259

MERCURY HANDLING FOR THE TARGET SYSTEM FOR A MUON COLLIDER  

E-Print Network [OSTI]

MERCURY HANDLING FOR THE TARGET SYSTEM FOR A MUON COLLIDER Van Graves , ORNL, Oak Ridge, TN 37830 Factory is a free-stream mercury jet within a 20-T magnetic field being impacted by an 8-GeV proton beam. A pool of mercury serves as a receiving reservoir for the mercury and a dump for the unexpended proton

McDonald, Kirk

260

High-energy physics: New collider gets the nod  

Science Journals Connector (OSTI)

... suggestion made was that member states might temporarily forgo about one half of a special rebate that has become payable this year with the accession to the organization of Spain. ... that has become payable this year with the accession to the organization of Spain. The rebate would instead be made upon the completion of LEP, CERN's electron-positron collider ...

Tim Beardsley

1983-12-22T23:59:59.000Z

Note: This page contains sample records for the topic "level linear collider" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


261

PROTON BEAM REQUIREMENTS FOR A NEUTRINO FACTORY AND MUON COLLIDER  

SciTech Connect (OSTI)

Both a Neutrino Factory and a Muon Collider place stringent demands on the proton beam used to generate the desired beam of muons. Here we discuss the advantages and challenges of muon accelerators and the rationale behind the requirements on proton beam energy, intensity, bunch length, and repetition rate. Example proton driver configurations that have been considered in recent years are also briefly indicated.

Zisman, Michael S.

2009-12-11T23:59:59.000Z

262

AN INTENSE LOW ENERGY MUON SOURCE FOR THE MUON COLLIDER  

E-Print Network [OSTI]

AN INTENSE LOW ENERGY MUON SOURCE FOR THE MUON COLLIDER D. Taqqu Paul Scherrer Institut, Villigen, CH Abstract A scheme for obtaining an intense source of low energy muons is described. It is based of the decay muons an intense intermediate energy muon beam is obtained. For the specific case of negative

McDonald, Kirk

263

VEPP-2000 COLLIDER CONTROL SYSTEM* A.Senchenko1,#  

E-Print Network [OSTI]

, Russia Abstract Electron-positron collider VEPP-2000 has been commissioned at Budker Institute of Nuclear of quadrupole. To avoid dispersion in the detectors, RF cavity and injection straights, a pair of dipoles families of sextupole magnets located in the technical straight section, where the dispersion is high

Kozak, Victor R.

264

Fusion Reactions in Self-Colliding Orbits  

Science Journals Connector (OSTI)

A principle for a small nonplasma fusion device is proposed. Energetic ions are injected through the center of a Precetron-type magnetic field. An organized non-Maxwellian mixture ("migma") of particles having a central high-density region results. The collisions are predominantly head-on and Coulomb scattering effects significantly reduced. It is shown that the device can become critical, although, in the examples considered here, only at microwatt levels.

Bogdan C. Magli?; John P. Blewett; Anthony P. Colleraine; W. Craig Harrison

1971-10-04T23:59:59.000Z

265

Using Linearity Web Copyright 2007  

E-Print Network [OSTI]

Using Linearity Web Rev. 2.0 May 2007 Copyright © 2007 #12;Using Linearity Web i Contents Introduction to Linearity Web.............................................................................1 Features, Benefits, and Value of Linearity Web..............................................1 Before You

Rodriguez, Carlos

266

Muon Collider R&D at Princeton Shoibal Chakravarty (graduate student)  

E-Print Network [OSTI]

Muon Collider R&D at Princeton Shoibal Chakravarty (graduate student) Hulya Guler (undergraduate) Changguo Lu Kirk McDonald Eric Prebys Sven Vahsen (graduate student) [Members of the Muon Collider Advisory Council Meeting Princeton Muon Collider page: http://puhep1.princeton.edu/mumu/ 1 #12; What

McDonald, Kirk

267

MUON COLLIDER PROGRESS Robert B. Palmer (BNL, Upton, Long Island, New York)  

E-Print Network [OSTI]

MUON COLLIDER PROGRESS Robert B. Palmer (BNL, Upton, Long Island, New York) Abstract A complete scheme for muon production, cooling, ac- celeration and storage in a collider ring is presented. Pa- rameters for two muon colliders are given. Both start with pion production on a mercury target. A capture

McDonald, Kirk

268

Time evolution of colliding laser produced magnesium plasmas investigated using a pinhole camera  

E-Print Network [OSTI]

suitable conditions for x-ray amplification in a laser produced plasma.24 When two plasmas collide, variTime evolution of colliding laser produced magnesium plasmas investigated using a pinhole camera S for publication 14 February 2001 Time resolved studies of colliding laser produced magnesium plasmas are performed

Harilal, S. S.

269

Physics and Analysis at a Hadron Collider - An Introduction (1/3)  

ScienceCinema (OSTI)

This is the first lecture of three which together discuss the physics of hadron colliders with an emphasis on experimental techniques used for data analysis. This first lecture provides a brief introduction to hadron collider physics and collider detector experiments as well as offers some analysis guidelines. The lectures are aimed at graduate students.

None

2011-10-06T23:59:59.000Z

270

Radiation damage considerations in a high luminosity collider: The interaction region  

SciTech Connect (OSTI)

The interaction region in a high luminosity collider will be a source of radiation for all components in the vicinity and will place stringent requirements on their design. The major components in the vicinity and will place stingent requirements on their design. The major components in the vicinity of the interaction region are the physics detectors that surround the beam pipe and the focusing quadrupole magnets nearby. We will present the radiation levels in such a physics detector and the power in the forward direction that will be deposited in the forward calorimeters and quad magnets. The implications of the levels on a variety of detector components and electronics will be presented. The calculational techniques and limitation will be reviewed.

Lee, D.M.

1992-01-01T23:59:59.000Z

271

Radiation damage considerations in a high luminosity collider: The interaction region  

SciTech Connect (OSTI)

The interaction region in a high luminosity collider will be a source of radiation for all components in the vicinity and will place stringent requirements on their design. The major components in the vicinity and will place stingent requirements on their design. The major components in the vicinity of the interaction region are the physics detectors that surround the beam pipe and the focusing quadrupole magnets nearby. We will present the radiation levels in such a physics detector and the power in the forward direction that will be deposited in the forward calorimeters and quad magnets. The implications of the levels on a variety of detector components and electronics will be presented. The calculational techniques and limitation will be reviewed.

Lee, D.M.

1992-10-01T23:59:59.000Z

272

Next generation Higgs bosons: Theory, constraints, and discovery prospects at the Large Hadron Collider  

Science Journals Connector (OSTI)

Particle physics model building within the context of string theory suggests that further copies of the Higgs boson sector may be expected. Concerns regarding tree-level flavor-changing neutral currents are easiest to allay if little or no couplings of next generation Higgs bosons to standard model fermions are allowed. We detail the resulting general Higgs potential and mass spectroscopy in both a standard model extension and a supersymmetric extension. We present the important experimental constraints from meson-meson mixing, loop-induced b?s? decays, and LEP2 direct production limits. We investigate the energy range of the valid perturbation theory of these ideas. In the supersymmetric context we present a class of examples that marginally aids the fine-tuning problem for parameter space where the lightest Higgs boson mass is greater than the standard model limit of 114GeV. Finally, we study collider physics signatures generic to next generation Higgs bosons, with special emphasis on Ah?hhZ?4b+2l signal events, and describe the capability of discovery at the Large Hadron Collider.

Rick S. Gupta and James D. Wells

2010-03-30T23:59:59.000Z

273

Measuring W photon couplings in a 500 GeV e sup + e sup - collider  

SciTech Connect (OSTI)

The Standard Model gives definite predictions for the W-photon couplings. Measuring them would test an important ingredient of the model. In this work we study the capability of a 500 GeV e{sup +}e{sup {minus}} collider to measure these couplings. We study the most general C and P conserving WW{lambda} vertex. This vertex contains two free parameters, {kappa} and {lambda}. We look at three processes: e{sup +}e{sup {minus}} {yields} W{sup +}W{sup {minus}}, e{lambda} {yields} W{nu} and {lambda}{lambda} {yields} W{sup +}W{sup {minus}}. For each process we present analytical expressions of helicity amplitudes for arbitrary values of {kappa} and {lambda}. We consider three different sources for the initial photon(s). The first two are breamsstrahlung and beamstrahlung (photon radiation induced by the collective fields of the opposite bunch). Both occur naturally in the collider environment. The third is a photon beam generated by scattering low energy laser light off a high energy electron beam. We examine potential observables for each process, calculating their sensitivity to {kappa} and {lambda}, and estimating the accuracy with which they can be measured. Assuming Standard Model values are actually measured, we present the region in the {kappa}-{lambda} plane to which the W couplings can be restricted with a given confidence level. We find that combining the three processes, one can measure {kappa} and {lambda} with accuracy of 0.01--0.02.

Yehudai, E.

1991-08-01T23:59:59.000Z

274

Proceedings of the 1992 workshops on high-energy physics with colliding beams. Volume 1, Search for new phenomena at colliding-beam facilities  

SciTech Connect (OSTI)

This report contains brief papers and viewgraphs on high energy topics like: supersymmetry; new gauge bosons; and new high energy colliders.

Rogers, J. [ed.

1992-12-31T23:59:59.000Z

275

Collider signatures of the SO(5)xU(1) gauge-Higgs unification  

SciTech Connect (OSTI)

Collider signatures of the SO(5)xU(1) gauge-Higgs unification model in the Randall-Sundrum warped space are explored. Gauge couplings of quarks and leptons receive small corrections from the fifth dimension whose effects are tested by the precision data. It is found that the forward-backward asymmetries in e{sup +}e{sup -} collisions on the Z pole are well explained in a wide range of the warp factor z{sub L}, but the model is consistent with the branching fractions of Z decay only for large z{sub L} > or approx. 10{sup 15}. Kaluza-Klein (KK) spectra of gauge bosons, quarks, and leptons as well as gauge and Higgs couplings of low-lying KK excited states are determined. Right-handed quarks and leptons have larger couplings to the KK gauge bosons than left-handed ones. Production rates of Higgs bosons and KK states at the Tevatron, LHC, and International Linear Collider are evaluated. The first KK Z has a mass 1130 GeV with a width 422 GeV for z{sub L}=10{sup 15}. The current limit on the Z' production at the Tevatron and LHC indicates z{sub L}>10{sup 15}. A large effect of parity violation appears in the difference between the rapidity distributions of e{sup +} and e{sup -} in the decay of the first KK Z. The first KK gauge bosons decay into light and heavy quarks evenly.

Hosotani, Yutaka; Tanaka, Minoru; Uekusa, Nobuhiro [Department of Physics, Osaka University, Toyonaka, Osaka 560-0043 (Japan)

2011-10-01T23:59:59.000Z

276

Syntactic edges and linearization  

E-Print Network [OSTI]

In this thesis, I investigate the question of how the units of a linguistic expression are linearly ordered in syntax. In particular, I examine interactions between locality conditions on movement and the mapping between ...

Ko, Heejeong

2005-01-01T23:59:59.000Z

277

Microsoft Word - 2003-0820 RHIC collider projections.doc  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

RHIC Collider Projections (FY2004 - FY2008) RHIC Collider Projections (FY2004 - FY2008) Thomas Roser, Wolfram Fischer Last update: August 20, 2003 This note discusses in Part I possible operating modes for the RHIC Run-4 (FY2004) running period including constraints from cryogenic cool-down, machine set-up and beam commissioning. In Part II a 5-year projection is given for gold-gold and polarized proton collisions. Part I - Run-4 Projections Cryogenic operation - After the summer shutdown the two RHIC rings will be at room temperature. They will be first brought to liquid nitrogen temperature, in about 10 days. Then, two weeks will be required to cool down to 4 Kelvin. At the end of the run, one week of refrigerator operation is required for the warm-up to 80 Kelvin. Running modes - A number of running modes are considered in RHIC, such as Au-Au

278

Relativistic Heavy Ion Collider | The Case for Continuing Operations  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

The Case for Continuing RHIC Operations The Case for Continuing RHIC Operations The Relativistic Heavy Ion Collider (RHIC) - the nation's only remaining particle collider, located at Brookhaven National Laboratory - has made a series of landmark discoveries and continuing breakthroughs in science and technology. One major accomplishment has been RHIC's ability to recreate and study in detail a type of matter that last existed at the beginning of the universe to better understand the strongest force in nature - the force that holds together the fundamental particles that make up 99 percent of visible matter in the universe today, everything from stars to planets to people. In addition to giving us a new way to explore and understand the nature of the early universe and the force that holds together ordinary matter, research at RHIC has revealed stunning

279

R&D Toward a Neutrino Factory and Muon Collider  

SciTech Connect (OSTI)

There is considerable interest in the use of muon beams to create either an intense source of decay neutrinos aimed at a detector located 3000-7500 km away (a Neutrino Factory), or a Muon Collider that produces high-luminosity collisions at the energy frontier. R&D aimed at producing these facilities has been under way for more than 10 years. This paper will review experimental results from MuCool, MERIT, and MICE and indicate the extent to which they will provide proof-of-principle demonstrations of the key technologies required for a Neutrino Factory or Muon Collider. Progress in constructing components for the MICE experiment will also be described.

Zisman, Michael S

2009-04-29T23:59:59.000Z

280

Expectations for old and new physics at high energy colliders  

SciTech Connect (OSTI)

During the past year, the first data from the SPS collider at CERN have become available. The initial results are only a glimpse at a new energy regime and we can reasonably expect an increase in the extent of the data by a factor of 10/sup 4/ to 10/sup 5/. Moreover, within a few years, the Fermilab Tevatron Collider will be in operation with a center of mass energy nearly four times as great as that at CERN. Beyond these machines are other possibilities: a high luminosity pp machine at Brookhaven with a center of mass energy of 0.8 TeV; a p anti p or pp machine in the LEP tunnel at CERN; a desetron in the southwestern United States with many TeV in the center of mass. The purpose of these lectures is to provide an orientation for the wealth of data that these machines will provide.

Cahn, R.N.

1982-12-01T23:59:59.000Z

Note: This page contains sample records for the topic "level linear collider" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


281

Frictional Cooling Scheme for Use in a Muon Collider  

SciTech Connect (OSTI)

The Muon Group at the MPI for Physics, Munich is investigating frictional cooling as a fast muon-beam emittance reduction scheme for a muon collider. A new simulation package, CoolSim, based on Geant4 has been developed for the simulation of low-energy beam cooling. New physics processes for low energy muons and protons have been implemented in the Geant4 framework. The group's Frictional Cooling Demonstration experiment aims to verify the principle of the cooling scheme. For this purpose, a 10-cm-long cooling cell has been constructed to test simulation of the energy loss and scattering mechanisms at low energy. This paper contains an introduction to a muon-collider frictional cooling scheme and the status of the demonstration experiment.

Greenwald, Daniel; Caldwell, Allen [Max-Planck-Insitut fuer Physik, Foehringer Ring 6, 80805 Munich (Germany); Bao, Yu [Max-Planck-Insitut fuer Physik, Foehringer Ring 6, 80805 Munich (Germany); Institute of High Energy Physics, Chinese Academy of Sciences, Beijing (China)

2010-03-30T23:59:59.000Z

282

Audit of controls over Superconducting Super Collider Laboratory subcontractor expenditures  

SciTech Connect (OSTI)

In January 1989 the Department of Energy contracted with Universities Research Association, Inc. to design, construct, manage, operate, and maintain the Superconducting Super Collider Laboratory. Through Fiscal Year 1992, costs for subcontractor goods and services accounted for about 75 percent of the Superconducting Super Collider Laboratory expenditures. The Office of Inspector General evaluated the adequacy of controls in place to ensure that subcontractor costs were reasonable, as required by the contract. The following conclusions were drawn from the audit. The Superconducting Super Collider Laboratory did not consistently exercise prudent business judgment in making subcontractor expenditures. As a result, $60 million in expenditures already made and $128 million planned with commercial subcontractors were, in the authors opinion, unnecessary, excessive, or represented uncontrolled growth. The audit also found inadequate justifications, accountability, and cost controls over $143 million in expenditures made and $47 million planned with other Department of Energy laboratories. Improvements were needed in subcontract administration and internal controls, including appropriate audit coverage of the subcontracts. In addition, Department of Energy guidance concerning procurement actions between the laboratories needed to be established.

Not Available

1993-10-22T23:59:59.000Z

283

Energy calibration at high-energy photon colliders  

E-Print Network [OSTI]

Calibration of the absolute energy scale at high-energy photon (gamma-gamma, gamma-electron) colliders is discussed. The luminosity spectrum at photon colliders is broad and has a rather sharp high-energy edge, which can be used, for example, to measure the mass of the Higgs boson in the process gamma-gamma to H or masses of charged scalars by observing the cross-section threshold. In addition to the precise knowledge of the edge energy of the luminosity spectrum, it is even more important to have a way to calibrate the absolute energy scale of the detector. At first sight, Compton scattering itself provides a unique way to determine the beam energies and produce particles of known energies that could be used for detector calibration. The energy scale is given by the electron mass m_e and laser photon energy \\omega_0. However, this does not work at realistic photon colliders due to large nonlinear effects in Compton scattering at the conversion region (\\xi^2 \\sim 0.3). It is argued that the process gamma-elec...

Telnov, V I

2014-01-01T23:59:59.000Z

284

Low-cost hadron colliders at Fermilab: A discussion paper  

SciTech Connect (OSTI)

New more economic approaches are required to continue the dramatic exponential rise in collider energies as represented by the well known Livingston plot. The old idea of low cost, low field iron dominated magnets in a small diameter pipe may become feasible in the next decade with dramatic recent advances in technology: (1) advanced tunneling technologies for small diameter, non human accessible tunnels, (2) accurate remote guidance systems for tunnel survey and boring machine steering, (3) high T{sub c} superconductors operating at liquid N{sub 2} or liquid H{sub 2} temperatures, (4) industrial applications of remote manipulation and robotics, (5) digitally multiplexed electronics to minimize cables, (6) achievement of high luminosities in p-p and p-{anti P} colliders. The goal of this paper is to stimulate continuing discussions on approaches to this new collider and to identify critical areas needing calculations, construction of models, proof of principle experiments, and full scale prototypes in order to determine feasibility and arrive at cost estimates.

Foster, G.W.; Malamud, E.

1996-06-21T23:59:59.000Z

285

Illuminating Dark Photons with High-Energy Colliders  

E-Print Network [OSTI]

High-energy colliders offer a unique sensitivity to dark photons, the mediators of a broken dark U(1) gauge theory that kinetically mixes with the Standard Model (SM) hypercharge. Dark photons can be detected in the exotic decay of the 125 GeV Higgs boson, h -> Z Z_D -> 4l, and in Drell-Yan events, pp -> Z_D -> ll. If the dark U(1) is broken by a hidden-sector Higgs mechanism, then mixing between the dark and SM Higgs bosons also allows the exotic decay h -> Z_D Z_D -> 4l. We show that the 14 TeV LHC and a 100 TeV proton-proton collider provide powerful probes of both exotic Higgs decay channels. In the case of kinetic mixing alone, direct Drell-Yan production offers the best sensitivity to Z_D, and can probe epsilon >~ 9 x 10^(-4) (4 x 10^(-4)) at the HL-LHC (100 TeV pp collider). The exotic Higgs decay h -> Z Z_D offers slightly weaker sensitivity, but both measurements are necessary to distinguish the kinetically mixed dark photon from other scenarios. If Higgs mixing is also present, then the decay h -> Z...

Curtin, David; Gori, Stefania; Shelton, Jessie

2014-01-01T23:59:59.000Z

286

Tapered Six-Dimensional Cooling Channel for a Muon Collider  

SciTech Connect (OSTI)

A high-luminosity muon collider requires a reduction of the six-dimensional emittance of the captured muon beam by a factor of {approx} 10{sup 6}. Most of this cooling takes place in a dispersive channel that simultaneously reduces all six phase space dimensions. We describe a tapered 6D cooling channel that should meet the requirements of a muon collider. The parameters of the channel are given and preliminary simulations are shown of the expected performance. A complete scheme for cooling a muon beam sufficiently for use in a muon collider has been previously described. This scheme uses separate 6D ionization cooling channels for the two signs of the particle charge. In each, a channel first reduces the emittance of a train of muon bunches until they can be injected into a bunch-merging system. The single muon bunches, one of each sign, are then sent through a second tapered 6D cooling channel where the transverse emittance is reduced as much as possible and the longitudinal emittance is cooled to a value below that needed for the collider. The beam can then be recombined and sent through a final cooling channel using high-field solenoids that cools the transverse emittance to the required values for the collider while allowing the longitudinal emittance to grow. This paper mainly describes the design of the 6D cooling channel before bunch merging. Cooling efficiency is conveniently measured using a parameter Q, which is defined as the rate of change of 6D emittance divided by the rate of change of the number of muons in the beam. In a given lattice Q starts off small due to losses from initial matching, then rises to a large value (Q {approx} 15 is typical for the channels discussed here), and finally falls as the emittance of the beam approaches its equilibrium value. The idea for the 6D cooling channel described here originated with the RFOFO cooling ring. This design evolved into a helical channel referred to as a 'Guggenheim' in order to avoid serious problems with injection of large emittance beams. We found that good cooling efficiency requires that the channel be tapered. In that case when Q starts to fall off the lattice is modified to reduce the beta function. This ensures that the beam emittance is always large compared with the equilibrium emittance.

Palmer, R.B.; Fernow, R.C.

2011-03-28T23:59:59.000Z

287

Exergy Analysis of the Cryogenic Helium Distribution System for the Large Hadron Collider (LHC)  

E-Print Network [OSTI]

The Large Hadron Collider (LHC) at CERN features the worlds largest helium cryogenic system, spreading over the 26.7 km circumference of the superconducting accelerator. With a total equivalent capacity of 145 kW at 4.5 K including 18 kW at 1.8 K, the LHC refrigerators produce an unprecedented exergetic load, which must be distributed efficiently to the magnets in the tunnel over the 3.3 km length of each of the eight independent sectors of the machine. We recall the main features of the LHC cryogenic helium distribution system at different temperature levels and present its exergy analysis, thus enabling to qualify second-principle efficiency and identify main remaining sources of irreversibility..

Claudet, S; Tavian, L; Wagner, U; 10.1063/1.3422294

2010-01-01T23:59:59.000Z

288

Heavy ion beam loss mechanisms at an electron-ion collider  

E-Print Network [OSTI]

There are currently several proposals to build a high-luminosity electron-ion collider, to study the spin structure of matter and measure parton densities in heavy nuclei, and to search for gluon saturation and new phenomena like the colored glass condensate. These measurements require operation with heavy-nuclei. We calculate the cross-sections for two important processes that will affect accelerator and detector operations: bound-free pair production, and Coulomb excitation of the nuclei. Both of these reactions have large cross-sections, 28-56 mb, which can lead to beam ion losses, produce beams of particles with altered charge:mass ratio, and produce a large flux of neutrons in zero degree calorimeters. The loss of beam particles limits the sustainable electron-ion luminosity to levels of several times $10^{32}/$cm$^2$/s.

Spencer R. Klein

2014-09-18T23:59:59.000Z

289

EXERGY ANALYSIS OF THE CRYOGENIC HELIUM DISTRIBUTION SYSTEM FOR THE LARGE HADRON COLLIDER (LHC)  

SciTech Connect (OSTI)

The Large Hadron Collider (LHC) at CERN features the world's largest helium cryogenic system, spreading over the 26.7 km circumference of the superconducting accelerator. With a total equivalent capacity of 145 kW at 4.5 K including 18 kW at 1.8 K, the LHC refrigerators produce an unprecedented exergetic load, which must be distributed efficiently to the magnets in the tunnel over the 3.3 km length of each of the eight independent sectors of the machine. We recall the main features of the LHC cryogenic helium distribution system at different temperature levels and present its exergy analysis, thus enabling to qualify second-principle efficiency and identify main remaining sources of irreversibility.

