National Library of Energy BETA

Sample records for free-electron laser fel

  1. TESLA-FEL Report 2004-08 LINAC BASED FREE-ELECTRON LASER

    E-Print Network [OSTI]

    TESLA-FEL Report 2004-08 1 LINAC BASED FREE-ELECTRON LASER J. Rossbach Universität Hamburg, Hamburg, Germany Abstract A basic treatment of the principle of the linac-driven free-electron laser (FEL) is given. The first part of the paper describes the FEL in low-gain approximation, and in the second part the high

  2. Ignition feedback regenerative free electron laser (FEL) amplifier

    DOE Patents [OSTI]

    Kim, Kwang-Je (Burr Ridge, IL); Zholents, Alexander (Walnut Creek, CA); Zolotorev, Max (Oakland, CA)

    2001-01-01

    An ignition feedback regenerative amplifier consists of an injector, a linear accelerator with energy recovery, and a high-gain free electron laser amplifier. A fraction of the free electron laser output is coupled to the input to operate the free electron laser in the regenerative mode. A mode filter in this loop prevents run away instability. Another fraction of the output, after suitable frequency up conversion, is used to drive the photocathode. An external laser is provided to start up both the amplifier and the injector, thus igniting the system.

  3. Single-shot measurement of free-electron laser polarization at SDUV-FEL

    E-Print Network [OSTI]

    Feng, Lie; Zhang, Tong; Feng, Chao; Chen, Jianhui; Wang, Xingtao; Lan, Taihe; Shen, Lei; Zhang, Wenyan; Yao, Haifeng; Liu, Xiaoqing; Liu, Bo; Wang, Dong

    2014-01-01

    In this paper, a division-of-amplitude photopolarimeter (DOAP) for measuring the polarization state of free-electron laser (FEL) pulse is described. The incident FEL beam is divided into four separate beams, and four Stokes parameters can be measured in a single-shot. In the crossed-planar undulators experiment at Shanghai deep ultraviolet FEL test facility, this DOAP instrument constructed in house responses accurately and timely while the polarization-state of fully coherent FEL pulses are switched, which is helpful for confirming the crossed-planar undulators technique for short-wavelength FELs.

  4. Master-Oscillator-Power-Amplifier (MOPA) Laser Sources Used as Drive Lasers for Photoinjectors for High-Gain, Free Electron Lasers (FELs)

    E-Print Network [OSTI]

    Anlage, Steven

    Master-Oscillator-Power-Amplifier (MOPA) Laser Sources Used as Drive Lasers for Photoinjectors Milchberg #12;- 1 - Abstract The realization of extremely high gain, and high power in Free Electron Lasers critically on the power and phase stability of the cathode drive laser, and conversely the type of FEL output

  5. 5 (Upgradable to 25 keV) Free Electron Laser (FEL) Facility

    E-Print Network [OSTI]

    York, R C

    2013-01-01

    A Free Electron Laser (FEL) facility utilizing a recirculated Superconducting Radio Frequency (SRF) linear accelerator (linac) provides the opportunity to achieve about five times greater photon energy than an unrecirculated linac of similar cost. > A 4 GeV SRF, cw, electron linac can be used to drive an FEL producing 5 keV photons. The SLAC National Accelerator Laboratory, a Department of Energy (DOE) Basic Energy Sciences (BES) laboratory, proposes to utilize a 4 GeV unrecirculated, SRF, linac in a segment of existing linac tunnel. > For an initial investment similar to that of the proposed SLAC strategy, a recirculated SRF linac system could deliver the 4 GeV electrons for photon energies of 5 keV and provide an upgrade path to photon energies of 25 keV. > Further support amounting to about a third of the initial investment would provide upgrade funds for additional SRF linac and cryogenic capacity sufficient to provide electron energies appropriate for 25 keV photons matching the European XFEL.

  6. VISITOR SAFETY TRAINING CHECKLIST: Free Electron Laser (FEL) Laboratory Under California law and campus policy, the University must provide documented safety training for workers.