Claudet, S.; Lebrun, Ph.; Tavian, L.; Wagner, U. [CERN, CH-1211, Geneva, 23 (Switzerland)

2010-04-09T23:59:59.000Z

290

Reliability of Beam Loss Monitors System for the Large Hadron Collider  

E-Print Network [OSTI]

The employment of superconducting magnets, in the high energies colliders, opens challenging failure scenarios and brings new criticalities for the whole system protection. For the LHC beam loss protection system, the failure rate and the availability requirements have been evaluated using the Safety Integrity Level (SIL) approach. A downtime cost evaluation is used as input for the SIL approach. The most critical systems, which contribute to the final SIL value, are the dump system, the interlock system, the beam loss monitors system and the energy monitor system. The Beam Loss Monitors System (BLMS) is critical for short and intense particles losses, while at medium and higher loss time it is assisted by other systems, such as the quench protection system and the cryogenic system. For BLMS, hardware and software have been evaluated in detail. The reliability input figures have been collected using historical data from the SPS, using temperature and radiation damage experimental data as well as using standar...

Guaglio, Gianluca; Santoni, C

2004-01-01T23:59:59.000Z

291

Linear Logic as CSP  

Science Journals Connector (OSTI)

......research-article Original Articles Linear Logic as CSP ERIC MONTEIRO Department of Informatics...translation from such proofs into a corresponding CSP process is offered. It is shown that the...between the cut elimination process and the CSP execution. Generalizations and related......

ERIC MONTEIRO

1994-08-01T23:59:59.000Z

292

Linear Programming Environmental  

E-Print Network [OSTI]

Linear Program to control air pollution was developed in 1968 by Teller, which minimized cost Fall 2006 #12;Topics · Introduction · Background · Air · Land · Water #12;Introduction · "The United States spends more than 2% of its gross domestic product on pollution control, and this is more than any

Nagurney, Anna

293

Michael Schmitt Physics at a -Collider 15-March-2001 1 Physics at a -Collider  

E-Print Network [OSTI]

's { it is possible to prepare initial states of speci#12;c CP #15; Since photons couple only to electric charge mass charged particles can circulate, and sensitivity is not masked by a large SM tree level challenging. The cost comes in a broad energy distribution. (better than protons, inferior to electrons

Schmitt, Michael

294

Michael Schmitt Physics at a -Collider 20-March-2001 1 Physics at a -Collider  

E-Print Network [OSTI]

of speci#12;c CP #15; Since photons couple only to electric charge, production of neutral particles circulate, and sensitivity is not masked by a large SM tree level contribution. #12; Michael Schmitt Physics;. #15; Preparing the photon beam is experimentally challenging. The cost comes in a broad energy

Schmitt, Michael

295

HIGH-ENERGY PARTICLE COLLIDERS: PAST 20 YEARS, NEXT 20 YEARS, AND BEYOND  

SciTech Connect (OSTI)

Particle colliders for high-energy physics have been in the forefront of scientific discoveries for more than half a century. The accelerator technology of the colliders has progressed immensely, while the beam energy, luminosity, facility size, and cost have grown by several orders of magnitude. The method of colliding beams has not fully exhausted its potential but has slowed down considerably in its progress. This paper briefly reviews the colliding beam method and the history of colliders, discusses the development of the method over the last two decades in detail, and examines near-term collider projects that are currently under development. The paper concludes with an attempt to look beyond the current horizon and to find what paradigm changes are necessary

Shiltsev, V.

2013-09-25T23:59:59.000Z

296

High-energy Particle Colliders: Past 20 Years, Next 20 Years, And Beyond  

E-Print Network [OSTI]

Particle colliders for high-energy physics have been in the forefront of scientific discoveries for more than half a century. The accelerator technology of the colliders has progressed immensely, while the beam energy, luminosity, facility size, and cost have grown by several orders of magnitude. The method of colliding beams has not fully exhausted its potential but has slowed down considerably in its progress. This paper briefly reviews the colliding beam method and the history of colliders, discusses the development of the method over the last two decades in detail, and examines near-term collider projects that are currently under development. The paper concludes with an attempt to look beyond the current horizon and to find what paradigm changes are necessary for breakthroughs in the field.

Shiltsev, V

2014-01-01T23:59:59.000Z

297

Department of Energy assessment of the Large Hadron Collider  

SciTech Connect (OSTI)

This report summarizes the conclusions of the committee that assessed the cost estimate for the Large Hadron Collider (LHC). This proton-proton collider will be built at CERN, the European Laboratory for Particle Physics near Geneva, Switzerland. The committee found the accelerator-project cost estimate of 2.3 billion in 1995 Swiss francs, or about $2 billion US, to be adequate and reasonable. The planned project completion date of 2005 also appears achievable, assuming the resources are available when needed. The cost estimate was made using established European accounting procedures. In particular, the cost estimate does not include R and D, prototyping and testing, spare parts, and most of the engineering labor. Also excluded are costs for decommissioning the Large Electron-Positron collider (LEP) that now occupies the tunnel, modifications to the injector system, the experimental areas, preoperations costs, and CERN manpower. All these items are assumed by CERN to be included in the normal annual operations budget rather than the construction budget. Finally, contingency is built into the base estimate, in contrast to Department of Energy (DOE) estimates that explicitly identify contingency. The committee`s charge, given by Dr. James F. Decker, Deputy Directory of the DOE Office of Energy Research, was to understand the basis for the LHC cost estimate, identify uncertainties, and judge the overall validity of the estimate, proposed schedule, and related issues. The committee met at CERN April 22--26, 1996. The assessment was based on the October 1995 LHC Conceptual Design Report or ``Yellow Book,`` cost estimates and formal presentations made by the CERN staff, site inspection, detailed discussions with LHC technical experts, and the committee members` considerable experience.

NONE

1996-06-01T23:59:59.000Z

298

Control Surveys for Underground Construction of the Superconducting Super Collider  

SciTech Connect (OSTI)

Particular care had to be taken in the design and implementation of the geodetic control systems for the Superconducting Super Collider (SSC) due to stringent accuracy requirements, the demanding tunneling schedule, long duration and large size of the construction effort of the project. The surveying requirements and the design and implementation of the surface and underground control scheme for the precise location of facilities which include approximately 120 km of bored tunnel are discussed. The methodology used for the densification of the surface control networks, the technique used for the transfer of horizontal and vertical control into the underground facilities, and the control traverse scheme employed in the tunnels is described.

Greening, W.J.Trevor; Robinson, Gregory L.; /Measurment Science Inc.; Robbins, Jeffrey S.; Ruland, Robert E.; /SLAC

2005-08-16T23:59:59.000Z

299

Muon capture for the front end of a muon collider  

SciTech Connect (OSTI)

We discuss the design of the muon capture front end for a {mu}{sup +}-{mu}{sup -} Collider. In the front end, a proton bunch on a target creates secondary pions that drift into a capture transport channel, decaying into muons. A sequence of rf cavities forms the resulting muon beams into strings of bunches of differing energies, aligns the bunches to (nearly) equal central energies, and initiates ionization cooling. The muons are then cooled and accelerated to high energy into a storage ring for high-energy high luminosity collisions. Our initial design is based on the somewhat similar front end of the International Design Study (IDS) neutrino factory.

Neuffer, D.; /Fermilab; Yoshikawa, C.; /MUONS Inc., Batavia

2011-03-01T23:59:59.000Z

300

Calorimetry for Lepton Collider Experiments - CALICE results and activities  

E-Print Network [OSTI]

The CALICE collaboration conducts calorimeter R&D for highly granular calorimeters, mainly for their application in detectors for a future lepton collider at the TeV scale. The activities ranges from generic R&D with small devices up to extensive beam tests with prototypes comprising up to several 100000 calorimeter cells. CALICE has validated the performance of particle flow algorithms with test beam data and delivers the proof of principle that highly granular calorimeters can be built, operated and understood. The successes achieved in the past years allows the step from prototypes to calorimeter systems for particle physics detectors to be addressed.

,

2012-01-01T23:59:59.000Z

Note: This page contains sample records for the topic "level linear collider" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


301

Calorimetry for Lepton Collider Experiments - CALICE results and activities  

E-Print Network [OSTI]

The CALICE collaboration conducts calorimeter R&D for highly granular calorimeters, mainly for their application in detectors for a future lepton collider at the TeV scale. The activities ranges from generic R&D with small devices up to extensive beam tests with prototypes comprising up to several 100000 calorimeter cells. CALICE has validated the performance of particle flow algorithms with test beam data and delivers the proof of principle that highly granular calorimeters can be built, operated and understood. The successes achieved in the past years allows the step from prototypes to calorimeter systems for particle physics detectors to be addressed.

The CALICE Collaboration

2012-12-20T23:59:59.000Z

302

Complementarity between collider, direct detection, and indirect detection experiments  

E-Print Network [OSTI]

We examine the capabilities of planned direct detection, indirect detection, and collider experiments in exploring the 19-parameter p(henomenological)MSSM, focusing on the complementarity between the different search techniques. In particular, we consider dark matter searches at the 7, 8 (and eventually 14) TeV LHC, \\Fermi, CTA, IceCube/DeepCore, and LZ. We see that the search sensitivities depend strongly on the WIMP mass and annihilation mechanism, with the result that different search techniques explore orthogonal territory. We also show that advances in each technique are necessary to fully explore the space of Supersymmetric WIMPs.

Matthew Cahill-Rowley

2014-11-12T23:59:59.000Z

303

Radio emission from Colliding-Wind Binaries: Observations and Models  

E-Print Network [OSTI]

We have developed radiative transfer models of the radio emission from colliding-wind binaries (CWB) based on a hydrodynamical treatment of the wind-collision region (WCR). The archetype of CWB systems is the 7.9-yr period binary WR140, which exhibits dramatic variations at radio wavelengths. High-resolution radio observations of WR140 permit a determination of several system parameters, particularly orbit inclination and distance, that are essential for any models of this system. A model fit to data at orbital phase 0.9 is shown, and some short comings of our model described.

S. M. Dougherty; J. M. Pittard; E. P. O'Connor

2005-10-18T23:59:59.000Z

304

SINGLE CRYSTAL NIOBIUM TUBES FOR PARTICLE COLLIDERS ACCELERATOR CAVITIES  

SciTech Connect (OSTI)

The objective of this research project is to produce single crystal niobium (Nb) tubes for use as particle accelerator cavities for the Fermi laboratorys International Linear Collider project. Single crystal Nb tubes may have superior performance compared to a polycrystalline tubes because the absence of grain boundaries may permit the use of higher accelerating voltages. In addition, Nb tubes that are subjected to the high temperature, high vacuum crystallization process are very pure and well annealed. Any impurity with a significantly higher vapor pressure than Nb should be decreased by the relatively long exposure at high temperature to the high vacuum environment. After application of the single crystal process, the surfaces of the Nb tubes are bright and shiny, and the tube resembles an electro polished Nb tube. For these reasons, there is interest in single crystal Nb tubes and in a process that will produce single crystal tubes. To convert a polycrystalline niobium tube into a single crystal, the tube is heated to within a few hundred ?C of the melting temperature of niobium, which is 2477 ?C. RF heating is used to rapidly heat the tube in a narrow zone and after reaching the operating temperature, the hot zone is slowly passed along the length of the tube. For crystallization tests with Nb tubes, the traverse rate was in the range of 1-10 cm per hour. All the crystallization tests in this study were performed in a water-cooled, stainless steel chamber under a vacuum of 5 x10-6 torr or better. In earliest tests of the single crystal growth process, the Nb tubes had an OD of 1.9 cm and a wall thickness of 0.15 mm. With these relatively small Nb tubes, the single crystal process was always successful in producing single crystal tubes. In these early tests, the operating temperature was normally maintained at 2200 ?C, and the traverse rate was 5 cm per hour. In the next test series, the Nb tube size was increased to 3.8 cm OD and the wall thickness was increased 0.18 mm and eventually to 0.21 mm. Again, with these larger tubes, single crystal tubes were usually produced by the crystallization process. The power supply was generally operated at full output during these tests, and the traverse rate was 5 cm per hour. In a few tests, the traverse rate was increased to 10 cm per hour, and at the faster traverse rate, single crystal growth was not achieved. In these tests with a faster traverse rate, it was thought that the tube was not heated to a high enough temperature to achieve single crystal growth. In the next series of tests, the tube OD was unchanged at 3.8 cm and the wall thickness was increased to 0.30 mm. The increased wall thickness made it difficult to reach an operating temperature above 2,000 ?C, and although the single crystal process caused a large increase in the crystal grains, no single crystal tubes were produced. It was assumed that the operating temperature in these tests was not high enough to achieve single crystal growth. In FY 2012, a larger power supply was purchased and installed. With the new power supply, temperatures above the melting point of Nb were easily obtained regardless of the tube thickness. A series of crystallization tests was initiated to determine if indeed the operating temperature of the previous tests was too low to achieve single crystal growth. For these tests, the Nb tube OD remained at 3.8 cm and the wall thickness was 0.30 mm. The first test had an operating temperature of 2,000 ?C. and the operating temperature was increased by 50 ?C increments for each successive test. The final test was very near the Nb melting temperature, and indeed, the Nb tube eventually melted in the center of the tube. These tests showed that higher temperatures did yield larger grain sizes if the traverse rate was held constant at 5 cm per hour, but no single crystal tubes were produced even at the highest operating temperature. In addition, slowing the traverse rate to as low as 1 cm per hour did not yield a single crystal tube regardless of operating temperature. At this time, it

MURPHY, JAMES E [University of Nevada, Reno] [University of Nevada, Reno

2013-02-28T23:59:59.000Z

305

Non-linear dark energy clustering  

SciTech Connect (OSTI)

We consider a dark energy fluid with arbitrary sound speed and equation of state and discuss the effect of its clustering on the cold dark matter distribution at the non-linear level. We write the continuity, Euler and Poisson equations for the system in the Newtonian approximation. Then, using the time renormalization group method to resum perturbative corrections at all orders, we compute the total clustering power spectrum and matter power spectrum. At the linear level, a sound speed of dark energy different from that of light modifies the power spectrum on observationally interesting scales, such as those relevant for baryonic acoustic oscillations. We show that the effect of varying the sound speed of dark energy on the non-linear corrections to the matter power spectrum is below the per cent level, and therefore these corrections can be well modelled by their counterpart in cosmological scenarios with smooth dark energy. We also show that the non-linear effects on the matter growth index can be as large as 1015 per cent for small scales.

Anselmi, Stefano; Ballesteros, Guillermo [Dipartimento di Fisica ''G. Galilei'', Universit degli Studi di Padova, via Marzolo 8, I-35131 Padua (Italy); Pietroni, Massimo, E-mail: anselmi@pd.infn.it, E-mail: ballesteros@pd.infn.it, E-mail: pietroni@pd.infn.it [INFN Sezione di Padova, via Marzolo 8, I-35131 Padua (Italy)

2011-11-01T23:59:59.000Z

306

Linear induction accelerator  

DOE Patents [OSTI]

A linear induction accelerator includes a plurality of adder cavities arranged in a series and provided in a structure which is evacuated so that a vacuum inductance is provided between each adder cavity and the structure. An energy storage system for the adder cavities includes a pulsed current source and a respective plurality of bipolar converting networks connected thereto. The bipolar high-voltage, high-repetition-rate square pulse train sets and resets the cavities. 4 figs.

Buttram, M.T.; Ginn, J.W.

1988-06-21T23:59:59.000Z

307

Combustion powered linear actuator  

DOE Patents [OSTI]

The present invention provides robotic vehicles having wheeled and hopping mobilities that are capable of traversing (e.g. by hopping over) obstacles that are large in size relative to the robot and, are capable of operation in unpredictable terrain over long range. The present invention further provides combustion powered linear actuators, which can include latching mechanisms to facilitate pressurized fueling of the actuators, as can be used to provide wheeled vehicles with a hopping mobility.

Fischer, Gary J. (Albuquerque, NM)

2007-09-04T23:59:59.000Z

308

A Level-3 Reformulation-Linearization Technique Based Bound for ...  

E-Print Network [OSTI]

Acknowledgements: This material is based upon work supported by the National ..... selection of the exponential rate for the annealing schedule, which affects...

Peter Hahn

2009-07-19T23:59:59.000Z

309

Towards a compensatable Muon Collider calorimeter with manageable backgrounds  

SciTech Connect (OSTI)

Muon Collider detectors pose very challenging problems in detector technology due to extremely large backgrounds present in the detector volume as a result of muon decays. Current designs of a 750 GeV/c per beam Muon Collider envisage 4.28 x 10{sup 5} muon decays per meter in the beam pipe close to the interaction region. The decay electrons after intense shielding still manage to produce large backgrounds in the detector volume of low energy photons, neutrons and higher energy Bethe Heitler muons. There are 170/184/6.8/177 TeVs energy entering the detector volume per crossing due to EM particles/Muons/Mesons/Baryons respectively. We investigate the capabilities of an iron calorimeter with pixelated readout where each pixel gives a yes/no answer as to whether a charged particle passed through it or not, to solve this problem. Each pixel is individually triggered by a 'travelling gate trigger' with a gate of 2 ns where the beginning of the gate is the time of arrival of a light signal from the interaction region to the pixel. We show that such a calorimeter is compensatable and propose two schemes to compensate the digital output in software to improve the resolution of the calorimeter. We show that such a calorimeter is capable of digitizing physics signals from the interaction region and as a result, the backgrounds from the muon decays are much reduced and under control.

Raja, R.; /Fermilab

2012-04-01T23:59:59.000Z

310

Numerical heat conduction in hydrodynamical models of colliding hypersonic flows  

E-Print Network [OSTI]

Hydrodynamical models of colliding hypersonic flows are presented which explore the dependence of the resulting dynamics and the characteristics of the derived X-ray emission on numerical conduction and viscosity. For the purpose of our investigation we present models of colliding flow with plane-parallel and cylindrical divergence. Numerical conduction causes erroneous heating of gas across the contact discontinuity which has implications for the rate at which the gas cools. We find that the dynamics of the shocked gas and the resulting X-ray emission are strongly dependent on the contrast in the density and temperature either side of the contact discontinuity, these effects being strongest where the postshock gas of one flow behaves quasi-adiabatically while the postshock gas of the other flow is strongly radiative. Introducing additional numerical viscosity into the simulations has the effect of damping the growth of instabilities, which in some cases act to increase the volume of shocked gas and can re-he...

Parkin, E R

2010-01-01T23:59:59.000Z

311

Discovery Mass Reach for Excited Quarks at Hadron Colliders  

E-Print Network [OSTI]

If quarks are composite particles then excited states are expected. We estimate the discovery mass reach as a function of integrated luminosity for excited quarks decaying to dijets at the Tevatron, LHC, and a Very Large Hadron Collider (VLHC). At the Tevatron the mass reach is 0.94 TeV for Run II (2 fb^-1) and 1.1 TeV for TeV33 (30 fb^-1). At the LHC the mass reach is 6.3 TeV for 100 fb^-1. At a VLHC with a center of mass energy, sqrt(s), of 50 TeV (200 TeV) the mass reach is 25 TeV (78 TeV) for an integrated luminosity of 10^4 fb^-1. However, an excited quark with a mass of 25 TeV would be discovered at a hadron collider with sqrt(s)=100 TeV and an integrated luminosity of 13 fb^-1, illustrating a physics example where a factor of 2 in machine energy is worth a factor of 1000 in luminosity.

Robert M. Harris

1996-09-11T23:59:59.000Z

312

Highly Polarized Ion Sources for Electron Ion Colliders (EIC)  

SciTech Connect (OSTI)

The operation of the RHIC facility at BNL and the Electron Ion Colliders (EIC) under development at Jefferson Laboratory and BNL need high brightness ion beams with the highest polarization. Charge exchange injection into a storage ring or synchrotron and Siberian snakes have the potential to handle the needed polarized beam currents, but first the ion sources must create beams with the highest possible polarization to maximize collider productivity, which is proportional to a high power of the polarization. We are developing one universal H-/D- ion source design which will synthesize the most advanced developments in the field of polarized ion sources to provide high current, high brightness, ion beams with greater than 90% polarization, good lifetime, high reliability, and good power efficiency. The new source will be an advanced version of an atomic beam polarized ion source (ABPIS) with resonant charge exchange ionization by negative ions. An integrated ABPIS design will be prepared based on new materials and an optimized magnetic focusing system. Polarized atomic and ion beam formation, extraction, and transport for the new source will be computer simulated.

V.G. Dudnikov, R.P. Johnson, Y.S. Derbenev, Y. Zhang

2010-03-01T23:59:59.000Z

313

Hydrodynamic simulations of the colliding winds in Iota Orionis Julian M. Pittard*  

E-Print Network [OSTI]

Hydrodynamic simulations of the colliding winds in Iota Orionis Julian M. Pittard* School simulations of the colliding winds in the eccentric binary Iota Orionis (HR 1889; HD 37043) have been conducted. With the inclusion of radiative driving, the realistic simulation of such a system becomes

Pittard, Julian

314

DESIGN OF THE MERCURY HANDLING SYSTEM FOR A MUON COLLIDER/NEUTRINO FACTORY TARGET  

E-Print Network [OSTI]

DESIGN OF THE MERCURY HANDLING SYSTEM FOR A MUON COLLIDER/NEUTRINO FACTORY TARGET (IPAC13, THPFI092) The baseline target concept for a Muon Collider or Neutrino Factory is a free mercury jet within a 20-T magnetic field being impacted by an 8-GeV proton beam. A pool of mercury serves as a receiving reservoir

McDonald, Kirk

315

Measurement of the radiation field surrounding the Collider Detector at Fermilab  

SciTech Connect (OSTI)

We present here the first direct and detailed measurements of the spatial distribution of the ionizing radiation surrounding a hadron collider experiment. Using data from two different exposures we measure the effect of additional shielding on the radiation field around the Collider Detector at Fermilab (CDF). Employing a simple model we parameterize the ionizing radiation field surrounding the detector.

K. Kordas et al.

2004-01-28T23:59:59.000Z

316

The Neutrino Factory and Muon Collider Collaboration Physics Opportunities with Muon Beams  

E-Print Network [OSTI]

The Neutrino Factory and Muon Collider Collaboration Physics Opportunities with Muon Beams: Neutrino Factories and Muon Colliders p Source, 8­24 GeV, 1­4MW A Neutrino Factory based on a Muon Storage Linac 2 ­ 50 GeV Recirculating Linac 50­GeV Muon Storage Ring ~ 1km circumference Neutrino Beam to Near

McDonald, Kirk

317

OPTIMIZING MUON CAPTURE AND TRANSPORT FOR A NEUTRINO FACTORY/MUON COLLIDER FRONT END  

E-Print Network [OSTI]

OPTIMIZING MUON CAPTURE AND TRANSPORT FOR A NEUTRINO FACTORY/MUON COLLIDER FRONT END Hisham K In the current baseline scheme of the Neutrino Fac- tory/Muon Collider a muon beam from pion decay is pro- duced of the field along the beam, were varied to maximize the number of muons delivered to the Cooling Channel

McDonald, Kirk

318

The Neutrino Factory and Muon Collider Collaboration Physics Opportunities with Muon Beams  

E-Print Network [OSTI]

The Neutrino Factory and Muon Collider Collaboration Physics Opportunities with Muon Beams: Neutrino Factories and Muon Colliders p Source, 8-24 GeV, 1-4MW A Neutrino Factory based on a Muon StorageV Recirculating Linac 50-GeV Muon Storage Ring ~ 1km circumference Neutrino Beam to Near Detector Neutrino Beam

McDonald, Kirk

319

2780 IEEE TRANSACTIONS ON PLASMA SCIENCE, VOL. 39, NO. 11, NOVEMBER 2011 Jetlike Emission From Colliding  

E-Print Network [OSTI]

attractive applications in the field of X-ray lasers, pulsed-laser deposition (PLD), extreme ultraviolet Colliding Laser-Produced Plasmas Sivanandan S. Harilal, Mathew P. Polek, and Ahmed Hassanein, Member, IEEE Abstract--We report a large jetlike collimated emission feature from colliding laser-produced plasmas (LPPs

Harilal, S. S.

320

Measurement of the W Boson Mass With the Collider Detector at Fermilab  

E-Print Network [OSTI]

Measurement of the W Boson Mass With the Collider Detector at Fermilab A thesis presented by Andrew With the Collider Detector at Fermilab Andrew Scott Gordon Thesis Advisor: Melissa Franklin Abstract We measure at Fermilab from pp collisions at ps = 1800 GeV. The data weretaken from January 1994 through July 1995

Weitz, David

Note: This page contains sample records for the topic "level linear collider" from the National Library of EnergyBeta (NLEBeta).
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321

Study of the Fundamental Structure of Matter with an Electron-Ion Collider  

E-Print Network [OSTI]

We present an overview of the scientific opportunities that would be offered by a high-energy electron-ion collider. We discuss the relevant physics of polarized and unpolarized electron-proton collisions and of electron-nucleus collisions. We also describe the current accelerator and detector plans for a future electron-ion collider.

Abhay Deshpande; Richard Milner; Raju Venugopalan; Werner Vogelsang

2005-06-15T23:59:59.000Z

322

Activation of the liquid helium contamination during its passage in the Collider ring  

SciTech Connect (OSTI)

Radioactivation of possible contamination of the liquid helium trapped in the arcs of the Collider ring of the Superconducting Super Collider and transported by the liquid helium is estimated. This estimation is used to calculate the dose rate on the filter of the refrigerator plant located at the top of the shaft.

Lopez, G.

1994-01-01T23:59:59.000Z

323

Abstract--In order to develop precision vertex detectors for the future linear collider, fast active monolithic active pixel sensors  

E-Print Network [OSTI]

-to-voltage conversion factors were obtained using amplifiers with different gains or diode sizes. Pixel architectures in future vertex detectors of high energy physics experiments. The maximum charge-to-voltage conversion with DC and AC coupling to charge sensing element were proposed. As far, hits from conversion of 55 Fe

Paris-Sud XI, Université de

324

Linear Fresnel | Department of Energy  

Office of Energy Efficiency and Renewable Energy (EERE) Indexed Site

Linear Fresnel systems, which are a type of linear concentrator, are active in Germany, Spain, Australia, India, and the United States. The SunShot Initiative funds R&D on...

325

History of Proton Linear Accelerators  

E-Print Network [OSTI]

the board to show why the accelerator couldn't work. Then atmuch. References 1. Linear Accelerators, edited by P. M .at the 1986 Linear Accelerator Conference, SLAC, Stanford,

Alvarez, Luis W.

1986-01-01T23:59:59.000Z

326

Home of eRHIC: the Electron-Ion-Collider at BNL  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

Electron Ion Collider (EIC) Project Web Page Electron Ion Collider (EIC) Project Web Page This webpage is perpetually under construction October 26, 2007 (Maintained by Abhay Deshpande) A high luminosity polarized e-p/He and unpolarized e-A collider to study the hyperfine structure of the nucleon including (spin and flavor) and to explore nuclear matter at high parton densities. EIC Collaboration WebPage EIC Meeting at SBU, December 7-8, 2007 The most recent meeting: EICC meeting at MIT, May 2007 A Joint EIC2006 (Third Electron Ion Collider) and Hot-QCD Workshop hosted by BNL, July 17-22, 2006 eRHIC Related Papers and other Material White Papers & other information and documents for NSAC Long Range Planning 2007 Study of fundamental structure of matter with an electron-ion collider, A.

327

High energy particle colliders: past 20 years, next 20 years and beyond  

SciTech Connect (OSTI)

Particle colliders for high energy physics have been in the forefront of scientific discoveries for more than half a century. The accelerator technology of the collider has progressed immensely, while the beam energy, luminosity, facility size and the cost have grown by several orders of magnitude. The method of colliding beams has not fully exhausted its potential but its pace of progress has greatly slowed down. In this paper we very briefly review the method and the history of colliders, discuss in detail the developments over the past two decades and the directions of the R and D toward near future colliders which are currently being explored. Finally, we make an attempt to look beyond the current horizon and outline the changes in the paradigm required for the next breakthroughs.

Shiltsev, Vladimir D.; /Fermilab

2012-04-01T23:59:59.000Z

328

History of Proton Linear Accelerators  

DOE R&D Accomplishments [OSTI]

Some personal recollections are presented that relate to the author`s experience developing linear accelerators, particularly for protons. (LEW)

Alvarez, L. W.

1987-01-00T23:59:59.000Z

329

Single Anomalous Production of the Fourth SM Family Quarks at Future e+e-, ep, and pp Colliders  

SciTech Connect (OSTI)

Possible single productions of fourth SM family u4 and d4 quarks via anomalous interactions at the e+e-, ep, and pp colliders are investigated. Signatures of such anomalous processes are discussed at above colliders comparatively.

Ciftci, A. K. [Physics Department, Faculty of Sciences, Ankara University, 06100 Tandogan, Ankara (Turkey); Ciftci, R. [Physics Department, Faculty of Sciences and Arts, Gazi University, 06500 Teknikokullar, Ankara (Turkey); Sultansoy, S. [Physics Department, Faculty of Sciences and Arts, Gazi University, 06500 Teknikokullar, Ankara (Turkey); Institute of Physics, Academy of Sciences, H.Cavid Avenue 33, Baku (Azerbaijan); Yildiz, H. Duran [Physics Department, Faculty of Sciences and Arts, Dumlupinar University, Merkez Kampus, Ankara (Turkey)

2007-04-23T23:59:59.000Z

330

Production Of The ADD Type Kaluza-Klein Excitations At Future e+e-, ep And pp Colliders  

SciTech Connect (OSTI)

Possible production of ADD type Kaluza-Klein excitations are investigated at future high energy e+e-, ep and pp colliders. Discovery limits and signatures of such excitations are discussed at above colliders comparatively.

Billur, A. A.; Ciftci, A. K. [Physics Department, Faculty of Sciences, Ankara University, 06100 Tandogan, Ankara (Turkey); Ciftci, R. [Physics Department, Faculty of Sciences and Arts, Gazi University, 06500 Teknikokullar (Turkey); Inan, S. C. [Physics Department, Faculty of Sciences and Arts, Cumhuriyet University, 58140, Sivas (Turkey); Sultansoy, S. [Physics Department, Faculty of Sciences and Arts, Gazi University, 06500 Teknikokullar (Turkey); Institute of Physics, Academy of Sciences, H. Cavid Avenue 33, Baku (Azerbaijan)

2007-04-23T23:59:59.000Z

331

Production of the Randall-Sundrum Type Kaluza-Klein Excitations at Future e+e-, ep and pp Colliders  

SciTech Connect (OSTI)

Possible production of Randall-Sundrum type Kaluza-Klein excitations are investigated at future high energy e+e-, ep and pp colliders. Discovery limits and signatures of such excitations are discussed at above colliders comparatively.

Billur, A. A.; Ciftci, A. K. [Physics Department, Faculty of Sciences, Ankara University, 06100 Tandogan, Ankara (Turkey); Ciftci, R. [Physics Department, Faculty of Sciences and Arts, Gazi University, 06500 Teknikokullar (Turkey); Inan, S. C. [Physics Department, Faculty of Sciences and Arts, Cumhuriyet University, 58140, Sivas (Turkey); Sultansoy, S. [Physics Department, Faculty of Sciences and Arts, Gazi University, 06500 Teknikokullar (Turkey); Institute of Physics, Academy of Sciences, H. Cavid Avenue 33, Baku (Azerbaijan)

2007-04-23T23:59:59.000Z

332

Single Anomalous Production of the Fourth SM Family Leptons at Future e+e-, ep and pp Colliders  

SciTech Connect (OSTI)

Possible single productions of fourth SM family charged and neutral leptons via anomalous interactions at the future e+e-, ep, and pp colliders are studied. Signatures of such anomalous processes are argued at above colliders comparatively.

Ciftci, A. K. [Physics Department, Faculty of Sciences, Ankara University, 06100 Tandogan, Ankara (Turkey); Ciftci, R.; Karadeniz, H. [Physics Department, Faculty of Sciences and Arts, Gazi University, 06500 Teknikokullar, Ankara (Turkey); Sultansoy, S. [Physics Department, Faculty of Sciences and Arts, Gazi University, 06500 Teknikokullar, Ankara (Turkey); Institute of Physics, Academy of Sciences, H. Cavid Avenue 33, Baku (Azerbaijan); Yildiz, H. Duran [Physics Department, Faculty of Sciences and Arts, Dumlupinar University, Merkez Campus, Kutahya (Turkey)

2007-04-23T23:59:59.000Z

333

Electron Ion Collider: The Next QCD Frontier Understanding  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

Electron Electron Ion Collider: The Next QCD Frontier Understanding the glue that binds us all White Paper Writing Committee Elke C. Aschenauer Brookhaven National Laboratory William Brooks Universidad T´ ecnica Federico Santa Maria Abhay Deshpande 1 Stony Brook University Markus Diehl Deutsches Elektronen-Synchrotron DESY Haiyan Gao Duke University Roy Holt Argonne National Laboratory Tanja Horn The Catholic University of America Andrew Hutton Thomas Jefferson National Accelerator Facility Yuri Kovchegov The Ohio State University Krishna Kumar University of Massachusetts, Amherst Zein-Eddine Meziani 1 Temple University Alfred Mueller Columbia University Jianwei Qiu 1 Brookhaven National Laboratory Michael Ramsey-Musolf University of Wisconsin Thomas Roser Brookhaven National Laboratory 1 Co-Editor 1 Franck Sabati´ e Commissariat ` a l' ´ Energie Atomique-Saclay

334

Precise Predictions for Z + 4 Jets at Hadron Colliders  

SciTech Connect (OSTI)

We present the cross section for production of a Z boson in association with four jets at the Large Hadron Collider, at next-to-leading order in the QCD coupling. When the Z decays to neutrinos, this process is a key irreducible background to many searches for new physics. Its computation has been made feasible through the development of the on-shell approach to perturbative quantum field theory. We present the total cross section for pp collisions at {radical}s = 7 TeV, after folding in the decay of the Z boson, or virtual photon, to a charged-lepton pair. We also provide distributions of the transverse momenta of the four jets, and we compare cross sections and distributions to the corresponding ones for the production of a W boson with accompanying jets.

Ita, H.; Bern, Z.; Dixon, L.J.; Cordero, F.Febres; Kosower, D.A.; Maitre, D.

2011-12-09T23:59:59.000Z

335

The Problem of Colliding Networks and its Relation to Cancer  

E-Print Network [OSTI]

Complex systems, ranging from living cells to human societies, can be represented as attractor networks, whose basic property is to exist in one of allowed states, or attractors. We noted that merging two systems that are in distinct attractors creates uncertainty, as the hybrid system cannot assume two attractors at once. As a prototype of this problem, we explore cell fusion, whose ability to combine distinct cells into hybrids was proposed to cause cancer. By simulating cell types as attractors, we find that hybrids are prone to assume spurious attractors, which are emergent and sporadic states of networks, and propose that cell fusion can make a cell cancerous by placing it into normally inaccessible spurious states. We define basic features of hybrid networks and suggest that the problem of colliding networks has general significance in processes represented by attractor networks, including biological, social, and political phenomena.

Alexei A. Koulakov; Yuri Lazebnik

2012-01-13T23:59:59.000Z

336

Collective Effects in the SuperB Collider  

SciTech Connect (OSTI)

Some collective effects have been studied for the SuperB high luminosity collider. Estimates of the effect of Intra Beam Scattering (IBS) on the emittance and energy spread growths have been carried up for both the High Energy (HER, positrons) and the Low Energy (LER, electrons) rings. Electron cloud build up simulations for HER were performed with the ECLOUD code, developed at CERN, to predict the cloud formation in the arcs, taking into account possible remediation techniques such as clearing electrodes. The new code CMAD, developed at SLAC, has been used to study the effect of this electron cloud on the beam and assess the thresholds above which the electron cloud instability would set in.

Demma, Theo; /INFN, Rome; Pivi, Mauro; /SLAC

2012-06-25T23:59:59.000Z

337

Strangelet Search at the BNL Relativistic Heavy Ion Collider  

SciTech Connect (OSTI)

We have searched for strangelets in a triggered sample of 61 million central (top 4percent) Au+Au collisions at sqrt sNN = 200 GeV near beam rapidities at the STAR solenoidal tracker detector at the BNL Relativistic Heavy Ion Collider. We have sensitivity to metastable strangelets with lifetimes of order>_0.1 ns, in contrast to limits over ten times longer in BNL Alternating Gradient Synchrotron (AGS) studies and longer still at the CERN Super Proton Synchrotron (SPS). Upper limits of a few 10-6 to 10-7 per central Au+Au collision are set for strangelets with mass>~;;30 GeV/c2.

Ritter, Ha

2005-11-27T23:59:59.000Z

338

E1 Working Group Summary: Neutrino Factories and Muon Colliders  

E-Print Network [OSTI]

We are in the middle of a time of exciting discovery, namely that neutrinos have mass and oscillate. In order to take the next steps to understand this potential window onto what well might be the mechanism that links the quarks and leptons, we need both new neutrino beams and new detectors. The new beamlines can and should also provide new laboratories for doing charged lepton flavor physics, and the new detectors can and should also provide laboratories for doing other physics like proton decay, supernovae searches, etc. The new neutrino beams serve as milestones along the way to a muon collider, which can answer questions in yet another sector of particle physics, namely the Higgs sector or ultimately the energy frontier. In this report we discuss the current status of neutrino oscillation physics, what other oscillation measurements are needed to fully explore the phenomenon, and finally, what other new physics can be explored as a result of building of these facilities.

D. Harris

2001-11-02T23:59:59.000Z

339

A Staged Muon Accelerator Facility For Neutrino and Collider Physics  

E-Print Network [OSTI]

Muon-based facilities offer unique potential to provide capabilities at both the Intensity Frontier with Neutrino Factories and the Energy Frontier with Muon Colliders. They rely on a novel technology with challenging parameters, for which the feasibility is currently being evaluated by the Muon Accelerator Program (MAP). A realistic scenario for a complementary series of staged facilities with increasing complexity and significant physics potential at each stage has been developed. It takes advantage of and leverages the capabilities already planned for Fermilab, especially the strategy for long-term improvement of the accelerator complex being initiated with the Proton Improvement Plan (PIP-II) and the Long Baseline Neutrino Facility (LBNF). Each stage is designed to provide an R&D platform to validate the technologies required for subsequent stages. The rationale and sequence of the staging process and the critical issues to be addressed at each stage, are presented.

Delahaye, Jean-Pierre; Brice, Stephen; Bross, Alan David; Denisov, Dmitri; Eichten, Estia; Holmes, Stephen; Lipton, Ronald; Neuffer, David; Palmer, Mark Alan; Bogacz, S Alex; Huber, Patrick; Kaplan, Daniel M; Snopok, Pavel; Kirk, Harold G; Palmer, Robert B; Ryne, Robert D

2015-01-01T23:59:59.000Z

340

Model performance of the new Tevatron Collider lattice  

SciTech Connect (OSTI)

The 1991 Tevatron Collider lattice contains new elements such as electrostatic separators, feed-down sextupoles and new low-beta quadrupoles. The new low-beta section at B0 is a matched insertion. One can vary the {beta}* from 1.7 m to 0.25 m while keeping the lattice parameters around the ring constant. Another important characteristic of the new insertion is that it provides zero dispersion at the interaction point. An identical (matched) low- beta insertion will be installed at D0. These low-beta insertion will be installed at D0. These low-beta insertions use two new types of cold-iron, high gradient quadrupoles. In this paper we concentrate on the effects of the measured multipoles of the new low-beta quadrupoles. We have calculated the tune shift and smear caused by the multipole content of these magnets. 6 refs., 9 figs.

Saritepe, S.; Peggs, S.

1991-05-01T23:59:59.000Z

Note: This page contains sample records for the topic "level linear collider" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


341

New technologies for a future superconducting proton collider  

SciTech Connect (OSTI)

New more economic approaches are required to continue the dramatic exponential rise in particle accelerator energies as represented by the well- known Livingston plot. The old idea of low-cost, low-field iron dominated magnets in a small diameter pipe may become feasible in the next decade with dramatic recent advances in technology: (1) high T{sub c} superconductors operating at liquid N{sub 2} or H{sub 2} temperatures, (2) advanced tunneling technologies for small diameter, non human accessible tunnels, (3) accurate remote guidance systems for boring machine steering, (4) industrial applications of remote manipulation and robotics, and (5) digitally multiplexed electronics to minimize cables There is an opportunity for mutually beneficial partnerships between the High Energy Physics community and the commercial sector to develop the necessary technology. This will gain public support, a necessary part of the challenge of building a new, very high energy collider.

Malamud, E.; Foster, G.W.

1996-06-01T23:59:59.000Z

342

3-D SPH simulations of colliding winds in eta Carinae  

E-Print Network [OSTI]

We study colliding winds in the superluminous binary eta Carinae by performing three-dimensional, Smoothed Particle Hydrodynamics (SPH) simulations. For simplicity, we assume both winds to be isothermal. We also assume that wind particles coast without any net external forces. We find that the lower density, faster wind from the secondary carves out a spiral cavity in the higher density, slower wind from the primary. Because of the phase-dependent orbital motion, the cavity is very thin on the periastron side, whereas it occupies a large volume on the apastron side. The model X-ray light curve using the simulated density structure fits very well with the observed light curve for a viewing angle of i=54 degrees and phi=36 degrees, where i is the inclination angle and phi is the azimuth from apastron.

Atsuo T. Okazaki; Stanley P. Owocki; Christopher M. P. Russell; Michael F. Corcoran

2008-03-27T23:59:59.000Z

343

Theoretical X-ray Line Profiles from Colliding Wind Binaries  

E-Print Network [OSTI]

We present theoretical X-ray line profiles from a range of model colliding wind systems. In particular, we investigate the effects of varying the stellar mass-loss rates, the wind speeds, and the viewing orientation. We find that a wide range of theoretical line profile shapes is possible, varying with orbital inclination and phase. At or near conjunction, the lines have approximately Gaussian profiles, with small widths (HWHM ~ 0.1 v_infty) and definite blue- or redshifts (depending on whether the star with the weaker wind is in front or behind). When the system is viewed at quadrature, the lines are generally much broader (HWHM ~ v_infty), flat-topped and unshifted. Local absorption can have a major effect on the observed profiles - in systems with mass-loss rates of a few times 10^{-6} Msol/yr the lower energy lines (E wind of the primary. The orbital variation ...

Henley, D B; Pittard, J M

2003-01-01T23:59:59.000Z

344

RECENT PROGRESS TOWARD A MUON RECIRCULATING LINEAR ACCELERATOR  

SciTech Connect (OSTI)

Both Neutrino Factories (NF) and Muon Colliders (MC) require very rapid acceleration due to the short lifetime of muons. After a capture and bunching section, a linac raises the energy to about 900 MeV, and is followed by one or more Recirculating Linear Accelerators (RLA), possibly followed by a Rapid Cycling Synchnotron (RCS) or Fixed-Field Alternating Gradient (FFAG) ring. A RLA reuses the expensive RF linac section for a number of passes at the price of having to deal with different energies within the same linac. Various techniques including pulsed focusing quadruopoles, beta frequency beating, and multipass arcs have been investigated via simulations to improve the performance and reduce the cost of such RLAs.

Slawomir Bogacz, Vasiliy Morozov, Yves Roblin, Kevin Beard

2012-07-01T23:59:59.000Z

345

LINEAR COUPLING CORRECTION WITH N-TURN MAPS.  

SciTech Connect (OSTI)

The linear one-turn map of a storage ring contains coupling information on which a correction algorithm can be based. In principal, the one-turn matrix can be fitted from turn-by-turn data of beam position monitors after a kick was applied. However, the so obtained coupling information often sinks into the noise floor. The signal-to-noise ratio of the coupling information can be greatly enhanced by fitting maps for larger turn numbers N, equal to half the beat period. With the so obtained N-turn map an automated global coupling correction is possible without the need for a tune change. This is demonstrated for the Relativistic Heavy Ion Collider where the algorithm is implemented for operational use at injection.

FISCHER,W.

2003-05-12T23:59:59.000Z

346

Probing strongly-interacting electroweak dynamics through W{sup +}W{sup {minus}}/ZZ ratios at future e{sup +}e{sup {minus}} colliders  

SciTech Connect (OSTI)

The authors point out that the ratio of W{sup +}W{sup {minus}} {yields} W{sup +}W{sup {minus}} and W{sup +}W{sup {minus}} {yields} ZZ cross sections is a sensitive probe of the dynamics of electroweak symmetry breaking, in the CM energy region {radical}s{sub ww} {approx_gt} 1 TeV where vector boson scattering may well become strong. They suggest ways in which this ratio can be extracted at a 1.5 TeV e{sup +}e{sup {minus}} linear collider, using W{sup {+-}}, Z {yields} jj hadronic decays and relying on dijet mass resolution to provide statistical discrimination between W{sup {+-}} and Z. WW fusion processes studied here are unique for exploring scalar resonances of mass about 1 TeV and are complementary to studies via the direct channel e{sup +}e{sup {minus}} {yields} W{sup +}W{sup {minus}} for the vector and non-resonant cases. With an integrated luminosity of 200 fb{sup {minus}1}, the signals obtained are statistically significant. Comparison with a study of e{sup {minus}}e{sup {minus}} {yields} {nu}{nu}W{sup {minus}}W{sup {minus}} process is made. Enhancements of the signal rate from using a polarized electron beam, or at a 2 TeV e{sup +}e{sup {minus}} linear collider and possible higher energy {mu}{sup +}{mu}{sup {minus}} colliders, are also presented.

Barger, V. [Univ. of Wisconsin, Madison, WI (United States). Physics Dept.; Cheung, K. [Univ. of Texas, Austin, TX (United States). Center for Particle Physics; Han, T. [Univ. of California, Davis, CA (United States). Physics Dept.; Phillips, R.J.N. [Rutherford Appleton Lab., Chilton (United Kingdom)

1995-01-01T23:59:59.000Z

347

Linear concentrating solar collector  

SciTech Connect (OSTI)

The present invention relates to a segment of a linear concentrating solar collector which includes two plates distanced from each other and extending parallel to each other; a member connects the plates to each other and holes are bored in each of the plates in a parallel manner along a parabolic curve. A member passes through the holes each holding a small strip made of a reflecting material all strips together forming a parabolic surface. The invention relates also to a collector comprising at least two of each segments and an absorber extending along the focus line of the entire collector. The collector is advantageously provided with horizontal and/or vertical members which ascertains that the collector can follow the position of the sun.

Aharon, N. B.

1985-08-06T23:59:59.000Z

348

Linear and Non Linear Analysis of the Hadley Circulation  

Science Journals Connector (OSTI)

We present a synthesis of results obtained with the linear stability of the one-cell Hadley circulation. This flow is observe in the...

P. Laure; B. Roux

1990-01-01T23:59:59.000Z

349

Berkeley Proton Linear Accelerator  

DOE R&D Accomplishments [OSTI]

A linear accelerator, which increases the energy of protons from a 4 Mev Van de Graaff injector, to a final energy of 31.5 Mev, has been constructed. The accelerator consists of a cavity 40 feet long and 39 inches in diameter, excited at resonance in a longitudinal electric mode with a radio-frequency power of about 2.2 x 10{sup 6} watts peak at 202.5 mc. Acceleration is made possible by the introduction of 46 axial "drift tubes" into the cavity, which is designed such that the particles traverse the distance between the centers of successive tubes in one cycle of the r.f. power. The protons are longitudinally stable as in the synchrotron, and are stabilized transversely by the action of converging fields produced by focusing grids. The electrical cavity is constructed like an inverted airplane fuselage and is supported in a vacuum tank. Power is supplied by 9 high powered oscillators fed from a pulse generator of the artificial transmission line type.

Alvarez, L. W.; Bradner, H.; Franck, J.; Gordon, H.; Gow, J. D.; Marshall, L. C.; Oppenheimer, F. F.; Panofsky, W. K. H.; Richman, C.; Woodyard, J. R.

1953-10-13T23:59:59.000Z

350

Third harmonic cavity design and RF measurements for the Frascati DA?NE collider  

Science Journals Connector (OSTI)

Third harmonic passive RF cavities have been proposed for installation in both rings of the DA?NE factory collider to improve the Touschek lifetime and to increase the Landau damping. This paper illustrates the design of the harmonic cavities. The main requirements were to obtain a relatively low R/Q factor and a quality factor Q as high as possible to satisfy beam dynamics requirements and to damp all the higher order mode (HOM) to a harmless level in order to avoid multibunch instabilities. A spherical shape of the cavity central body has been chosen as an optimum compromise between a high Q resonator and a low R/Q factor. HOM suppression has been provided by a ferrite ring damper designed for the superconducting cavities of the high energy ring of the KEK-B factory. The design and electromagnetic properties of the resonant modes have been studied with MAFIA and HFSS codes. Cavities have been made of aluminum and the RF measurements have been performed to characterize them. The measurements are in a good agreement with numerical simulations results, demonstrating a satisfactory HOM damping.

David Alesini; Roberto Boni; Alessandro Gallo; Fabio Marcellini; Mikhail Zobov; Mauro Migliorati; Luigi Palumbo

2004-09-07T23:59:59.000Z

351

Reliability of Beam Loss Monitors System for the Large Hadron Collider  

Science Journals Connector (OSTI)

The employment of superconducting magnets in high energy colliders opens challenging failure scenarios and brings new criticalities for the whole system protection. For the LHC beam loss protection system the failure rate and the availability requirements have been evaluated using the Safety Integrity Level (SIL) approach. A downtime cost evaluation is used as input for the SIL approach. The most critical systems which contribute to the final SIL value are the dump system the interlock system the beam loss monitors system and the energy monitor system. The Beam Loss Monitors System (BLMS) is critical for short and intense particle losses while at medium and higher loss time it is assisted by other systems such as the quench protection system and the cryogenic system. For BLMS hardware and software have been evaluated in detail. The reliability input figures have been collected using historical data from the SPS using temperature and radiation damage experimental data as well as using standard databases. All the data have been processed by reliability software (Isograph). The analysis ranges from the components data to the system configuration.

G. Guaglio; B. Dehning; C. Santoni

2004-01-01T23:59:59.000Z

352

Effects of invisible particle emission on global inclusive variables at hadron colliders  

E-Print Network [OSTI]

We examine the effects of invisible particle emission in conjunction with QCD initial state radiation (ISR) on quantities designed to probe the mass scale of new physics at hadron colliders, which involve longitudinal as well as transverse final-state momenta. This is an extension of our previous treatment, arXiv:0903.2013, of the effects of ISR on global inclusive variables. We present resummed results on the visible invariant mass distribution and compare them to parton-level Monte Carlo results for top quark and gluino pair-production at the LHC. There is good agreement as long as the visible pseudorapidity interval is large enough (eta ~ 3). The effect of invisible particle emission is small in the case of top pair production but substantial for gluino pair production. This is due mainly to the larger mass of the intermediate particles in gluino decay (squarks rather than W-bosons). We also show Monte Carlo modelling of the effects of hadronization and the underlying event. The effect of the underlying event is large but may be approximately universal.

Andreas Papaefstathiou; Bryan Webber

2010-04-27T23:59:59.000Z

353

Unit I-3 Linear Independence & Bases 1 Linear independence & bases  

E-Print Network [OSTI]

} ­ so we can write u1 = c2u2 + c3u3 + ... + crur with not all ci = 0 ­ re-arranging gives a non-zero lc u1 - c2u2 - c3u3 - ... - crur = 0 so the vectors are linearly dependent ! Unit I-3 Linear

Birkett, Stephen

354

Large hadron collider (LHC) project quality assurance plan  

SciTech Connect (OSTI)

The LHC Quality Assurance Plan is a set of operating principles, requirements, and practices used to support Berkeley Lab's participation in the Large Hadron Collider Project. The LHC/QAP is intended to achieve reliable, safe, and quality performance in the LHC project activities. The LHC/QAP is also designed to fulfill the following objectives: (1) The LHC/QAP is Berkeley Lab's QA program document that describes the elements necessary to integrate quality assurance, safety management, and conduct of operations into the Berkeley Lab's portion of the LHC operations. (2) The LHC/QAP provides the framework for Berkeley Lab LHC Project administrators, managers, supervisors, and staff to plan, manage, perform, and assess their Laboratory work. (3) The LHC/QAP is the compliance document that conforms to the requirements of the Laboratory's Work Smart Standards for quality assurance (DOE O 414.1, 10 CFR 830.120), facility operations (DOE O 5480.19), and safety management (DOE P 450.4).

Gullo, Lisa; Karpenko, Victor; Robinson, Kem; Turner, William; Wong, Otis

2002-09-30T23:59:59.000Z

355

A LATTICE FOR THE 50 GEV MUON COLLIDER RING.  

SciTech Connect (OSTI)

A resent progress report on the lattice design of the 50-50 GeV muon collider is presented. The ring circumference needs to be as small as possible due to the short lifetime of the 50 GeV muons. The background at the detector is affected by the continuous decay of muons into electrons which requires a dipole between the high focusing quadrupoles and the detector. To obtain a luminosity on the order of 1 x 10{sup 33} cm{sup {minus}2} S{sup {minus}1} it is required to have beam intensities on the order of 1 x 10{sup 12} particles per bunch. The rms momentum spread of the beam is equal to 0.12% and the beta functions at the interaction point are equal to 4 cm. The maxima of the betatron functions at these quadrupoles are 1300 m, resulting in large chromaticities which must be corrected by local chromatic correction. Pairs of horizontal and vertical chromatic sextupoles are located at locations where the corresponding betatron functions are 100 m and the values of the horizontal dispersion functions are 3 and 2 m, respectively. They are carefully placed so that most of their nonlinear effects are canceled. The dynamic aperture is larger than 7 times the mean size of the beam for the momentum offsets larger than {minus}6 and +10 sigmas.

TRBOJEVIC,D.

1998-06-28T23:59:59.000Z

356

Theoretical X-ray Line Profiles from Colliding Wind Binaries  

E-Print Network [OSTI]

We present theoretical X-ray line profiles from a range of model colliding wind systems. In particular, we investigate the effects of varying the stellar mass-loss rates, the wind speeds, and the viewing orientation. We find that a wide range of theoretical line profile shapes is possible, varying with orbital inclination and phase. At or near conjunction, the lines have approximately Gaussian profiles, with small widths (HWHM ~ 0.1 v_\\infty) and definite blue- or redshifts (depending on whether the star with the weaker wind is in front or behind). When the system is viewed at quadrature, the lines are generally much broader (HWHM ~ v_\\infty), flat-topped and unshifted. Local absorption can have a major effect on the observed profiles - in systems with mass-loss rates of a few times 10^{-6} Msol/yr the lower energy lines (E wind of the primary. The orbital variation of the line widths and shifts is reduced in a low inclination binary. The extreme case is a binary with i = 0 degrees, for which we would expect no line profile variation.

D. B. Henley; I. R. Stevens; J. M. Pittard

2003-06-23T23:59:59.000Z

357

From a {nu} factory to {mu} super + mu super {minus} Colliders  

SciTech Connect (OSTI)

An important feature of a {mu}-storage ring {nu}-source is that it can be extended to the possibility of a future high-energy muon collider. The neutrino source provides a useful physics device that initiates key technologies required for future {mu}{sup +}-{mu}{sup {minus}} Colliders, but with much less demanding parameter requirements. These technologies include high-intensity {mu}-production, {mu}-capture, {mu}-cooling, {mu}-acceleration and multiturn {mu} storage rings. {mu}{sup +}-{mu}{sup {minus}} colliders require a similar number of muons, but they require that the muons be cooled to a much smaller phase space and formed into a small number of bunches, and both positive and negative bunches must be simultaneously captured. These differences are discussed, and the extension of the {nu}-source to {mu}{sup +}-{mu}{sup {minus}} collider specifications is described.

David Neuffer

2000-12-21T23:59:59.000Z

358

Comparison of discovery limits for extra Z bosons at future colliders  

Science Journals Connector (OSTI)

We study and compare the discovery potential for heavy neutral gauge bosons (Z) at various e+e- and pp(-) colliders that are planned or have been proposed. Typical discovery limits are for the Fermilab Tevatron ?1 TeV, Di-Tevatron ?2 TeV, CERN LHC ?4 TeV, LSGNA (a 60 TeV pp collider) ?13 TeV while the e+e- discovery limits are 210 ?s with the large variation reflecting the model dependence of the limits. While both types of colliders have comparable discovery limits the hadron colliders are generally less dependent on the specific Z model and provide more robust limits since the signal has little background. In contrast, discovery limits for e+e- limits are more model dependent and, because they are based on indirect inferences of deviations from standard model predictions, they are more sensitive to systematic errors.

Stephen Godfrey

1995-02-01T23:59:59.000Z

359

Detector possibilities for a {mu}{sup +} {mu}{sup {minus}} collider  

SciTech Connect (OSTI)

This report discusses the problem of large background in detectors used in a muon-antimuon collider and proposes its solution through specific modifications to the CDF design. 4 refs., 2 figs.

Atac, M. [Fermi National Accelerator Lab., Batavia, IL (United States)]|[California Univ., Los Angeles, CA (United States)

1996-05-01T23:59:59.000Z

360

Neutrino experiments and the Large Hadron Collider: friends across 14 orders of magnitude  

E-Print Network [OSTI]

This paper explores some of the questions that connect the Large Hadron Collider (LHC) and neutrino experiments. What is the origin of mass? What is the meaning of flavor? Is there direct evidence of new forces or particles? ...

Conrad, Janet

Note: This page contains sample records for the topic "level linear collider" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


361

THEORETICAL PROGRESS FOR THE ASSOCIATED PRODUCTION OF A HIGGS BOSON WITH HEAVY QUARKS AT HADRON COLLIDERS.  

SciTech Connect (OSTI)

The production of a Higgs boson in association with a pair of t{bar t} or b{bar b} quarks plays a very important role at both the Tevatron and the Large Hadron Collider. The theoretical prediction of the corresponding cross sections has been improved by including the complete next-to-leading order QCD corrections. After a brief introduction, we review the results obtained for both the Tevatron and the Large Hadron Collider.

DAWSON,S.JACKSON,C.B.ORR,L.H.REINA,L.WACKEROTH,D.

2003-07-17T23:59:59.000Z

362

Linear plasma-based tritium production facility  

SciTech Connect (OSTI)

The concept presented here is an adaptation of a recently completed conceptual design of a compact high-fluence D-T neutron source for accelerated end-of-life testing of fusion reactor materials. Although this preliminary assessment serves to illustrate the main features of a linear plasma-based tritium breeder, it is not necessarily an optimized design. We believe that proper design choices for the breeder application will certainly reduce costs, perhaps as much as a factor of two. We also point out that Q (the ratio of fusion power produced to power input to the plasma) increases with system length and that the cost per kg of tritium decreases for longer systems with higher output. In earlier studies of linear two-component plasma systems, Q values as high as three were predicted. At this level of performance and with energy recovery, operating power requirements of the breeder could approach zero. 5 refs., 1 fig., 1 tab.

Coensgen, F.H.; Futch, A.H.; Molvik, A.W.

1989-02-15T23:59:59.000Z

363

MHK Technologies/The Linear Generator | Open Energy Information  

Open Energy Info (EERE)

Linear Generator Linear Generator < MHK Technologies Jump to: navigation, search << Return to the MHK database homepage The Linear Generator.jpg Technology Profile Primary Organization Trident Energy Ltd Project(s) where this technology is utilized *MHK Projects/TE4 Technology Resource Click here Wave Technology Type Click here Point Absorber Technology Readiness Level Click here TRL 1-3: Discovery / Concept Definition / Early Stage Development & Design & Engineering Technology Description The simplicity of the Trident Energy solution is based around the fact that the system has only one moving part - float / linear generator translator, which is powered by the motion of floats placed in the sea. As waves pass through the wavefarm, so the floats rise and fall. This causes relative motion between the two components of the linear generator (the translator and stator) and electricity is immediately generated. There is absolutely no contact between the two parts of the generator as the energy conversion is entirely electromagnetic.

364

Linear actuator powered flapping wing  

E-Print Network [OSTI]

Small scale unmanned aerial vehicles (UAVs) have proven themselves to be useful, but often too noisy for certain operations due to their rotary motors. This project examined the feasibility of using an almost silent linear ...

Benson, Christopher Lee

2010-01-01T23:59:59.000Z

365

linear-elements-code.scm  

E-Print Network [OSTI]

(o Linear-finite-element-operator)) ;; initialize various fields that depend on the space ;; if coefficients is not defined, we set it to arrays of floating-point ;; zeros...

366

Highly linear low noise amplifier  

E-Print Network [OSTI]

, the Low Noise Amplifier (LNA) is expected to provide high linearity, thus preventing the intermodulation tones created by the interference signal from corrupting the carrier signal. The research focuses on designing a novel LNA which achieves high...

Ganesan, Sivakumar

2007-09-17T23:59:59.000Z

367

Linear Accelerator | Advanced Photon Source  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

(MeV). At 450 MeV, the electrons are relativistic: they are traveling at >99.999% of the speed of light, which is 299,792,458 meters second (186,000 milessecond). Photo: Linear...

368

Preservation and control of the proton and deuteron polarizations in the proposed electron-ion collider at Jefferson Lab  

SciTech Connect (OSTI)

We propose a scheme of preserving the proton and deuteron beam polarizations during acceleration and storage in the proposed electron-ion collider at Jefferson Lab. This scheme allows one to provide both the longitudinal and transverse polarization orientations of the proton and deuteron beams at the interaction points of the figure-8 ion collider ring. We discuss questions of matching the polarization direction at all stages of the beam transport including the pre-booster, large booster and ion collider ring.

Kondratenko, Anatoliy [Scientific and Technical Laboratory Zaryad, Novosibirsk (Russian Federation); Derbenev, Yaroslav S. [JLAB, Newport News, VA (United States); Filatov, Yury [Moscow Institute of Physics and Technology, Dolgoprudny (Russian Federation); Lin, Fanglei [JLAB, Newport News, VA (United States); Morozov, Vasiliy [JLAB, Newport News, VA (United States); Kondratenko, M. A. [Scientific and Technical Laboratory Zaryad, Novosibirsk (Russian Federation); Zhang, Yuhong [JLAB, Newport News, VA (United States)

2014-01-01T23:59:59.000Z

369

R&D Towards a Muon Collider H. Guler (undergraduate student), C. Lu, K.T. McDonald,  

E-Print Network [OSTI]

R&D Towards a Muon Collider H. Guler (undergraduate student), C. Lu, K.T. McDonald, E.J. Prebys, S.E. Vahsen (graduate student) Princeton U. May 26, 1998 Muon Collider main page: http://www.cap.bnl.gov/mumu/mu home page.html Princeton muon collider page: http://www.hep.princeton.edu/~mcdonald/mumu 1 #12;Options

McDonald, Kirk

370

R&D Towards a Muon Collider H. Guler (undergraduate student), C. Lu, K.T. McDonald,  

E-Print Network [OSTI]

R&D Towards a Muon Collider H. Guler (undergraduate student), C. Lu, K.T. McDonald, E.J. Prebys, S.E. Vahsen (graduate student) Princeton U. May 26, 1998 Muon Collider main page: http://www.cap.bnl.gov/mumu/mu home page.html Princeton muon collider page: http://www.hep.princeton.edu/?mcdonald/mumu 1 #12; Options

McDonald, Kirk

371

SunShot Initiative: Linear Fresnel  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

Linear Fresnel to someone by Linear Fresnel to someone by E-mail Share SunShot Initiative: Linear Fresnel on Facebook Tweet about SunShot Initiative: Linear Fresnel on Twitter Bookmark SunShot Initiative: Linear Fresnel on Google Bookmark SunShot Initiative: Linear Fresnel on Delicious Rank SunShot Initiative: Linear Fresnel on Digg Find More places to share SunShot Initiative: Linear Fresnel on AddThis.com... Concentrating Solar Power Systems Parabolic Trough Linear Fresnel Power Tower Dish Engine Components Competitive Awards Staff Photovoltaics Systems Integration Balance of Systems Linear Fresnel DOE funds solar research and development (R&D) in linear Fresnel systems as one of four CSP technologies aiming to meet the goals of the SunShot Initiative. Linear Fresnel systems, which are a type of linear

372

Effect of 3D Polarization profiles on polarization measurements and colliding beam experiments  

SciTech Connect (OSTI)

The development of polarization profiles are the primary reason for the loss of average polarization. Polarization profiles have been parametrized with a Gaussian distribution. We derive the effect of 3-dimensional polarization profiles on the measured polarization in polarimeters, as well as the observed polarization and the figure of merit in single and double spin experiments. Examples from RHIC are provided. The Relativistic Heavy Ion Collider (RHIC) is the only collider of spin polarized protons. During beam acceleration and storage profiles of the polarization P develop, which affect the polarization measured in a polarimeter, and the polarization and figure of merit (FOM) in colliding beam experiments. We calculate these for profiles in all dimensions, and give examples for RHIC. Like in RHIC we call the two colliding beams Blue and Yellow. We use the overbar to designate intensity-weighted averages in polarimeters (e.g. {bar P}), and angle brackets to designate luminosity-weighted averages in colliding beam experiments (e.g.

).

Fischer, W.; Bazilevsky, A.

2011-08-18T23:59:59.000Z

373

Disbursement of $65 million to the State of Texas for construction of a Regional Medical Technology Center at the former Superconducting Super Collider Site, Waxahachie, Texas  

SciTech Connect (OSTI)

As part of a settlement agreement between the US DOE and the State of Texas, DOE proposes to transfer $65 million of federal funds to the Texas National Research Laboratory Commission (TNLRC) for construction of the Regional Medical Technology Center (RMTC) to be located in Ellis County, Texas. The RMTC would be a state-of-the-art medical facility for proton cancer therapy, operated by the State of Texas in conjunction with the University of Texas Southwestern Medical Center. The RMTC would use the linear accelerator assets of the recently terminated DOE Superconducting Super Collider Project to accelerate protons to high energies for the treatment of cancer patients. The current design provides for treatment areas, examination rooms, support laboratories, diagnostic imaging equipment, and office space as well as the accelerators (linac and synchrotron) and beam steering and shaping components. The potential environmental consequences of the proposed action are expected to be minor.

NONE

1995-05-01T23:59:59.000Z

374

Recombinant Science: The Birth of the Relativistic Heavy Ion Collider (431st Brookhaven Lecture)  

SciTech Connect (OSTI)

As part of the celebration of Brookhaven Lab's 60th anniversary, Robert P. Crease, the Chair of the Philosophy Department at Stony Brook University and BNL's historian, will present the second of two talks on the Lab's history. In "Recombinant Science: The Birth of the Relativistic Heavy Ion Collider," Dr. Crease will focus on the creation of the world's most powerful colliding accelerator for nuclear physics. Known as RHIC, the collider, as Dr. Crease will recount, was formally proposed in 1984, received initial construction funding from the U.S. Department of Energy in 1991, and started operating in 2000. In 2005, the discovery at RHIC of the world's most perfect liquid, a state of matter that last existed just moments after the Big Bang, was announced, and, since then, this perfect liquid of quarks and gluons has been the subject of intense study.

Crease, Robert P. (Ph.D, Department of Philosophy, Stony Brook University) [Ph.D, Department of Philosophy, Stony Brook University

2007-12-12T23:59:59.000Z

375

MHK Technologies/Ocean Current Linear Turbine | Open Energy Information  

Open Energy Info (EERE)

Linear Turbine Linear Turbine < MHK Technologies Jump to: navigation, search << Return to the MHK database homepage Ocean Current Linear Turbine.jpg Technology Profile Primary Organization Ocean Energy Company LLC Technology Type Click here Seabed mooring system Technology Readiness Level Click here TRL 5 6 System Integration and Technology Laboratory Demonstration Technology Description Endless cable loop with parachutes spliced to cable which moored in an ocean current pulls the cable through rotors which in turn power conventional electricity generators See US Patent 3 887 817 Additional patent pending Technology Dimensions Device Testing Date Submitted 30:08.6 << Return to the MHK database homepage Retrieved from "http://en.openei.org/w/index.php?title=MHK_Technologies/Ocean_Current_Linear_Turbine&oldid=681618"

376

Independent Oversight Inspection, Stanford Linear Accelerator...  

Broader source: Energy.gov (indexed) [DOE]

Stanford Linear Accelerator Center - January 2007 January 2007 Inspection of Environment, Safety, and Health Programs at the Stanford Linear Accelerator Center This report...

377

Les Houches guidebook to Monte Carlo generators for hadron collider physics  

SciTech Connect (OSTI)

Recently the collider physics community has seen significant advances in the formalisms and implementations of event generators. This review is a primer of the methods commonly used for the simulation of high energy physics events at particle colliders. We provide brief descriptions, references, and links to the specific computer codes which implement the methods. The aim is to provide an overview of the available tools, allowing the reader to ascertain which tool is best for a particular application, but also making clear the limitations of each tool.

Dobbs, Matt A.; Frixione, Stefano; Laenen, Eric; Tollefson, Kirsten

2004-03-01T23:59:59.000Z

378

Les Houches Guidebook to Monte Carlo generators for hadron collider physics  

SciTech Connect (OSTI)

Recently the collider physics community has seen significant advances in the formalisms and implementations of event generators. This review is a primer of the methods commonly used for the simulation of high energy physics events at particle colliders. We provide brief descriptions, references, and links to the specific computer codes which implement the methods. The aim is to provide an overview of the available tools, allowing the reader to ascertain which tool is best for a particular application, but also making clear the limitations of each tool.

Dobbs, M.A

2004-08-24T23:59:59.000Z

379

GPU-optimized Code for Long-term Simulations of Beam-beam Effects in Colliders  

SciTech Connect (OSTI)

We report on the development of the new code for long-term simulation of beam-beam effects in particle colliders. The underlying physical model relies on a matrix-based arbitrary-order symplectic particle tracking for beam transport and the Bassetti-Erskine approximation for beam-beam interaction. The computations are accelerated through a parallel implementation on a hybrid GPU/CPU platform. With the new code, a previously computationally prohibitive long-term simulations become tractable. We use the new code to model the proposed medium-energy electron-ion collider (MEIC) at Jefferson Lab.

Roblin, Yves [JLAB; Morozov, Vasiliy [JLAB; Terzic, Balsa [JLAB; Aturban, Mohamed A. [Old Dominion University; Ranjan, D. [Old Dominion University; Zubair, Mohammed [Old Dominion University

2013-06-01T23:59:59.000Z

380

Interaction region design for a RHIC-based medium-energy electron-ion collider  

SciTech Connect (OSTI)

As a first step in a staged approach towards a RHIC-based electron-ion collider, installation of a 4 GeV energy-recovery linac (ERL) in one of the RHIC interaction regions is currently under investigation. To minimize costs, the interaction region of this collider has to use the present RHIC magnets for focusing of the high-energy ion beam. Meanwhile, electron low-beta focusing needs to be added in the limited space available between the existing separator dipoles. We discuss the challenges and present the current design status of this e-A interaction region.

Montag,C.; Beebe-Wang, J.

2009-05-04T23:59:59.000Z

Note: This page contains sample records for the topic "level linear collider" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


381

Collider Detector at Fermilab (CDF): Data from Supersymmetry, New Phenomena Research of the CDF Exotics Group  

DOE Data Explorer [Office of Scientific and Technical Information (OSTI)]

The Collider Detector at Fermilab (CDF) is a Tevatron experiment at Fermilab. The Tevatron, a powerful particle accelerator, accelerates protons and antiprotons close to the speed of light, and then makes them collide head-on inside the CDF detector. The CDF detector is used to study the products of such collisions. The CDF Physics Group at Fermilab is organized into six working groups, each with a specific focus. The Exotics group searches for Supersymmetry and other New Phenomena. Their public web page makes data and numerous figures available from both CDF Runs I and II.

382

Collider Detector at Fermilab (CDF): Data from the Top Group's Top Quark Research  

DOE Data Explorer [Office of Scientific and Technical Information (OSTI)]

The Collider Detector at Fermilab (CDF) is a Tevatron experiment at Fermilab. The Tevatron, a powerful particle accelerator, accelerates protons and antiprotons close to the speed of light, and then makes them collide head-on inside the CDF detector. The CDF detector is used to study the products of such collisions. The CDF Physics Group at Fermilab is organized into six working groups, each with a specific focus. The Top group studies the properties of the top quark, the heaviest known fundamental particle. Their public web page makes data and numerous figures available from both CDF Runs I and II.

383

Linear operator inequalities for strongly stable weakly regular linear systems  

E-Print Network [OSTI]

that A has compact resolvent and its eigenvectors form a Riesz basis for the state space, we give an explicit to a spectral factorization problem and to a lin- ear quadratic optimal control problem. More concretely R, which implies that R #21; 0. The associated linear matrix inequality in the unknown self

Curtain, Ruth F.

384

Resurgence, Stokes phenomenon and alien derivatives for levelone linear  

E-Print Network [OSTI]

Resurgence, Stokes phenomenon and alien derivatives for level­one linear di#erential systems. Mich of alien derivatives. We make explicit the Stokes­Ramis matrices as functions of the connection constants, summability, resurgence, alien derivatives. AMS classification: 34M03, 34M30, 34M35, 34M40. 1 #12; Loday

385

Search for Supersymmetry Using Weak Boson Fusion Processes in Proton-Proton Collisions at the Large Hadron Collider  

E-Print Network [OSTI]

In 2012, the Large Hadron Collider at CERN (LHC) collided protons at an unprecedented center-of-mass energy of 8 TeV. With data corresponding to a total integrated luminosity of 19.7 fb^(?1), the Compact Muon Solenoid (CMS) collaboration is studying...

Flanagan, Will

2014-08-08T23:59:59.000Z

386

Transformations for densities Linear transformations  

E-Print Network [OSTI]

' & $ % Lecture 28 Transformations for densities Linear transformations 1-1 differentiable functions General transformations Expectation of a function 1 #12;' & $ % Transformations for discrete transformation of a U[0, 1] · Take X U[0, 1], so that fX(x) = 1 0 0 and set Y

Adler, Robert J.

387

A 3 TeV on 3 TeV proton-proton dedicated collider for Fermilab  

SciTech Connect (OSTI)

The Fermilab Dedicated Collider proposed in May 1983 is a 2 TeV on 2 TeV p)bar p) collider. The expected luminosity is )approximately) 10/sup 31/ cm/sup (minus/2)sec/sup )minus/1) and the estimated cost is )approximately) $362M (FY-83 dollars). Since 1983 both the superconducting magnet and the particle detector technologies have advanced and the countenance of physics, hence the desired characteristics of new facilities have also altered somewhat. We want to show here that with the new magnet technology used for the SSC one can construct a 3 TeV on 3 TeV pp collider on the Fermilab site. This pp Dedicated Collider )PPDC) will have a luminosity of about 10/sub 33/cm/sup )minus/2)sec)sup)minus)1) and a cost only )approximately) 50)percent) more than that of the p)bar p) Dedicated Collider. 3 figs

Teng, L.C.

1988-03-30T23:59:59.000Z

388

Linear Optics From Closed Orbits (LOCO): An Introduction  

SciTech Connect (OSTI)

The LOCO code is used to find and correct errors in the linear optics of storage rings. The original FORTRAN code was written to correct the optics of the NSLS X-Ray ring, and was applied soon thereafter to debug problems with the ALS optics. The ideas used in the code were developed from previous work at SLAC. Several years ago, LOCO was rewritten in MATLAB. As described in this newsletter, the MATLAB version includes a user-friendly interface, with many useful fitting and analysis options. LOCO has been used at many accelerators. Presently, a search for LOCO in the text of papers on the Joint Accelerator Conferences Website yields 107 papers. A comprehensive survey of applications will not be included here. Details of recent results at a few light sources are included in this newsletter. In the past, the quality of LOCO fitting results varied significantly, depending on the storage ring. In particular, the results were mixed for colliding beam facilities, where there tend to be fewer BPMs that in light sources. Fitting rings with less BPM data to constrain the fit optics parameters often led to unreasonably large fit quadrupole gradient variations. Recently, modifications have been made to the LOCO fitting algorithm which leads to much better results when the BPM data does not tightly constrain the fit parameters. The modifications are described in this newsletter, and an example of results with this new algorithm is included.

Safranek, James; /SLAC

2009-06-18T23:59:59.000Z

389

Physics requirements for the design of the ATLAS and CMS experiments at the Large Hadron Collider  

Science Journals Connector (OSTI)

...at the high-energy frontier: the...Hadron Collider are discovery experiments...responsible for dark matter; what...itself at the 1TeV energy scale. Supersymmetry...candidate for dark matter. An as...also allow the discovery of whatever Nature...store at the LHC energies. There could...

2012-01-01T23:59:59.000Z

390

DESIGN OF THE MERCURY HANDLING SYSTEM FOR A MUON COLLIDER/NEUTRINO FACTORY TARGET  

E-Print Network [OSTI]

DESIGN OF THE MERCURY HANDLING SYSTEM FOR A MUON COLLIDER/NEUTRINO FACTORY TARGET V.B. Graves , Oak is a free mercury jet within a 20-T magnetic field being impacted by an 8-GeV proton beam. A pool of mercury serves as a receiving reservoir for the mercury and a dump for the unexpended proton beam. Modifications

McDonald, Kirk

391

On CP violation and the measurement of the dimuon charge asymmetry at hadron colliders  

E-Print Network [OSTI]

B factories measure the CP violation parameter of B^0 Bbar^0 mixing and decay. Hadron colliders measure the dimuon charge asymmetry of an admixture of B hadrons. In this note we discuss a subtle point on how the CP violation parameter of B^0_s Bbar^0_s mixing and decay can be extracted from these measurements.

B. Hoeneisen

2006-07-26T23:59:59.000Z

392

Overview of results from the Fermilab fixed target and collider experiments  

SciTech Connect (OSTI)

In this paper we present a review of recent QCD related results from Fermilab fixed target and collider experiments. Topics covered range from structure functions through W/Z production, heavy quark production and jet angular distributions. We also include the current state of knowledge about leptoquark pair production in hadronic collisions.

Montgomery, H.E.

1997-06-01T23:59:59.000Z

393

CP Violation in Meson Decays Workshop on Heavy Quark Physics at the Upgraded Hera Collider  

E-Print Network [OSTI]

CP Violation in Meson Decays Workshop on Heavy Quark Physics at the Upgraded Hera Collider 21/10/2003 Yossi Nir (Weizmann Institute of Science) CP Violation 1/28 #12;Motivation Why do theorists like CP violation? 1. At last, the study of CPV is experiment-driven. 2. CP is a symmetry of the strong interactions

394

arXiv:acc-phys/9602001v112Feb1996 MUON COLLIDERS  

E-Print Network [OSTI]

, A. Garren3,7 , M. Green3 , S. Kahn1 , H. Kirk1 , Y. Y. Lee1 , F. Mills5 , N. Mokhov5 , G. Morgan1 on upgrades of the FERMILAB machines would also be possible (see second Ref. [4]). Hadron collider energies are limited by their size and technical constraints on bending magnetic fields. At very high energies it would

Wurtele, Jonathan

395

A NEW GENERATION OF EBIS: HIGH CURRENT DEVICES FOR ACCELERATORS AND COLLIDERS*  

E-Print Network [OSTI]

A NEW GENERATION OF EBIS: HIGH CURRENT DEVICES FOR ACCELERATORS AND COLLIDERS* E. Beebe, J. Alessi of magnitude compared to fixed target operation of existing accelerators.[1] RHIC, for example, requires 3.4x10 20 times higher than electron beams utilized in devices at accelerators at Dubna, Saclay

396

The Neutrino Factory and Muon Collider Collaboration From a Neutrino Factory to Carlsbad  

E-Print Network [OSTI]

The Neutrino Factory and Muon Collider Collaboration From a Neutrino Factory to Carlsbad BNL FNAL KEK CERN Carlsbad Kirk T. McDonald Princeton U. mcdonald@puphep.princeton.edu Workshop on the Next Generation U.S. Underground Science Facility Carlsbad, NM, June 13, 2000 http://puhep1.princeton

McDonald, Kirk

397

Emission characteristics and dynamics of the stagnation layer in colliding laser produced plasmas  

E-Print Network [OSTI]

Emission characteristics and dynamics of the stagnation layer in colliding laser produced plasmas P been investigated using time and space resolved optical emission spectroscopies and spectrally and angularly resolved fast imaging. The emission results highlight a difference in neutral atom and ion

Harilal, S. S.

398

s-Channel Higgs Boson Production at a Muon-Muon Collider  

Science Journals Connector (OSTI)

High luminosity muon-muon colliders would provide a powerful new probe of Higgs boson physics through s-channel resonance production. We discuss the prospects for detection of Higgs bosons and precision measurements of their masses and widths at such a machine.

V. Barger; M. S. Berger; J. F. Gunion; T. Han

1995-08-21T23:59:59.000Z

399

3D modelling of the colliding winds in Carinae evidence for radiative inhibition  

Science Journals Connector (OSTI)

......Section 5.2). An alternative explanation is that efficient...particle acceleration in Car has recently been presented...the colliding winds in Car with spatially extended, energy dependent, X-ray emission...orientation and nature of Car through comparison with......

E. R. Parkin; J. M. Pittard; M. F. Corcoran; K. Hamaguchi; I. R. Stevens

2009-04-21T23:59:59.000Z

400

Physics Opportunities at a Muon Collider Kirk T. McDonald  

E-Print Network [OSTI]

@puphep.princeton.edu January 7, 1999 DPF'99 Session 11B: Future Accelerator Projects Muon Collider main page: http at any energy. · Intense neutrino beams and spallation neutron beams are available as byproducts. Muons. ­ A rich supersymmetric sector. ­ ... And more .... · That our investment in future accelerators

McDonald, Kirk

Note: This page contains sample records for the topic "level linear collider" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


401

T864 (MiniMax): A Search for Disoriented Chiral Condensate at the Fermilab Collider  

E-Print Network [OSTI]

A small test/experiment has been performed at the Fermilab Collider to measure charged particle and photon multiplicities in the forward direction, $\\eta \\approx 4.1$. The primary goal is to search for disoriented chiral condensate (DCC). The experiment and analysis methods are described, and preliminary results of the DCC search are presented.

J. D. Bjorken

1996-10-16T23:59:59.000Z

402

Review of beam energy measurements at VEPP4M collider KEDR/VEPP4M $  

E-Print Network [OSTI]

Review of beam energy measurements at VEPP­4M collider KEDR/VEPP­4M $ V.E. Blinov, A.V. Bogomyagkov measurement Energy calibration Depolarization technique Compton scattering a b s t r a c t An accurate approaches are used for the beam energy measurements. The resonant spin depolarization technique (RD

403

Multiple Equilibria and Hysteresis of Two Unequal-Transport Western Boundary Currents Colliding at a Gap  

Science Journals Connector (OSTI)

The nonlinear collision of two western boundary currents (WBCs) of Munk thickness LM colliding near a gap of width 2a is studied using a 1.5-layer, reduced-gravity, quasigeostrophic ocean model. The work is a continuation of our recent study on ...

Zheng Wang; Dongliang Yuan

2014-07-01T23:59:59.000Z

404

Study of nuclear dynamics of neutron-rich colliding pair at energy of vanishing flow  

E-Print Network [OSTI]

We study nuclear dynamics at the energy of vanishing flow of neutron-rich systems having N/Z ratio 1.0, 1.6 and 2.0 throughout the mass range at semi central colliding geometry. In particular we study the behavior of average and maximum density with N/Z dependence of the system.

Sakshi Gautam

2011-07-28T23:59:59.000Z

405

LEIC - A Polarized Low Energy Electron-ion Collider at Jefferson Lab  

SciTech Connect (OSTI)

A polarized electron-ion collider is envisioned as the future nuclear science program at JLab beyond the 12 GeV CEBAF. Presently, a medium energy collider (MEIC) is set as an immediate goal with options for a future energy upgrade. A comprehensive design report for MEIC has been released recently. The MEIC facility could also accommodate electron and proton/ion collisions in a low CM energy range, covering proton energies from 10 to 25 GeV and ion energies with a similar magnetic rigidity, for additional science reach. In this paper, we present a conceptual design of this low energy collider, LEIC, showing its luminosity can reach above 10{sup 33} cm{sup -2}s{sup -1}. The design specifies that the large booster of the MEIC is converted to a low energy ion collider ring with an interaction region and an electron cooler integrated into it. The design provides options for either sharing the detector with the MEIC or a dedicated low energy detector in a third collision point, with advantages of either a minimum cost or extra detection parallel to the MEIC operation, respectively. The LEIC could be positioned as the first and low cost phase of a multi-stage approach to realize the full MEIC.

Derbenev, Yaroslav S. [Thomas Jefferson National Accelerator Facility, Newport News, VA (United States); Hutton, Andrew M. [Thomas Jefferson National Accelerator Facility, Newport News, VA (United States); Krafft, Geoffrey A. [Thomas Jefferson National Accelerator Facility, Newport News, VA (United States); Li, Rui [Thomas Jefferson National Accelerator Facility, Newport News, VA (United States); Lin, Fanglei [Thomas Jefferson National Accelerator Facility, Newport News, VA (United States); Morozov, Vasiliy [Thomas Jefferson National Accelerator Facility, Newport News, VA (United States); Nissen, Edward W. [Thomas Jefferson National Accelerator Facility, Newport News, VA (United States); Yunn, Byung C. [Thomas Jefferson National Accelerator Facility, Newport News, VA (United States); Zhang, He [Thomas Jefferson National Accelerator Facility, Newport News, VA (United States); Sullivan, Michael K. [SLAC National Accelerator Laboratory, Menlo Park, CA (United States); Zhang, Yuhong [Thomas Jefferson National Accelerator Facility, Newport News, VA (United States)

2013-06-01T23:59:59.000Z

406

Physics and Analysis at a Hadron Collider - Searching for New Physics (2/3)  

ScienceCinema (OSTI)

This is the second lecture of three which together discuss the physics of hadron colliders with an emphasis on experimental techniques used for data analysis. This second lecture discusses techniques important for analyses searching for new physics using the CDF B_s --> mu+ mu- search as a specific example. The lectures are aimed at graduate students.

None

2011-10-06T23:59:59.000Z

407

Formation of carbon allotrope aerosol by colliding plasmas in an inertial fusion reactor  

Science Journals Connector (OSTI)

Along with repeated implosions, the interior of an inertial fusion target chamber is exposed to short pulses of high-energy x-ray, unburned DT-fuel particles, He-ash and pellet debris. As a result, chamber wall materials are subjected to ablation, emitting particles in the plasma state. Ablated particles will either be re-deposited elsewhere or collide with each other, perhaps in the centre-of-symmetry region of the chamber volume. Colliding ablation plasma particles can lead to the formation of clusters to grow into aerosol, possibly floating thereafter, which can deteriorate the subsequent implosion performance via laser scattering, etc. In a laboratory-scale YAG laser setup, the formation of nano-scale aerosol has been demonstrated in vacuum at irradiation power densities of the orders of 10810Wcm?2 at 10Hz, each 6ns long, simulating the high-repetition rate inertial fusion reactor situation. Interestingly, carbon aerosol formation has been observed in the form of fullerene onion, nano- and micro-tubes when laser-ablated plasma plumes of carbon collide with each other. In contrast, colliding plasma plumes of metals tend to generate aerosol in the form of droplets under identical laser irradiation conditions. An atomic and molecular reaction model is proposed to interpret the process of carbon allotrope aerosol formation.

Y. Hirooka; H. Sato; K. Ishihara; T. Yabuuchi; K.A. Tanaka

2014-01-01T23:59:59.000Z

408

Data acquisition and online processing requirements for experimentation at the Superconducting Super Collider  

SciTech Connect (OSTI)

Differences in scale between data acquisition and online processing requirements for detectors at the Superconducting Super Collider and systems for existing large detectors will require new architectures and technological advances in these systems. Emerging technologies will be employed for data transfer, processing, and recording. 9 refs., 3 figs.

Lankford, A.J.; Barsotti, E.; Gaines, I.

1989-07-01T23:59:59.000Z

409

Workshop on Calorimetery for the Superconducting Super Collider  

SciTech Connect (OSTI)

The international workshop brought together 170 participants to further develop the SSC design and performance specifications of the LAr, Gas, Scintillation, Silicon, and Warm Liquid calorimeter technologies, and to develop the general topics of Requirements, Simulation, and Electronics. Progress was made across a broad front in all areas; at the feasibility level for some and In the fine structure for others. The meeting established areas of agreement, provided some general direction, and helped to quantify some differences at widely varying levels of detector technology development. The workshop helped to level the different understandings of the participants; increased the depth of the generalists and the breadth of the specialists. A high degree of group partitioning limited access to the detailed discussion within some detector groups. The communication was clearly necessary and rewarding, and seemed to meet or exceed the expectations of most participants. This report will deal with: the Liquid Argon detector and, to a lesser extent, the Requirements working groups, an update on uranIum material logistics, and a view of LAr calorimetry by others.

Mulholland, G.T.; /Fermilab

1989-03-19T23:59:59.000Z

410

Radiation and Background Levels in a CLIC Detector due to Beam-Beam Effects Optimisation of Detector Geometries and Technologies  

E-Print Network [OSTI]

The high charge density---due to small beam sizes---and the high energy of the proposed CLIC concept for a linear electron--positron collider with a centre-of-mass energy of up to 3~TeV lead to the production of a large number of particles through beam-beam interactions at the interaction point during every bunch crossing (BX). A large fraction of these particles safely leaves the detector. A still significant amount of energy will be deposited in the forward region nonetheless, which will produce secondary particles able to cause background in the detector. Furthermore, some particles will be created with large polar angles and directly cause background in the tracking detectors and calorimeters. The main sources of background in the detector, either directly or indirectly, are the incoherent $mathrm{e}^{+}mathrm{e}^{-}$ pairs and the particles from $gammagamma ightarrow$ hadron events. The background and radiation levels in the detector have to be estimated, to study if a detector is feasible, that can han...

Sailer, Andr; Lohse, Thomas

2013-01-10T23:59:59.000Z

411

Cast dielectric composite linear accelerator  

DOE Patents [OSTI]

A linear accelerator having cast dielectric composite layers integrally formed with conductor electrodes in a solventless fabrication process, with the cast dielectric composite preferably having a nanoparticle filler in an organic polymer such as a thermosetting resin. By incorporating this cast dielectric composite the dielectric constant of critical insulating layers of the transmission lines of the accelerator are increased while simultaneously maintaining high dielectric strengths for the accelerator.

Sanders, David M. (Livermore, CA); Sampayan, Stephen (Manteca, CA); Slenes, Kirk (Albuquerque, NM); Stoller, H. M. (Albuquerque, NM)

2009-11-10T23:59:59.000Z

412

Segmented rail linear induction motor  

DOE Patents [OSTI]

A segmented rail linear induction motor has a segmented rail consisting of a plurality of nonferrous electrically conductive segments aligned along a guideway. The motor further includes a carriage including at least one pair of opposed coils fastened to the carriage for moving the carriage. A power source applies an electric current to the coils to induce currents in the conductive surfaces to repel the coils from adjacent edges of the conductive surfaces.

Cowan, Jr., Maynard (1107 Stagecoach Rd. SE., Albuquerque, NM 87123); Marder, Barry M. (1412 Pinnacle View Dr. NE., Albuquerque, NM 87123)

1996-01-01T23:59:59.000Z

413

Segmented rail linear induction motor  

DOE Patents [OSTI]

A segmented rail linear induction motor has a segmented rail consisting of a plurality of nonferrous electrically conductive segments aligned along a guideway. The motor further includes a carriage including at least one pair of opposed coils fastened to the carriage for moving the carriage. A power source applies an electric current to the coils to induce currents in the conductive surfaces to repel the coils from adjacent edges of the conductive surfaces. 6 figs.

Cowan, M. Jr.; Marder, B.M.

1996-09-03T23:59:59.000Z

414

WHAT DO THREAT LEVELS AND RESPONSE LEVELS MEAN? THREAT LEVELS  

E-Print Network [OSTI]

WHAT DO THREAT LEVELS AND RESPONSE LEVELS MEAN? THREAT LEVELS: The UK Threat Level is decided by the Government's Joint Terrorism Analysis Centre (JTAC). It is the system to assess the threat to the UK from Threat Levels: Low - an attack is unlikely Moderate - an attack is possible, but not likely Substantial

Edinburgh, University of

415

B_c Meson Production Around the Z^0 Peak at a High Luminosity e^+ e^- Collider  

SciTech Connect (OSTI)

Considering the possibility to build an e{sup +}e{sup -} collider at the energies around the Z{sup 0}-boson resonance with a planned luminosity so high as L {proportional_to} 10{sup 34} {approx} 10{sup 36} cm{sup -2}s{sup -1} (super Z-factory), we make a detailed discussion on the (c{bar b})-quarkonium production through e{sup +}e{sup -} {yields} (c{bar b})[n] + b + {bar c} within the framework of non-relativistic QCD. Here [n] stands for the Fock-states |(c{sub b}){sub 1}[{sup 1}S{sub 0}]>, |(c{bar b})8[{sup 1}S{sub 0}]g>, |(c{bar b} ){sub 1}[{sup 3}S{sub 1}]>, |(c{bar b}){sub 8}[{sup 3}S{sub 1}]g>, |(c{bar b}){sub 1}[{sup 1}P{sub 1}]> and |(c{bar b}){sub 1}[{sup 3}P{sub J}]> (with J = (1, 2, 3)) respectively. To simplify the hard-scattering amplitude as much as possible and to derive analytic expressions for the purpose of future events simulation, we adopt the 'improved trace technology' to do our calculation, which deals with the hard scattering amplitude directly at the amplitude level other than the conventional way at the squared-amplitude level. Total cross-section uncertainties caused by the quark masses are predicted by taking m{sub c} = 1.50 {+-} 0.30 GeV and m{sub b} = 4.90 {+-} 0.40 GeV. If all higher (c{bar b})-quarkonium states decay to the ground state B{sub c} (|(c{bar b}){sub 1}[{sup 1}S{sub 0}]>) with 100% efficiency, we obtain {sigma}{sub e{sup +}+e{sup -}{yields}B{sub c}+b+{bar c}} = 5.190{sub -2.419}{sup +6.222} pb, which shows that about 10{sup 5} {approx} 10{sup 7} B{sub c} events per operation year can be accumulated in the super Z-factory. If taking the collider energy runs slightly off the Z{sup 0}-peak, i.e. {radical}S = (1.00 {+-} 0.05)m{sub Z}, the total cross-section shall be lowered by about one-order from its peak value. Such a super Z-factory shall provide another useful platform to study the properties of B{sub c} meson, or even the properties of its excited P-wave states, in addition to its production at the hadronic colliders Tevatron and LHC.

Yang, Zhi; /Chongqing U.; Wu, Xing-Gang; /Chongqing U. /SLAC; Chen, Gu; Liao, Qi-Li; /Chongqing U.; Zhang, Jia-Wei; /Chongqing U.

2012-05-22T23:59:59.000Z

416

Dereverberation by linear systems techniques  

E-Print Network [OSTI]

- sentation by a finite number of thin layers and wave propagation normal to these layers. A linear, recursive mathematical model is developed and a method for the identification of parameters in the absence of noise i. , discussed. Appli ations are made...--Final System Configuration 29 16. Water Model--System Flow Diagram 17. The A Matrix 18. The B, C, and D Matrices 31 32 33 I. INTROD&JCTIO22 The removal of deleterious effects which arise in the transmission of waves through layered media is a problem...

Schell, John August

1970-01-01T23:59:59.000Z

417

R&D ERL: Low level RF  

SciTech Connect (OSTI)

A superconducting RF (SRF) Energy Recovery Linac (ERL) is currently under development at the Collider-Accelerator Department (C-AD) at Brookhaven National Laboratory (BNL). The major components from an RF perspective are (a) a 5-cell SRF ERL cavity, (b) an SRF photocathode electron gun, and (c) a drive laser for the photocathode gun. Each of these RF subsystems has its own set of RF performance requirements, as well as common requirements for ensuring correct synchronism between them. A low level RF (LLRF) control system is currently under development, which seeks to leverage both technology and experience gained from the recently commissioned RHIC LLRF system upgrade. This note will review the LLRF system requirements and describe the system to be installed at the ERL.

Smith, K.

2010-01-15T23:59:59.000Z

418

Unit I-4 More about linear maps 1 More about linear maps  

E-Print Network [OSTI]

Unit I-4 More about linear maps 1 Unit I-4 More about linear maps Unit I-4 More about linear maps 2 Using bases to define linear maps · V, U vector spaces · a unique linear map T: V U is determined · if v = a1v1 + ... + anvn then T(v) = a1T(v1) + ... + anT(vn) Unit I-4 More about linear maps 3 Example

Birkett, Stephen

419

Cryogenic technology boosts linear accelerator capability  

Science Journals Connector (OSTI)

Cryogenic technology boosts linear accelerator capability ... Two critical properties of matter at cryogenic temperaturessuperconductivity and superfluidityshould open the way for a major advance in electron linear accelerator capability. ...

1968-05-06T23:59:59.000Z

420

Ultrashort Pulse Propagation in the Linear Regime  

E-Print Network [OSTI]

First, we investigate the Bouguer-Lambert-Beer (BLB) law as applied to the transmission of ultrashort pulses through water in the linear absorption regime. We present a linear theory for propagation of ultrashort laser pulses, and related...

Wang, Jieyu

2010-07-14T23:59:59.000Z

Note: This page contains sample records for the topic "level linear collider" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


421

New architecture for RF power amplifier linearization  

E-Print Network [OSTI]

Power amplifier linearization has become an important part of the transmitter system as 3G and developing 4G communication standards require higher linearity than ever before. The thesis proposes two power amplifier ...

Boo, Hyun H

2009-01-01T23:59:59.000Z

422

COLLIDER-ACCELERATOR DEPARTMENT T. Roser, Chair W. Fischer, Associate Chair for Accelerators  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

COLLIDER-ACCELERATOR DEPARTMENT COLLIDER-ACCELERATOR DEPARTMENT T. Roser, Chair W. Fischer, Associate Chair for Accelerators P. Pile, Associate Chair for Experimental Support & Facilities I. Ben-Zvi, Associate Chair for Accelerator R&D E. Lessard, Associate Chair for ESSHQ D.I. Lowenstein, Associate Chair for Accelerator Applications & Education S. LaMontagne, Associate Chair for Administration J. Sandberg, Chief E.E. J. Tuozzolo, Chief M.E. L. DiFilippo*, Assistant C. Meyer, Assistant S. Kuczewski*, (ISD), Librarian A L D - B. Mueller D. Dowling (HR), NPP HRM iRCMS CRADA S. Peggs, Head (M. Sivertz), Project Manager (D. Trbojevic), Chief Scientist (C. Scholl), Assistant (S. LaMontagne) (D.I. Lowenstein) (M. Mapes) (I. Marneris) (M. Minty) (K. Mirabella) (M. Okamura) (A. Pendzlck) (P. Pile)

423

Galactic scale gas flows in colliding galaxies: 3-Dimensional, N-body/hydrodynamics experiments  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

Galactic Scale Gas Flows in Colliding Galaxies: Galactic Scale Gas Flows in Colliding Galaxies: a-Dimensional, N-bodyjHydrodynamics Experiments Susan A. Lamb* NORDITA and Neils Bohr Institute, Blegdamsvej 17, DK-2100, Kpbenhaven 0, Danmark. Richard A. Gerber University of Illinois at Urbana-Champaign, Departments of Physics and Astronomy, 1110 W. Green Street, Urbana, IL 61801, U.S.A. and Dinshaw S. Balsara t Johns Hopkins University, Department of Physics and Astronomy, Homewood Campu.s, Baltimore, MD 21218, U.S.A. Abstract. We present some result.s from three dimensional computer simulations of collisions between models of equal mass gaJaxies, one of which is a rotating, disk galaxy containing both gas and stars and the other is an elliptical contaiuing stars only. We use fully self consistent models in which the

424

The Science Case for An Electron-Ion Collider: The Next QCD Frontier  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

Case for Case for An Electron-Ion Collider: The Next QCD Frontier Jianwei Qiu Brookhaven National Laboratory NSAC Subcommittee Meeting on Scientific Facilities February 15-16, 2013 for both BNL and JLab EIC efforts, ... 1 White Paper for the Electron-Ion Collider ELIC (JLab) eRHIC (BNL) 2 arXiv:1212.1701 Community effort and commitment Ten-week program (9/13-11/19, 2010) at Institute for Nuclear Theory (INT Report: arXiv:1108.1713v2, 500+ pages)  Many workshops on EIC physics: 3  Commitment from BNL and JLab:  EICAC - jointly by BNL and JLab  BNL EIC Task force (https://wiki.bnl.gov/eic/index.php/Main_Page)  EIC@JLab (https://eic.jlab.org/wiki/index.php/Main_Page)  Detector R&D (https://wiki.bnl.gov/conferences/index.php/EIC_R%25D)

425

Betatron squeeze optimisation at the Large Hadron Collider based on first year of operation data  

E-Print Network [OSTI]

In order to achieve the high luminosity expected from the Large Hadron Collider, the beta function at the interaction points must be minimised. As the aperture in the surroundings of the interaction points become smaller and smaller with decreasing beta function at the interaction point, the latter is kept higher during injection and energy ramp and reduced before the production of collision, by the means of the betatron squeeze. This operation as shown to be very critical in previous colliders, however, good performances were achieved early during the commissioning of the machine allowing to optimise this operation along the year. Firstly, a systematic fill by fill analysis of the beam parameters is performed in order to point out, understand and solve potential issues, allowing, in particular, to minimise the beam losses during the operation. Secondly, simulations of beam parameters based on the strength of the magnets extracted from the control system are introduced and validated with measurements. The sim...

Buffat, Xavier; Redaelli, Stefano

2011-01-01T23:59:59.000Z

426

Effect of Beam-Beam Interactions on Stability of Coherent Oscillations in a Muon Collider  

SciTech Connect (OSTI)

In order to achieve peak luminosity of a muon collider in the 10{sup 34}/cm{sup 2}/s range the number of muons per bunch should be of the order of a few units of 10{sup 12} rendering the beam-beam parameter as high as 0.1 per IP. Such strong beam-beam interaction can be a source of instability if the working point is chosen close to a coherent beam-beam resonance. On the other hand, the beam-beam tunespread can provide a mechanism of suppression of the beam-wall driven instabilities. In this report the coherent instabilities driven by beam-beam and beam-wall interactions are studied with the help of BBSS code for the case of 1.5 TeV c.o.m muon collider.

Alexahin, Y.; /Fermilab; Ohmi, K.; /KEK, Tsukuba

2012-05-01T23:59:59.000Z

427

The Interplay Between Collider Searches For Supersymmetric Higgs Bosons and Direct Dark Matter Experiments  

SciTech Connect (OSTI)

In this article, we explore the interplay between searches for supersymmetric particles and Higgs bosons at hadron colliders (the Tevatron and the LHC) and direct dark matter searches (such as CDMS, ZEPLIN, XENON, EDELWEISS, CRESST, WARP and others). We focus on collider searches for heavy MSSM Higgs bosons (A, H, H{sup {+-}}) and how the prospects for these searches are impacted by direct dark matter limits and vice versa. We find that the prospects of these two experimental programs are highly interrelated. A positive detection of A, H or H{sup {+-}} at the Tevatron would dramatically enhance the prospects for a near future direct discovery of neutralino dark matter. Similarly, a positive direct detection of neutralino dark matter would enhance the prospects of discovering heavy MSSM Higgs bosons at the Tevatron or the LHC. Combining the information obtained from both types of experimental searches will enable us to learn more about the nature of supersymmetry.

Carena, Marcela; Hooper, Dan; /Fermilab; Vallinotto, Alberto; /Fermilab /Chicago U. /Paris, Inst. Astrophys.

2006-11-01T23:59:59.000Z

428

The colliding-wind binary WR140: the particle acceleration laboratory  

E-Print Network [OSTI]

WR+O star binary systems exhibit synchrotron emission arising from relativistic electrons accelerated where the wind of the WR star and that of its massive binary companion collide - the wind-collision region (WCR). These ``colliding-wind'' binaries (CWB), provide an excellent laboratory for the study of particle acceleration, with the same physical processes as observed in SNRs, but at much higher mass, photon and magnetic energy densities. WR140 is the best studied CWB, and high resolution radio observations permit a determination of several system parameters, particularly orbit inclination and distance, that are essential constraints for newly developed models of CWBs. We show a model fit to the radio data at orbital phase 0.9, and show how these models may be used to predict the high energy emission from WR140.

S. M. Dougherty; J. M. Pittard

2005-10-18T23:59:59.000Z

429

Test of relativistic gravity for propulsion at the Large Hadron Collider  

E-Print Network [OSTI]

A design is presented of a laboratory experiment that could test the suitability of relativistic gravity for propulsion of spacecraft to relativistic speeds. An exact time-dependent solution of Einstein's gravitational field equation confirms that even the weak field of a mass moving at relativistic speeds could serve as a driver to accelerate a much lighter payload from rest to a good fraction of the speed of light. The time-dependent field of ultrarelativistic particles in a collider ring is calculated. An experiment is proposed as the first test of the predictions of general relativity in the ultrarelativistic limit by measuring the repulsive gravitational field of bunches of protons in the Large Hadron Collider (LHC). The estimated 'antigravity beam' signal strength at a resonant detector of each proton bunch is 3 nm/s^2 for 2 ns during each revolution of the LHC. This experiment can be performed off-line, without interfering with the normal operations of the LHC.

Franklin Felber

2009-10-06T23:59:59.000Z

430

Repair of overheating linear accelerator  

SciTech Connect (OSTI)

Los Alamos Neutron Science Center (LANSCE) is a proton accelerator that produces high energy particle beams for experiments. These beams include neutrons and protons for diverse uses including radiography, isotope production, small feature study, lattice vibrations and material science. The Drift Tube Linear Accelerator (DTL) is the first portion of a half mile long linear section of accelerator that raises the beam energy from 750 keV to 100 MeV. In its 31st year of operation (2003), the DTL experienced serious issues. The first problem was the inability to maintain resonant frequency at full power. The second problem was increased occurrences of over-temperature failure of cooling hoses. These shortcomings led to an investigation during the 2003 yearly preventative maintenance shutdown that showed evidence of excessive heating: discolored interior tank walls and coper oxide deposition in the cooling circuits. Since overheating was suspected to be caused by compromised heat transfer, improving that was the focus of the repair effort. Investigations revealed copper oxide flow inhibition and iron oxide scale build up. Acid cleaning was implemented with careful attention to protection of the base metal, selection of components to clean and minimization of exposure times. The effort has been very successful in bringing the accelerator through a complete eight month run cycle allowing an incredible array of scientific experiments to be completed this year (2003-2004). This paper will describe the systems, investigation analysis, repair, return to production and conclusion.

Barkley, Walter; Baldwin, William; Bennett, Gloria; Bitteker, Leo; Borden, Michael; Casados, Jeff; Fitzgerald, Daniel; Gorman, Fred; Johnson, Kenneth; Kurennoy, Sergey; Martinez, Alberto; OHara, James; Perez, Edward; Roller, Brandon; Rybarcyk, Lawrence; Stark, Peter; Stockton, Jerry

2004-01-01T23:59:59.000Z

431

Study of single top production at high energy electron positron colliders  

E-Print Network [OSTI]

Top production will play a important role in future high energy electron--positron colliders. Detailed calculations are already available for the process $e^+e^-\\rightarrow t\\bar{t}$, but single top events have mostly been neglected so far. We evaluate the relevance of these events and advocate the exploration of the related process $e^+e^-\\rightarrow W^+bW^-\\bar{b}$.

Ignacio Garcia; Martin Perello; Eduardo Ros; Marcel Vos

2014-12-02T23:59:59.000Z

432

6D mu (+/-) cooling using a solenoid-dipole ring cooler for a muon collider  

SciTech Connect (OSTI)

Six dimensional cooling of large emittance {mu}{sup +} and {mu}{sup -} beams is required in order to obtain the desired luminosity for a muon collider. We propose to use a ring cooler that employs both dipoles and solenoids with the additional requirement that the arcs of the ring be achromatic. We describe the lattice and the beam dynamics of the proposed ring, and demonstrate that the lattice gives substantial cooling in all 6 phase space dimensions.

Garren, A.; Berg, J.; Cline, D.; Ding, X.; Kirk, H.G.

2011-08-01T23:59:59.000Z

433

Les Houches 2013: Physics at TeV Colliders: New Physics Working Group Report  

E-Print Network [OSTI]

We present the activities of the "New Physics" working group for the "Physics at TeV Colliders" workshop (Les Houches, France, 3--21 June, 2013). Our report includes new computational tool developments, studies of the implications of the Higgs boson discovery on new physics, important signatures for searches for natural new physics at the LHC, new studies of flavour aspects of new physics, and assessments of the interplay between direct dark matter searches and the LHC.

Brooijmans, G; Fuks, B; Moortgat, F; Richardson, P; Sekmen, S; Weiler, A; Alloul, A; Arbey, A; Baglio, J; Barducci, D; Barr, A J; Basso, L; Battaglia, M; Blanger, G; Belyaev, A; Bernon, J; Bharucha, A; Bondu, O; Boudjema, F; Boos, E; Buchkremer, M; Bunichev, V; Cacciapaglia, G; Chalons, G; Conte, E; Dolan, M J; Deandrea, A; De Causmaecker, K; Djouadi, A; Dumont, B; Ellis, J; Englert, C; Falkowski, A; Fichet, S; Flacke, T; Gaz, A; Ghezzi, M; Godbole, R; Goudelis, A; Gouzevitch, M; Greco, D; Grober, R; Grojean, C; Guadagnoli, D; Gunion, J F; Herrmann, B; Kalinowski, J; Kim, J H; Kraml, S; Krauss, M E; Kulkarni, S; Lee, S J; Lim, S H; Liu, D; Mahmoudi, F; Maravin, Y; Massironi, A; Mitzka, L; Mohan, K; Moreau, G; Mhlleitner, M M; Nhung, D T; O'Leary, B; Oliveira, A; Panizzi, L; Pappadopulo, D; Pataraia, S; Porod, W; Pukhov, A; Riva, F; Rojo, J; Rosenfeld, R; Ruiz-lvarez, J; Rzehak, H; Sanz, V; Sengupta, D; Spannowsky, M; Spira, M; Streicher, J; Strobbe, N; Thamm, A; Thomas, M; Torre, R; Waltenberger, W; Walz, K; Wilcock, A; Wulzer, A; Wrthwein, F; Wymant, C

2014-01-01T23:59:59.000Z

434

Construction of block-coil high-field model dipoles for future hadron colliders  

SciTech Connect (OSTI)

A family of high-field dipoles is being developed at Texas A&M University, as part of the program to improve the cost-effectiveness of superconducting magnet technology for future hadron colliders. The TAMU technology employs stress management, flux-plate control of persistent-current multipoles, conductor optimization using mixed-strand cable, and metal-filled bladders to provide pre-load and surface compliance. Construction details and status of the latest model dipole will be presented.

Blackburn, Raymond; Elliott, Tim; Henchel, William; McInturff, Al; McIntyre, Peter; Sattarov, Akhdior

2002-08-04T23:59:59.000Z

435

Physics and Analysis at a Hadron Collider - Making Measurements (3/3)  

ScienceCinema (OSTI)

This is the third lecture of three which together discuss the physics of hadron colliders with an emphasis on experimental techniques used for data analysis. This third lecture discusses techniques important for analyses making a measurement (e.g. determining a cross section or a particle property such as its mass or lifetime) using some CDF top-quark analyses as specific examples. The lectures are aimed at graduate students.

None

2011-10-06T23:59:59.000Z

436

Searching Higgs in Noncommutative Electroweak Model at Photon-Photon Collider  

E-Print Network [OSTI]

We discuss the process of Higgs boson production in $\\gamma\\gamma$ collider on noncommutative spacetime and compare the results with large extra dimension in KK graviton channel. Summing all KK mode on IR brane, the affections are in the same order by comparing noncommutatve model prediction. This process is completely forbidden in standard model on unitarity condition and bosonic distribution. In noncommutative theory, the effect is induced by the coordinates noncommutable relation, $[x^{\\mu}, x^{\

Chien Yu Chen

2008-08-31T23:59:59.000Z

437

General linear methods for Volterra integral equations  

Science Journals Connector (OSTI)

We investigate the class of general linear methods of order p and stage order q=p for the numerical solution of Volterra integral equations of the second kind. Construction of highly stable methods based on the Schur criterion is described and examples ... Keywords: Convolution test equation, General linear methods, Linear stability analysis, Order conditions, Volterra integral equations

G. Izzo; Z. Jackiewicz; E. Messina; A. Vecchio

2010-09-01T23:59:59.000Z

438

Proceedings of the workshop on triggering, data acquisition and computing for high energy, high luminosity, hadron-hadron colliders  

SciTech Connect (OSTI)

These proceedings address issues in triggering, data acquisition, and off-line computing for high energy/high luminosity hadron-hadron colliders, including physics signatures; analog triggers; data filtering/acquisition and processing; networking; and special spectrometers and instrumentation.

Cox, B.; Fenner, R.; Hale, P.

1985-01-01T23:59:59.000Z

439

Prospects for Electroweakino Discovery at a 100 TeV Hadron Collider  

E-Print Network [OSTI]

We investigate the prospects of discovering split Supersymmetry at a future 100 TeV proton-proton collider through the direct production of electroweakino next-to-lightest-supersymmetric-particles (NLSPs). We focus on signatures with multi-lepton and missing energy: $3\\ell$, opposite-sign dileptons and same-sign dileptons. We perform a comprehensive study of different electroweakino spectra. A 100 TeV collider with 3000/fb data is expected to exclude Higgsino thermal dark matter candidates with $m_{\\rm{LSP}}\\sim 1 $ TeV if Wino NLSPs are lighter than about 3.2 TeV. The $3\\ell$ search usually offers the highest mass reach, which varies in the range of (2-4) TeV depending on scenarios. In particular, scenarios with light Higgsinos have generically simplified parameter dependences. We also demonstrate that, at a 100 TeV collider, lepton collimation becomes a crucial issue for NLSPs heavier than about 2.5 TeV. We finally compare our results with the discovery prospects of gluino pair productions and deduce which ...

Gori, Stefania; Wang, Lian-Tao; Wells, James D

2014-01-01T23:59:59.000Z

440

Exotic collider signals from the complete phase diagram of minimal universal extra dimensions  

Science Journals Connector (OSTI)

Minimal universal extra dimensions (mUED) is often thought to predict that the lightest Kaluza-Klein particle (LKP) is the Kaluza-Klein gauge boson B1, leading to conventional missing energy signals at colliders and weakly interacting massive particle (WIMP) dark matter. In fact, the implications of mUED are far richer: the B1, charged Higgs boson H1, and graviton G1 are all possible LKPs, leading to many different phases with distinct signatures. Considering the complete phase diagram, we find predictions for charged or neutral particles with decay lengths of microns to tens of meters; WIMP, superWIMP, or charged relic particles; metastable particles with lifetimes of the order of or in excess of the age of the Universe; and scenarios combining two or more of these phenomena. In the cosmologically preferred region, the Higgs boson mass is between 180 and 245GeV, the LKP mass is between 810 and 1400GeV, and the maximal splitting between first Kaluza-Klein modes is less than 320GeV. This region predicts a variety of exotic collider signals, such as slow charged particles, displaced vertices, tracks with nonvanishing impact parameters, track kinks, and even vanishing charged tracks, all of which provide early discovery possibilities at the Large Hadron Collider.

Jose A. R. Cembranos; Jonathan L. Feng; Louis E. Strigari

2007-02-08T23:59:59.000Z

Note: This page contains sample records for the topic "level linear collider" from the National Library of EnergyBeta (NLEBeta).
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441

Prospects for Electroweakino Discovery at a 100 TeV Hadron Collider  

E-Print Network [OSTI]

We investigate the prospects of discovering split Supersymmetry at a future 100 TeV proton-proton collider through the direct production of electroweakino next-to-lightest-supersymmetric-particles (NLSPs). We focus on signatures with multi-lepton and missing energy: $3\\ell$, opposite-sign dileptons and same-sign dileptons. We perform a comprehensive study of different electroweakino spectra. A 100 TeV collider with 3000/fb data is expected to exclude Higgsino thermal dark matter candidates with $m_{\\rm{LSP}}\\sim 1 $ TeV if Wino NLSPs are lighter than about 3.2 TeV. The $3\\ell$ search usually offers the highest mass reach, which varies in the range of (2-4) TeV depending on scenarios. In particular, scenarios with light Higgsinos have generically simplified parameter dependences. We also demonstrate that, at a 100 TeV collider, lepton collimation becomes a crucial issue for NLSPs heavier than about 2.5 TeV. We finally compare our results with the discovery prospects of gluino pair productions and deduce which SUSY breaking model can be discovered first by electroweakino searches.

Stefania Gori; Sunghoon Jung; Lian-Tao Wang; James D. Wells

2014-10-23T23:59:59.000Z

442

Calibrating the energy of a 50 X 50 GeV muon collider using spin precession  

E-Print Network [OSTI]

The neutral Higgs boson is expected to have a mass in the region 90-150 GeV in various schemes within the Minimal Supersymmetric extension to the Standard Model. A first generation Muon Collider is uniquely suited to investigate the mass, width and decay modes of the Higgs boson, since the coupling of the Higgs to muons is expected to be strong enough for it to be produced in the s channel mode in the muon collider. Due to the narrow width of the Higgs, it is necessary to measure and control the energy of the individual muon bunches to a precision of a few parts in a million. We investigate the feasibility of determining the energy scale of a muon collider ring with circulating muon beams of 50 GeV energy by measuring the turn by turn variation of the energy deposited by electrons produced by the decay of the muons. This variation is caused by the existence of an average initial polarization of the muon beam and a non-zero value of g-2 for the muon. We demonstrate that it is feasible to determine the energy scale of the machine with this method to a few parts per million using data collected during 1000 turns.

Rajendran Raja; Alvin Tollestrup

1998-01-06T23:59:59.000Z

443

Design of the Proposed Low Energy Ion Collider Ring at Jefferson Lab  

SciTech Connect (OSTI)

The polarized Medium energy Electron-Ion Collider (MEIC) envisioned at Jefferson Lab will cover a range of center-of-mass energies up to 65 GeV. The present MEIC design could also allow the accommodation of low energy electron-ion collisions (LEIC) for additional science reach. This paper presents the first design of the low energy ion collider ring which is converted from the large ion booster of MEIC. It can reach up to 25 GeV energy for protons and equivalent ion energies of the same magnetic rigidity. An interaction region and an electron cooler designed for MEIC are integrated into the low energy collider ring, in addition to other required new elements including crab cavities and ion spin rotators, for later reuse in MEIC itself. A pair of vertical chicanes which brings the low energy ion beams to the plane of the electron ring and back to the low energy ion ring are also part of the design.

Nissen, Edward W. [JLAB; Lin, Fanglei [JLAB; Morozov, Vasiliy [JLAB; Zhang, Yuhong [JLAB

2013-06-01T23:59:59.000Z

444

Higgs boson exempt no-scale supersymmetry and its collider and cosmology implications  

SciTech Connect (OSTI)

One of the most straightforward ways to address the flavor problem of low-energy supersymmetry is to arrange for the scalar soft terms to vanish simultaneously at a scale M{sub c} much larger than the electroweak scale. This occurs naturally in a number of scenarios, such as no-scale models, gaugino mediation, and several models with strong conformal dynamics. Unfortunately, the most basic version of this approach that incorporates gaugino mass unification and zero scalar masses at the grand unification scale is not compatible with collider and dark matter constraints. However, experimental constraints can be satisfied if we exempt the Higgs bosons from flowing to zero mass value at the high scale. We survey the theoretical constructions that allow this and investigate the collider and dark matter consequences. A generic feature is that the sleptons are relatively light. Because of this, these models frequently give a significant contribution to the anomalous magnetic moment of the muon, and neutralino-slepton coannihilation can play an important role in obtaining an acceptable dark matter relic density. Furthermore, the light sleptons give rise to a large multiplicity of lepton events at colliders, including a potentially suggestive clean trilepton signal at the Tevatron, and a substantial four lepton signature at the LHC.

Evans, Jason L.; Morrissey, David E.; Wells, James D. [Michigan Center for Theoretical Physics (MCTP), Physics Department, University of Michigan, Ann Arbor, Michigan 48109 (United States)

2007-03-01T23:59:59.000Z

445

Study of high pressure gas filled RF cavities for muon collider  

E-Print Network [OSTI]

Muon collider is a considerable candidate of the next-generation high-energy lepton collider machine. Operating an RF cavity in a multi-Tesla magnet is a critical requirement in a muon accelerator and a cooling channel. However, the maximum RF gradient in a vacuum RF cavity is strongly limited by an external magnetic field. Dense hydrogen gas filled RF cavity has been proposed since it is functional of generating a high RF accelerating gradient in a strong magnetic field and making an ionization cooling process at the same time. A critical issue of the cavity is a beam- induced plasma that consumes a considerable amount of RF power. The gas filled RF test cell was made and measured the RF loading due to a beam-induced plasma by using an intense proton beam at Fermilab. By doping an electronegative gas in dense hydrogen, the plasma loading effect is significantly mitigated. The result shows that the cavity is functional with a muon collider beam. Recent progress is shown in this presentation.

Yonehara, Katsuya

2015-01-01T23:59:59.000Z

446

eRHIC Design Study: An Electron-Ion Collider at BNL  

E-Print Network [OSTI]

This document presents BNL's plan for an electron-ion collider, eRHIC, a major new research tool that builds on the existing RHIC facility to advance the long-term vision for Nuclear Physics to discover and understand the emergent phenomena of Quantum Chromodynamics (QCD), the fundamental theory of the strong interaction that binds the atomic nucleus. We describe the scientific requirements for such a facility, following up on the community wide 2012 white paper, "Electron-Ion Collider: the Next QCD Frontier", and present a design concept that incorporates new, innovative accelerator techniques to provide a cost-effective upgrade of RHIC with polarized electron beams colliding with the full array of RHIC hadron beams. The new facility will deliver electron-nucleon luminosity of $\\sim10^{33} cm^{-2}sec^{-1}$ for collisions of 15.9 GeV polarized electrons on either 250 GeV polarized protons or 100 GeV/u heavy ion beams. The facility will also be capable of providing an electron beam energy of 21.2 GeV, at reduced luminosity. We discuss the on-going R\\&D effort to realize the project, and present key detector requirements and design ideas for an experimental program capable of making the "golden measurements" called for in the EIC-White Paper.

E. C. Aschenauer; M. D. Baker; A. Bazilevsky; K. Boyle; S. Belomestnykh; I. Ben-Zvi; S. Brooks; C. Brutus; T. Burton; S. Fazio; A. Fedotov; D. Gassner; Y. Hao; Y. Jing; D. Kayran; A. Kiselev; M. A. C. Lamont; J. -H. Lee; V. N. Litvinenko; C. Liu; T. Ludlam; G. Mahler; G. McIntyre; W. Meng; F. Meot; T. Miller; M. Minty; B. Parker; I. Pinayev; V. Ptitsyn; T. Roser; M. Stratmann; E. Sichtermann; J. Skaritka; O. Tchoubar; P. Thieberger; T. Toll; D. Trbojevic; N. Tsoupas; J. Tuozzolo; T. Ullrich; E. Wang; G. Wang; Q. Wu; W. Xu; L. Zheng

2014-09-05T23:59:59.000Z

447

ELECTRON POLARIZATION IN THE MEDIUM-ENERGY ELECTRON-ION COLLIDER AT JLAB  

SciTech Connect (OSTI)

A key feature of the Medium-energy Electron-Ion Collider (MEIC) at Jefferson Lab is high polarization (over 80%) of the electron beam at all collision points for the particle physics program. The equilibrium electron polarization is arranged to be vertical in the arcs of the figure-8 collider ring of the MEIC and anti-parallel to the arc dipole magnetic fields, in order to take advantage of the preservation of polarization by the Sokolov-Ternov (S-T) effect. Longitudinal polarization is achieved at collision points by utilizing energy-independent universal spin rotators each of which consists of a set of solenoids and dipoles placed at the end of an arc. The equilibrium beam polarization and its lifetime depend on competition between the S-T effect and radiative depolarization. The latter must be suppressed by spin matching. This paper reports on investigations of polarization in the MEIC electron collider ring and a preliminary estimate of beam polarization from calculations using the code SLICK.

Fanglei Lin, Yaroslav Derbenev, Vasiliy Morozov, Yuhong Zhang, Desmond Barber

2012-07-01T23:59:59.000Z

448

Is there Koba-Nielsen-Olesen scaling at Fermilab Tevatron collider energies (16002000 GeV)?  

Science Journals Connector (OSTI)

It is shown that the parton branching distribution Pmn of m quarks and n gluons does not obey exact Kobu-Nielsen-Olesen scaling. When the quark evolution is neglected the probability distribution becomes wider as energy increases in agreement with experimental data. In this model it is predicted that the widening of the probability distribution will stop at Fermilab Tevatron Collider energies (16002000 GeV). Also given are theoretical predictions for the multiplicities and moments for Tevatron Collider energies.

Ina Sarcevic

1987-07-27T23:59:59.000Z

449

Radio-frequency quadrupole resonator for linear accelerator  

DOE Patents [OSTI]

An RFQ resonator for a linear accelerator having a reduced level of interfering modes and producing a quadrupole mode for focusing, bunching and accelerating beams of heavy charged particles, with the construction being characterized by four elongated resonating rods within a cylinder with the rods being alternately shorted and open electrically to the shell at common ends of the rods to provide an LC parallel resonant circuit when activated by a magnetic field transverse to the longitudinal axis.

Moretti, A.

1982-10-19T23:59:59.000Z

450

Level structure of Fr215  

Science Journals Connector (OSTI)

The structure of Fr215 has been studied via the Pb208 (11B, 4n?)215Fr reaction at beam energies from 45 to 66 MeV. In-beam ?-ray spectroscopy techniques, including ?-ray excitation function, x-ray-? coincidence, ?-? coincidence, ?-ray angular distribution, and ?-ray linear polarization measurements were used to construct a level scheme up to a spin value J=(41/2) at an excitation energy of 3405 keV. Definite parity assignments were made up to the (39/2)- state. The structure of this nucleus is compared with that observed in the other N=128 isotopes and predictions of shell model calculations.

M. W. Drigert; J. A. Cizewski; M. S. Rosenthal

1985-07-01T23:59:59.000Z

451

Reticle stage based linear dosimeter  

DOE Patents [OSTI]

A detector to measure EUV intensity employs a linear array of photodiodes. The detector is particularly suited for photolithography systems that includes: (i) a ringfield camera; (ii) a source of radiation; (iii) a condenser for processing radiation from the source of radiation to produce a ringfield illumination field for illuminating a mask; (iv) a reticle that is positioned at the ringfield camera's object plane and from which a reticle image in the form of an intensity profile is reflected into the entrance pupil of the ringfield camera, wherein the reticle moves in a direction that is transverse to the length of the ringfield illumination field that illuminates the reticle; (v) detector for measuring the entire intensity along the length of the ringfield illumination field that is projected onto the reticle; and (vi) a wafer onto which the reticle imaged is projected from the ringfield camera.

Berger, Kurt W. (Livermore, CA)

2007-03-27T23:59:59.000Z

452

On extreme Bosonic linear channels  

E-Print Network [OSTI]

The set of all channels with fixed input and output is convex. We first give a convenient formulation of necessary and sufficient condition for a channel to be extreme point of this set in terms of complementary channel, a notion of big importance in quantum information theory. This formulation is based on the general approach to extremality of completely positive maps in an operator algebra due to Arveson. We then apply this formulation to prove the main result of this note: under certain nondegeneracy conditions, purity of the environment is necessary and sufficient for extremality of Bosonic linear (quasi-free) channel. It follows that Gaussian channel between finite-mode Bosonic systems is extreme if and only if it has minimal noise.

A. S. Holevo

2011-11-15T23:59:59.000Z

453

Linear Transformer Ideal Transformer Consider linear and ideal transformers attached to Circuit 1 and Circuit 2.  

E-Print Network [OSTI]

Linear Transformer Ideal Transformer I1 + V2 _ + V1 _ Consider linear and ideal transformers in linear transformer equations for :MLL ,, 21 ( ) ( ) ( ) ( ) ( ) ( ) 12212212 2 1 112 2 12 2 1 2212 2 PP Now solve the linear transformer equations for the currents: 1 212 2 22 2 1 2 1 212 2 22 12 2 2 2

Kozick, Richard J.

454

Estimating the economic cost of sea-level rise  

E-Print Network [OSTI]

(cont.) In the case of a classical linear sea-level rise of one meter per century, the use of DIVA generally decreases the protection fraction of the coastline, and results in a smaller protection cost because of high ...

Sugiyama, Masahiro, Ph. D. Massachusetts Institute of Technology

2007-01-01T23:59:59.000Z

455

A Test Facility for the International Linear Collider at SLAC End Station A, for Prototypes of Beam Delivery and IR Components  

SciTech Connect (OSTI)

The SLAC Linac can deliver damped bunches with ILC parameters for bunch charge and bunch length to End Station A. A 10Hz beam at 28.5 GeV energy can be delivered there, parasitic with PEP-II operation. We plan to use this facility to test prototype components of the Beam Delivery System and Interaction Region. We discuss our plans for this ILC Test Facility and preparations for carrying out experiments related to collimator wakefields and energy spectrometers. We also plan an interaction region mockup to investigate effects from backgrounds and beam-induced electromagnetic interference.

Woods, M.; Erickson, R.; Frisch, J.; Hast, C.; Jobe, R.K.; Keller, L.; Markiewicz, T.; Maruyama, T.; McCormick, D.; Nelson, J.; Nelson, T.; Phinney, N.; Raubenheimer, T.; Ross, M.; Seryi, A.; Smith, S.; Szalata, Z.; Tenenbaum, P.; Woodley, M.; /SLAC; Angal-Kalinin, D.; Beard, C.; /Daresbury /CERN /DESY /KEK, Tsukuba /LLNL, Livermore /Lancaster U.

2005-05-23T23:59:59.000Z

456

Linear degeneracy in the semiclassical atom  

Science Journals Connector (OSTI)

If the angular and radial quantum numbers of states with the same binding energy satisfy a linear relation, as is the situation in the Coulomb potential, the spectrum is said to be linearly degenerate. We present a detailed study of the consequences of such linear degeneracy in atomic potentials. One of the results is a new, and more general, derivation of Scotts correction to the Thomas-Fermi energy.

Berthold-Georg Englert and Julian Schwinger

1985-07-01T23:59:59.000Z

457

Physics Beyond the Standard Model: Exotic Leptons and Black Holes at Future Colliders  

E-Print Network [OSTI]

The Standard Model of particle physics has been remarkably successful in describing present experimental results. However, it is assumed to be only a low-energy effective theory which will break down at higher energy scales, theoretically motivated to be around 1 TeV. There are a variety of proposed models of new physics beyond the Standard Model, most notably supersymmetric and extra dimension models. New charged and neutral heavy leptons are a feature of a number of theories of new physics, including the `intermediate scale' class of supersymmetric models. Using a time-of-flight technique to detect the charged leptons at the Large Hadron Collider, the discovery range (in the particular scenario studied in the first part of this thesis) is found to extend up to masses of 950 GeV. Extra dimension models, particularly those with large extra dimensions, allow the possible experimental production of black holes. The remainder of the thesis describes some theoretical results and computational tools necessary to model the production and decay of these miniature black holes at future particle colliders. The grey-body factors which describe the Hawking radiation emitted by higher-dimensional black holes are calculated numerically for the first time and then incorporated in a Monte Carlo black hole event generator; this can be used to model black hole production and decay at next-generation colliders. It is hoped that this generator will allow more detailed examination of black hole signatures and help to devise a method for extracting the number of extra dimensions present in nature.

Christopher M. Harris

2005-02-01T23:59:59.000Z

458

Non-thermal high-energy emission from colliding winds of massive stars  

E-Print Network [OSTI]

Colliding winds of massive star binary systems are considered as potential sites of non-thermal high-energy photon production. This is motivated merely by the detection of synchrotron radio emission from the expected colliding wind location. Here we investigate the properties of high-energy photon production in colliding winds of long-period WR+OB-systems. We found that in the dominating leptonic radiation process anisotropy and Klein-Nishina effects may yield spectral and variability signatures in the gamma-ray domain at or above the sensitivity of current or upcoming gamma-ray telescopes. Analytical formulae for the steady-state particle spectra are derived assuming diffusive particle acceleration out of a pool of thermal wind particles, and taking into account adiabatic and all relevant radiative losses. For the first time we include their advection/convection in the wind collision zone, and distinguish two regions within this extended region: the acceleration region where spatial diffusion is superior to convective/advective motion, and the convection region defined by the convection time shorter than the diffusion time scale. The calculation of the Inverse Compton radiation uses the full Klein-Nishina cross section, and takes into account the anisotropic nature of the scattering process. This leads to orbital flux variations by up to several orders of magnitude which may, however, be blurred by the geometry of the system. The calculations are applied to the typical WR+OB-systems WR 140 and WR 147 to yield predictions of their expected spectral and temporal characteristica and to evaluate chances to detect high-energy emission with the current and upcoming gamma-ray experiments. (abridged)

A. Reimer; M. Pohl; O. Reimer

2005-10-25T23:59:59.000Z

459

Nonthermal High-Energy Emission from Colliding Winds of Massive Stars  

Science Journals Connector (OSTI)

Colliding winds of massive star binary systems are considered as potential sites of nonthermal high-energy photon production. Motivated by the detection of synchrotron radio emission from the colliding wind location, we here investigate the properties of high-energy photon production in colliding winds of long-period WR+OB systems. Analytical formulae for the steady state proton- and electron-particle spectra are derived assuming diffusive particle acceleration out of a pool of thermal wind particles, taking into account adiabatic and all relevant radiative losses, and include advection/convection out of the wind collision zone. This includes analytical approximations for the electron energy losses in the Klein-Nishina transition regime. For the first time in the context of CWB systems, our calculations use the full Klein-Nishina cross section and account for the anisotropy of the inverse Compton scattering process. This leads to orbital flux variations by up to several orders of magnitude, which may, however, be blurred by the system's geometry. Both anisotropy and Klein-Nishina effects may yield characteristic spectral and variability signatures in the ?-ray domain. Since propagation effects lead to a deficit of low-energy particles in the convection-dominated zone, one expects imprints in the radiation spectra. If protons are accelerated to at least several GeV, ?0-decay ?-rays might be observable, depending on the injected electron-to-proton ratio. We show that photon-photon pair production is generally not negligible, potentially affecting the emitted spectrum above ~50 GeV, depending on orbital phase and system inclination. The calculations are applied to the archetypal WR+OB systems WR 140 and WR 147 to predict their expected spectral and temporal characteristics and to assess their detectability with current and upcoming ?-ray experiments.

A. Reimer; M. Pohl; O. Reimer

2006-01-01T23:59:59.000Z

460

Linear PM Generator for Wave Energy Conversion.  

E-Print Network [OSTI]

??The main objective of this thesis is to design a selected version of linear PM generator and to determine the electromechanical characteristics at variable operating (more)

Parthasarathy, Rajkumar

2012-01-01T23:59:59.000Z

Note: This page contains sample records for the topic "level linear collider" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


461

Ultra-high vacuum photoelectron linear accelerator  

DOE Patents [OSTI]

An rf linear accelerator for producing an electron beam. The outer wall of the rf cavity of said linear accelerator being perforated to allow gas inside said rf cavity to flow to a pressure chamber surrounding said rf cavity and having means of ultra high vacuum pumping of the cathode of said rf linear accelerator. Said rf linear accelerator is used to accelerate polarized or unpolarized electrons produced by a photocathode, or to accelerate thermally heated electrons produced by a thermionic cathode, or to accelerate rf heated field emission electrons produced by a field emission cathode.

Yu, David U.L.; Luo, Yan

2013-07-16T23:59:59.000Z

462

Huge market forecast for linear LDPE  

Science Journals Connector (OSTI)

Huge market forecast for linear LDPE ... It now appears that the success of the new technology, which rests largely on energy and equipment cost savings, could be overwhelming. ...

1980-08-25T23:59:59.000Z

463

LED Replacements for Linear Fluorescent Lamps Webcast  

Broader source: Energy.gov [DOE]

In this June 20, 2011 webcast on LED products marketed as replacements for linear fluorescent lamps, Jason Tuenge of the Pacific Northwest National Laboratory (PNNL) discussed current Lighting...

464

Local Linear Learned Image Processing Pipeline  

Science Journals Connector (OSTI)

The local linear learned (L3) algorithm is presented that simultaneously performs the demosaicking, denoising, and color transform calculations of an image processing pipeline for a...

Lansel, Steven; Wandell, Brian

465

Optimization Online - Accelerated Linearized Bregman Method  

E-Print Network [OSTI]

Jun 27, 2011 ... Abstract: In this paper, we propose and analyze an accelerated linearized Bregman (ALB) method for solving the basis pursuit and related...

Bo Huang

2011-06-27T23:59:59.000Z

466

The Linear Engine Pathway of Transformation  

Broader source: Energy.gov [DOE]

This poster highlights the major milestones in the history of the linear engine in terms of technological advances, novel designs, and economic/social impact.

467

Linear conic optimization for nonlinear optimal control  

E-Print Network [OSTI]

Jul 7, 2014 ... 3Faculty of Electrical Engineering, Czech Technical University in Prague, ..... This linear transport equation is classical in fluid mechanics,...

2014-07-07T23:59:59.000Z

468

Gaugino physics of split supersymmetry spectra at the LHC and future proton colliders  

Science Journals Connector (OSTI)

Discovery of the Higgs boson and lack of discovery of superpartners in the first run at the LHC are both predictions of split supersymmetry with thermal dark matter. We discuss what it would take to find gluinos at hadron supercolliders, including the LHC at 14TeV center-of-mass energy, and future pp colliders at 100TeV and 200TeV. We generalize the discussion by reexpressing the search capacity in terms of the gluino to lightest superpartner mass ratio and apply results to other scenarios, such as gauge mediation and mirage mediation.

Sunghoon Jung and James D. Wells

2014-04-02T23:59:59.000Z

469

Dark matter searches in the mono-Z channel at high energy e+e? colliders  

Science Journals Connector (OSTI)

We explore the mono-Z signature for dark matter searches at future high energy e+e? colliders. In the context of effective field theory, we consider two kinds of contact operators describing dark matter interactions with electroweak gauge bosons and with electron/positron, respectively. For five benchmark models, we propose kinematic cuts to distinguish signals from backgrounds for both charged leptonic and hadronic decay modes of the Z boson. We also present the experimental sensitivity to cutoff scales of effective operators and compare it with that of the Fermi-LAT indirect search and demonstrate the gains in significance for the several configurations of polarized beams.

Zhao-Huan Yu; Xiao-Jun Bi; Qi-Shu Yan; Peng-Fei Yin

2014-09-10T23:59:59.000Z

470

Development of the SSC (Superconducting Super Collider) trim coil beam tube assembly  

SciTech Connect (OSTI)

The Superconducting Super Collider uses approx. =9600 dipole magnets. The magnets have been carefully designed to exhibit minimal magnetic field harmonics. However, because of superconductor magnetization effects, iron saturation and conductor/coil positioning errors, certain harmonic errors are possible and must be corrected by use of multipole correctors called trim coils. For the most efficient use of axial space in the magnet, and lowest possible current, a distributed internal correction coil design is planned. The trim coil assembly is secured to the beam tube, a uhv tube with special strength, size, conductivity and vacuum. The report details the SSC trim coil/beam tube assembly specifications, history, and ongoing development.

Skaritka, J.; Kelly, E.; Schneider, W.; Shutt, R.; Thompson, P.; Wanderer, P.; Willen, E.; Bintinger, D.; Coluccio, R.; Schieber, L.

1987-01-01T23:59:59.000Z

471

Addendum to Distinguishing Spins in Decay Chains at the Large Hadron Collider.  

E-Print Network [OSTI]

ar X iv :h ep -p h/ 06 06 21 2v 1 2 0 Ju n 20 06 Preprint typeset in JHEP style - PAPER VERSION CavendishHEP06/15 Addendum to Distinguishing Spins in Decay Chains at the Large Hadron Collider? Christiana Athanasiou1, Christopher G. Lester2... mass distributions of the three observable two-body combinations: dileptons (mll), quark- or antiquark-jet plus positive lepton (mjl+), and jet plus negative lepton (mjl?).1 If P (m|S) represents the normalized probability distribution of any one...

Athanasiou, Christiana; Lester, Christopher G; Smillie, Jennifer M; Webber, Bryan R

472

Model Independent Searches for New Physics at the Fermilab Tevatron Collider  

E-Print Network [OSTI]

The standard model is a successful but limited theory. There is significant theoretical motivation to believe that new physics may appear at the energy scale of a few TeV, the lower end of which is currently probed by the Fermilab Tevatron Collider. The methods used to search for physics beyond the standard model in a model independent way and the results of these searches based on 1.0 fb-1 of data collected with the D0 detector and 2.0 fb^-1 at the CDF detector are presented.

Joel Piper

2009-06-19T23:59:59.000Z

473

Has the QCD Critical Point Been Signaled by Observations at the BNL Relativistic Heavy Ion Collider?  

SciTech Connect (OSTI)

The shear viscosity to entropy ratio ({eta}/s) is estimated for the hot and dense QCD matter created in Au+Au collisions at BNL Relativistic Heavy Ion Collider ({radical}(s{sub NN})=200 GeV). A very low value is found; {eta}/s{approx}0.1, which is close to the conjectured lower bound (1/4{pi}). It is argued that such a low value is indicative of thermodynamic trajectories for the decaying matter which lie close to the QCD critical end point.

Lacey, Roy A.; Ajitanand, N. N.; Alexander, J. M.; Chung, P.; Holzmann, W. G.; Issah, M.; Taranenko, A. [Department of Chemistry, State University of New York at Stony Brook, Stony Brook, New York 11794-3400 (United States); Danielewicz, P. [National Superconducting Cyclotron Laboratory and Department of Physics and Astronomy, Michigan State University, East Lansing, Michigan 48824-1321 (United States); Stoecker, Horst [Institut fuer Theoretische Physik, Johann Wolfgang Goethe-Universitaet D60438 Frankfurt (Germany)

2007-03-02T23:59:59.000Z

474

Design of Electron and Ion Crabbing Cavities for an Electron-Ion Collider  

SciTech Connect (OSTI)

Beyond the 12 GeV upgrade at the Jefferson Lab a Medium Energy Electron-Ion Collider (MEIC) has been considered. In order to achieve the desired high luminosities at the Interaction Points (IP), the use of crabbing cavities is under study. In this work, we will present to-date designs of superconducting cavities, considered for crabbing both ion and electron bunches. A discussion of properties such as peak surface fields and higher-order mode separation will be presented. Keywords: super conducting, deflecting cavity, crab cavity.

Alejandro Castilla Loeza, Geoffrey Krafft, Jean Delayen

2012-07-01T23:59:59.000Z

475

Electron cloud observations and cures in the Relativistic Heavy Ion Collider  

Science Journals Connector (OSTI)

Since 2001, the Relativistic Heavy Ion Collider has experienced electron cloud effects, some of which have limited the beam intensity. These include dynamic pressure rises (including pressure instabilities), tune shifts, a reduction of the instability threshold for bunches crossing the transition energy, and possibly incoherent emittance growth. We summarize the main observations in operation and dedicated experiments as well as countermeasures including baking, nonevaporable getter coated warm beam pipes, solenoids, bunch patterns, antigrazing rings, prepumped cold beam pipes, scrubbing, and operation with long bunches.

W. Fischer, M. Blaskiewicz, J. M. Brennan, H. Huang, H.-C. Hseuh, V. Ptitsyn, T. Roser, P. Thieberger, D. Trbojevic, J. Wei, S. Y. Zhang, and U. Iriso

2008-04-18T23:59:59.000Z

476

Voltage regulation in linear induction accelerators  

DOE Patents [OSTI]

Improvement in voltage regulation in a Linear Induction Accelerator wherein a varistor, such as a metal oxide varistor, is placed in parallel with the beam accelerating cavity and the magnetic core. The non-linear properties of the varistor result in a more stable voltage across the beam accelerating cavity than with a conventional compensating resistance.

Parsons, William M. (Santa Fe, NM)

1992-01-01T23:59:59.000Z

477

Voltage regulation in linear induction accelerators  

DOE Patents [OSTI]

Improvement in voltage regulation in a linear induction accelerator wherein a varistor, such as a metal oxide varistor, is placed in parallel with the beam accelerating cavity and the magnetic core is disclosed. The non-linear properties of the varistor result in a more stable voltage across the beam accelerating cavity than with a conventional compensating resistance. 4 figs.

Parsons, W.M.

1992-12-29T23:59:59.000Z

478

NONEQUILIBRIUM LINEAR BEHAVIOR OF BIOLOGICAL SYSTEMS  

E-Print Network [OSTI]

-phosphorylation in mitochondria (2, 3), sodium transport in frog skin, toad bladder (4) and toad skin (5), and hydrogen ion transport in turtle bladder (6). Linearity has also been noted in a synthetic membrane exhibiting active transport (7). (Linearity as used in these papers and here implies the flow, J, is related to the force, A1

Stanley, H. Eugene

479

Soft materials for linear electromechanical energy conversion  

E-Print Network [OSTI]

We briefly review the literature of linear electromechanical effects of soft materials, especially in synthetic and biological polymers and liquid crystals (LCs). First we describe results on direct and converse piezoelectricity, and then we discuss a linear coupling between bending and electric polarization, which maybe called bending piezoelectricity, or flexoelectricity.

Antal Jakli; Nandor Eber

2014-07-29T23:59:59.000Z

480

Decomposing Linear Programs for Parallel Solution?  

E-Print Network [OSTI]

Decomposing Linear Programs for Parallel Solution? Ali P nar, Umit V. Catalyurek, Cevdet Aykanat in the solution of Linear Programming (LP) problems with block angular constraint matrices has been exploited industrial applications and the advent of powerful computers have in- creased the users' ability to formulate

?atalyürek, ?mit V.

Note: This page contains sample records for the topic "level linear collider" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


481

Decomposing Linear Programs for Parallel Solution ?  

E-Print Network [OSTI]

Decomposing Linear Programs for Parallel Solution ? Ali Pinar, ¨ Umit V. C¸ ataly¨urek, Cevdet in the solution of Linear Programming (LP) problems with block angular constraint matrices has been exploited with successful industrial applications and the advent of powerful computers have in­ creased the users' ability

?atalyürek, ?mit V.

482

Non-linear wave equations Hans Ringstrom  

E-Print Network [OSTI]

105 3. Power type non-linearities 108 4. Global existence for small data 109 5. Observations the Maxwell vacuum equations for an electric and magnetic potential also yields wave equations. In order differential equations (PDE:s) is quite big. The linear theory is based on the fact that by adding two

Ringström, Hans

483

Non-linear wave equations Hans Ringstrom  

E-Print Network [OSTI]

105 3. Power type non-linearities 108 4. Global existence for small data 109 5. Observations boundary conditions. Formulating the Maxwell vacuum equations for an electric and magnetic potential also di#11;erential equations (PDE:s) is quite big. The linear theory is based on the fact that by adding

Ringström, Hans

484

Limma: Linear Models for Microarray Data  

E-Print Network [OSTI]

397 23 Limma: Linear Models for Microarray Data Gordon K. Smyth Abstract A survey is given correction and control spots in conjunction with linear modelling is illustrated on the 7 data. 23.1 Introduction Limma1 is a package for differential expression analysis of data arising from microarray

Smyth, Gordon K.

485

Undergraduate Research at Jefferson Lab - Non-linear Multidimensional  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

Contamination Levels Contamination Levels Previous Project (Contamination Levels) Undergraduate Research Main Index Next Project (Data Acquisition Components) Data Acquisition Components Non-linear Multidimensional Optimization for use in Wire Scanner Fitting Student: Alyssa Henderson School: University of Virginia Mentored By: Alicia Hofler and Balša Terzić To ensure experiment efficiency and quality from the Continuous Electron Beam Accelerator, beam energy, size, and position must be measured. Wire scanners are inserted into the beamline to produce measurements which can obtain beam properties. Extracting physical information from wire scanner measurements begins by fitting Gaussian curves to the data. This study focuses on optimizing and automating this curve-fitting procedure. We use a

486

Probing Dark Forces and Light Hidden Sectors at Low-Energy e+e- Colliders  

SciTech Connect (OSTI)

A dark sector - a new non-Abelian gauge group Higgsed or confined near the GeV scale - can be spectacularly probed in low-energy e{sup +}e{sup -} collisions. A low-mass dark sector can explain the annual modulation signal reported by DAMA/LIBRA and the PAMELA, ATIC, and INTEGRAL observations by generating small mass splittings and new interactions for weak-scale dark matter. Some of these observations may be the first signs of a low-mass dark sector that collider searches can definitively confirm. Production and decay of {Omicron}(GeV)-mass dark states is mediated by a Higgsed Abelian gauge boson that mixes kinetically with hypercharge. Existing data from BaBar, BELLE, CLEO-c, and KLOE may contain thousands of striking dark-sector events with a high multiplicity of leptons that reconstruct mass resonances and possibly displaced vertices. We discuss the production and decay phenomenology of Higgsed and confined dark sectors and propose e{sup +}e{sup -} collider search strategies. We also use the DAMA/LIBRA signal to estimate the production cross-sections and decay lifetimes for dark-sector states.

Essig, Rouven; Schuster, Philip; /SLAC; Toro, Natalia; /Stanford U., ITP

2009-06-19T23:59:59.000Z

487

CMSSM, naturalness and the "fine-tuning price" of the Very Large Hadron Collider  

E-Print Network [OSTI]

The absence of supersymmetry or other new physics at the Large Hadron Collider (LHC) has lead many to question naturalness arguments. With Bayesian statistics, we argue that natural models are most probable and that naturalness is not merely an aesthetic principle. We calculate a probabilistic measure of naturalness, the Bayesian evidence, for the Standard Model (SM) with and without quadratic divergences, confirming that the SM with quadratic divergences is improbable. We calculate the Bayesian evidence for the Constrained Minimal Supersymmetric Standard Model (CMSSM) with naturalness priors in three cases: with only the $M_Z$ measurement; with the $M_Z$ measurement and LHC measurements; and with the $M_Z$ measurement, $m_h$ measurement and a hypothetical null result from a $\\sqrt{s}=100\\,\\text{TeV}$ Very Large Hadron Collider (VLHC) with $3000/\\text{fb}$. The "fine-tuning price" of the VLHC given LHC results would be $\\sim400$, which is slightly less than that of the LHC results given the electroweak scale ($\\sim500$).

Andrew Fowlie

2014-03-13T23:59:59.000Z

488

Stress-energy tensor in colliding plane wave space-times: An approximation procedure  

E-Print Network [OSTI]

In a recent work on the quantization of a massless scalar field in a particular colliding plane wave space-time, we computed the vacuum expectation value of the stress-energy tensor on the physical state which corresponds to the Minkowski vacuum before the collision of the waves. We did such a calculation in a region close to both the Killing-Cauchy horizon and the folding singularities that such a space-time contains. In the present paper, we give a suitable approximation procedure to compute this expectation value, in the conformal coupling case, throughout the causal past of the center of the collision. This will allow us to approximately study the evolution of such an expectation value from the beginning of the collision until the formation of the Killing-Cauchy horizon. We start with a null expectation value before the arrival of the waves, which then acquires nonzero values at the beginning of the collision and grows unbounded towards the Killing-Cauchy horizon. The value near the horizon is compatible with our previous result, which means that such an approximation may be applied to other colliding plane wave space-times. Even with this approximation, the initial modes propagated into the interaction region contain a function which cannot be calculated exactly and to ensure the correct regularization of the stress-energy tensor with the point-splitting technique, this function must be given up to adiabatic order four of approximation.

Miquel Dorca

1997-11-07T23:59:59.000Z

489

Proper motions of new dust in the colliding-wind binary WR 140  

E-Print Network [OSTI]

The eccentric WR+O binary system WR 140 produces dust for a few months at intervals of 7.94 yrs coincident with periastron passage. We present the first resolved images of this dust shell, at binary phases ~0.039 and ~0.055, using aperture masking techniques on the Keck-I telescope to achieve diffraction-limited resolution. Proper motions of approximately 1.1 milliarcsecond per day were detected, implying a distance ~1.5 kpc from the known wind speed. The dust plume observed is not as simple as the ``pinwheel'' nebulae seen around other WR colliding wind binaries, indicating the orbital plane is highly inclined to our line-of-sight and/or the dust formation is very clumpy. Follow-up imaging in the mid-infrared and with adaptive optics is urgently required to track the dust motion further, necessary for unambiguously determining the orbital geometry which we only partially constrain here. With full knowledge of the orbital elements, these infrared images can be used to reconstruct the dust distribution along the colliding wind interface, providing a unique tool for probing the post-shock physical conditions of violent astrophysical flows.

J. D. Monnier; P. G. Tuthill; W. C. Danchi

2002-02-16T23:59:59.000Z

490

High-energy Particle Transport in Three-dimensional Hydrodynamic Models of Colliding-wind Binaries  

Science Journals Connector (OSTI)

Massive stars in binary systems (such as WR 140, WR 147, or ? Carinae) have long been regarded as potential sources of high-energy ?-rays. The emission is thought to arise in the region where the stellar winds collide and produce relativistic particles that subsequently might be able to emit ?-rays. Detailed numerical hydrodynamic simulations have already offered insight into the complex dynamics of the wind collision region (WCR), while independent analytical studies, albeit with simplified descriptions of the WCR, have shed light on the spectra of charged particles. In this paper, we describe a combination of these two approaches. We present a three-dimensional hydrodynamical model for colliding stellar winds and compute spectral energy distributions of relativistic particles for the resulting structure of the WCR. The hydrodynamic part of our model incorporates the line-driven acceleration of the winds, gravity, orbital motion, and the radiative cooling of the shocked plasma. In our treatment of charged particles, we consider diffusive shock acceleration in the WCR and the subsequent cooling via inverse Compton losses (including Klein-Nishina effects), bremsstrahlung, collisions, and other energy loss mechanisms.

K. Reitberger; R. Kissmann; A. Reimer; O. Reimer; G. Dubus

2014-01-01T23:59:59.000Z

491

Independent Oversight Inspection, Stanford Linear Accelerator Center -  

Broader source: Energy.gov (indexed) [DOE]

Stanford Linear Accelerator Stanford Linear Accelerator Center - January 2007 Independent Oversight Inspection, Stanford Linear Accelerator Center - January 2007 January 2007 Inspection of Environment, Safety, and Health Programs at the Stanford Linear Accelerator Center The U.S. Department of Energy (DOE) Office of Independent Oversight, within the Office of Health, Safety and Security, conducted an inspection of environment, safety, and health (ES&H) programs at the DOE Stanford Linear Accelerator Center (SLAC) during October and November 2006. The inspection was performed by Independent Oversight's Office of Environment, Safety and Health Evaluations. Since the 2004 Type A electrical accident, SSO and SLAC have made improvements in many aspects of ES&H programs. However, the deficiencies in

492

Linearity of Climate Response to Increases in Black Carbon Aerosols  

SciTech Connect (OSTI)

The impact of absorbing aerosols on global climate are not completely understood. Here, we present results of idealized experiments conducted with the Community Atmosphere Model (CAM4) coupled to a slab ocean model (CAM4-SOM) to simulate the climate response to increases in tropospheric black carbon aerosols (BC) by direct and semi-direct effects. CAM4-SOM was forced with 0, 1x, 2x, 5x and 10x an estimate of the present day concentration of BC while maintaining their estimated present day global spatial and vertical distribution. The top of the atmosphere (TOA) radiative forcing of BC in these experiments is positive (warming) and increases linearly as the BC burden increases. The total semi-direct effect for the 1x experiment is positive but becomes increasingly negative for higher BC concentrations. The global average surface temperature response is found to be a linear function of the TOA radiative forcing. The climate sensitivity to BC from these experiments is estimated to be 0.42 K $\\textnormal W^{-1} m^{2}$ when the semi-direct effects are accounted for and 0.22 K $\\textnormal W^{-1} m^{2}$ with only the direct effects considered. Global average precipitation decreases linearly as BC increases, with a precipitation sensitivity to atmospheric absorption of 0.4 $\\%$ $\\textnormal W^{-1} \\textnormal m^{2}$ . The hemispheric asymmetry of BC also causes an increase in southward cross-equatorial heat transport and a resulting northward shift of the inter-tropical convergence zone in the simulations at a rate of 4$^{\\circ}$N $\\textnormal PW^{-1}$. Global average mid- and high-level clouds decrease, whereas the low-level clouds increase linearly with BC. The increase in marine stratocumulus cloud fraction over the south tropical Atlantic is caused by increased BC-induced diabatic heating of the free troposphere.

Mahajan, Salil [ORNL; Evans, Katherine J [ORNL; Hack, James J [ORNL; Truesdale, John [National Center for Atmospheric Research (NCAR)

2013-01-01T23:59:59.000Z

493

Signals of an invisibly decaying Higgs in a scalar dark matter scenario: a study for the Large Hadron Collider  

E-Print Network [OSTI]

We consider the collider phenomenology of a singlet Majoron model with softly broken lepton number. Lepton number is spontaneously broken when the real part of a new singlet scalar develops vacuum expectation value. With the additional soft terms violating lepton numbers, the imaginary part of this singlet scalar becomes a massive pseudo-Majoron which can account for the dark matter. In presence of the coupling of the pseudo-Majoron with the Standard Model (SM) Higgs, the SM Higgs mostly decays into a pair of pseudo-Majorons, giving rise to missing transverse energy signals at a hadron collider. Since the Higgs visible decay branching fractions get reduced in presence of this invisible decay mode, the bounds on the SM Higgs mass from the LEP and Tevatron experiments get diluted and the invisible decay channel of the Higgs become important for the discovery of low mass Higgs at the Large Hadron Collider.

Kirtiman Ghosh; Biswarup Mukhopadhyaya; Utpal Sarkar

2011-05-29T23:59:59.000Z

494

Linear Transformations In this Chapter, we will define the notion of a linear transformation between  

E-Print Network [OSTI]

Chapter 6 Linear Transformations In this Chapter, we will define the notion of a linear transformation between two vector spaces V and W which are defined over the same field and prove the most basic transformations is equivalent to matrix theory. We will also study the geometric properties of linear

Carrell, Jim

495

Dynamic characteristics of a jacket type offshore structure considering non-linear behavior of pile foundations  

SciTech Connect (OSTI)

Dynamic characteristics of a typical six legged jacket type platform in Persian Gulf have been studied. An equivalent linearized pile stub has been used to model the pile-soil system. The properties of pile stub have been calculated for different levels of the pile-head deformations resulting from the action of different waves. Natural frequencies and mode shapes of resulting linear models have been determined and compared to each other.

Aaghaakouchak, A.A.; Asgarian, B. [Tarbiat Modarress Univ., Tehran (Iran, Islamic Republic of). Dept. of Civil Engineering

1996-12-31T23:59:59.000Z

496

Collider Detector at Fermilab (CDF): Data from the QCD Group's Research into Properties of the Strong Interaction  

DOE Data Explorer [Office of Scientific and Technical Information (OSTI)]

The Collider Detector at Fermilab (CDF) is a Tevatron experiment at Fermilab. The Tevatron, a powerful particle accelerator, accelerates protons and antiprotons close to the speed of light, and then makes them collide head-on inside the CDF detector. The CDF detector is used to study the products of such collisions. The CDF Physics Group at Fermilab is organized into six working groups, each with a specific focus. The QCD group studies the properties of the strong interaction. Their public web page makes data and numerous figures available from both CDF Runs I and II.

,

497

Collider Detector at Fermilab (CDF): Data from Standard Model and Supersymmetric Higgs Bosons Research of the Higgs Group  

DOE Data Explorer [Office of Scientific and Technical Information (OSTI)]

The Collider Detector at Fermilab (CDF) is a Tevatron experiment at Fermilab. The Tevatron, a powerful particle accelerator, accelerates protons and antiprotons close to the speed of light, and then makes them collide head-on inside the CDF detector. The CDF detector is used to study the products of such collisions. The CDF Physics Group at Fermilab is organized into six working groups, each with a specific focus. The Higgs group searches for Standard Model and Supersymmetric Higgs bosons. Their public web page makes data and numerous figures available from both CDF Runs I and II.

498

On Nuclear Energy Levels  

Science Journals Connector (OSTI)

...research-article On Nuclear Energy Levels K. M. Guggenheimer The formula for the energy levels of the rigid rotator...nuclei. Two kinds of nuclear rotation are discussed...an A relation for the energy levels of different nuclei...

1942-01-01T23:59:59.000Z

499

Search for the Production of Gluinos and Squarks with the CDF II Experiment at the Tevatron Collider  

SciTech Connect (OSTI)

This thesis reports on two searches for the production of squarks and gluinos, supersymmetric partners of the Standard Model (SM) quarks and gluons, using the CDF detector at the Tevatron {radical}s = 1.96 TeV p{bar p} collider. An inclusive search for squarks and gluinos pair production is performed in events with large E{sub T} and multiple jets in the final state, based on 2 fb{sup -1} of CDF Run II data. The analysis is performed within the framework of minimal supergravity (mSUGRA) and assumes R-parity conservation where sparticles are produced in pairs. The expected signal is characterized by the production of multiple jets of hadrons from the cascade decays of squarks and gluinos and large missing transverse energy E{sub T} from the lightest supersymmetric particles (LSP). The measurements are in good agreement with SM predictions for backgrounds. The results are translated into 95% confidence level (CL) upper limits on production cross sections and squark and gluino masses in a given mSUGRA scenario. An upper limit on the production cross section is placed in the range between 1 pb and 0.1 pb, depending on the gluino and squark masses considered. The result of the search is negative for gluino and squark masses up to 392 GeV/c{sup 2} in the region where gluino and squark masses are close to each other, gluino masses up to 280 GeV/c{sup 2} regardless of the squark mass, and gluino masses up to 423 GeV=c2 for squark masses below 378 GeV/c{sup 2}. These results are compatible with the latest limits on squark/gluino production obtained by the D0 Collaboration and considerably improve the previous exclusion limits from direct and indirect searches at LEP and the Tevatron. The inclusive search is then extended to a scenario where the pair production of sbottom squarks is dominant. The new search is performed in a generic MSSM scenario with R-parity conservation. A specific SUSY particle mass hierarchy is assumed such that the sbottom decays exclusively as {tilde b}{sub 1} {yields} b{sub {tilde {chi}}{sub 1}{sup 0}}. The expected signal for direct sbottom pair production is characterized by the presence of two jets of hadrons from the hadronization of the bottom quarks and E=T from the two LSPs in the final state. The events are selected with large E{sub T} and two energetic jets in the final state, and at least one jet is required to be associated with a b quark. The measurements are in good agreement with SM predictions for backgrounds. The results are translated into 95% CL exclusion limits on production cross sections and sbottom and neutralino masses in the given MSSM scenario. Cross sections down to 0.1 pb are excluded for the sbottom mass range considered. Sbottom masses up to 230 GeV/c{sup 2} are excluded at 95% CL for neutralino masses below 70 GeV/c{sup 2}. This analysis increases the previous CDF limit by more than 40 GeV/c{sup 2}. The sensitivity of both the inclusive and the exclusive search is dominated by systematic effects and the results of the two analyses can be considered as conclusive for CDF Run II. With the new energy frontier of the newly commissioned Large Hadron Collider in Geneva, the experience from Tevatron will be of crucial importance in the developing of effective strategies to search for SUSY in the next era of particle physics experiments.

De Lorenzo, Gianluca; /Barcelona, IFAE

2010-05-01T23:59:59.000Z

500

LED Linear Lamps and Troffer Lighting  

Broader source: Energy.gov [DOE]

The CALiPER program performed a series of investigations on linear LED lamps. Each report in the series covers the performance of up to 31 linear LED lamps, which were purchased in late 2012 or 2013. The first report focuses on bare lamp performance of LED T8 replacement lamps and subsequent reports examine performance in various troffers, as well as cost-effectiveness. There is also a concise guidance document that describes the findings of the Series 21 studies and provides practical advice to manufacturers, specifiers, and consumers (Report 21.4: Summary of Linear (T8) LED Lamp Testing , 5 pages, June 2014).