    E-Print Network [OSTI]

    Ahlers, Guenter

    VISITOR SAFETY TRAINING CHECKLIST: Free Electron Laser (FEL) Laboratory Under California law and campus policy, the University must provide documented safety training for workers. For FEL visitors, this generally means covering the basic guidelines/tasks below. The FEL management loosely defines a "visitor

  7. Efficiency Enhancement in a Tapered Free Electron Laser by Varying...

    Office of Scientific and Technical Information (OSTI)

    a Tapered Free Electron Laser by Varying the Electron Beam Radius Energy extraction efficiency of a free electron laser (FEL) can be increased when the undulator is tapered after...

  8. Catalac free electron laser

    DOE Patents [OSTI]

    Brau, Charles A. (Los Alamos, NM); Swenson, Donald A. (Los Alamos, NM); Boyd, Jr., Thomas J. (Los Alamos, NM)

    1982-01-01

    A catalac free electron laser using a rf linac (catalac) which acts as a catalyst to accelerate an electron beam in an initial pass through the catalac and decelerate the electron beam during a second pass through the catalac. During the second pass through the catalac, energy is extracted from the electron beam and transformed to energy of the accelerating fields of the catalac to increase efficiency of the device. Various embodiments disclose the use of post linacs to add electron beam energy extracted by the wiggler and the use of supplementary catalacs to extract energy at various energy peaks produced by the free electron laser wiggler to further enhance efficiency of the catalac free electron laser. The catalac free electron laser can be used in conjunction with a simple resonator, a ring resonator or as an amplifier in conjunction with a master oscillator laser.

  9. Simulation of a Standing-Wave Free-Electron Laser

    E-Print Network [OSTI]

    Sharp, W.M.

    2008-01-01

    potential shortcoming of the standing- wa.ve FEL. ReferencesPREPRINT SIMULATION OF A STANDING-WAVE FREE-ELECTRON LASERauthor. SIMULATION OF A STANDING·WAVE FREE-ELECTRON LASEr

  10. FREE ELECTRON LASERS

    E-Print Network [OSTI]

    Colson, W.B.

    2008-01-01

    Vinokurov and Shrinsky is the klystron FEL (sometimes calleda transverse optical klystron FEL, or TOK) where themore they devised an optical klystron so the multicomponent

  11. Design Features of a Planar Hybrid/Permanent Magnet Strong Focusing Undulator for Free Electron Laser (FEL) And Synchrotron Radiation (SR) Applications

    SciTech Connect (OSTI)

    Tatchyn, Roman; /SLAC

    2011-09-09

    Insertion devices for Angstrom-wavelength Free Electron Laser (FEL) amplifiers driven by multi-GeV electron beams generally require distributed focusing substantially stronger than their own natural focusing fields. Over the last several years a wide variety of focusing schemes and configurations have been proposed for undulators of this class, ranging from conventional current-driven quadrupoles external to the undulator magnets to permanent magnet (PM) lattices inserted into the insertion device gap. In this paper we present design studies of a flexible high-field hybrid/PM undulator with strong superimposed planar PM focusing proposed for a 1.5 Angstrom Linac Coherent Light Source (LCLS) driven by an electron beam with a 1 mm-mr normalized emittance. Attainable field parameters, tuning modes, and potential applications of the proposed structure are discussed.

  12. Jefferson Lab's upgraded Free-Electron Laser produces first ligh...

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

    the Navy's goals and expectations and we expect no less from the upgraded FEL." The Free-Electron Laser upgrade project is funded by the Department of Defense's Office of...

  13. Free-electron laser scientist is one of two newly elected American...

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

    Steve Benson Steve Benson of the Free-Electron Laser (FEL) group was recently selected as a 2002 Fellow of the American Physical Society Free-electron laser scientist is one of two...

  14. Free electron laser

    DOE Patents [OSTI]

    Villa, Francesco (Alameda, CA)

    1990-01-01

    A high gain, single-pass free electron laser formed of a high brilliance electron injector source, a linear accelerator which imparts high energy to the electron beam, and an undulator capable of extremely high magnetic fields, yet with a very short period. The electron injector source is the first stage (gap) of the linear accelerator or a radial line transformer driven by fast circular switch. The linear accelerator is formed of a plurality of accelerating gaps arranged in series. These gaps are energized in sequence by releasing a single pulse of energy which propagates simultaneously along a plurality of transmission lines, each of which feeds the gaps. The transmission lines are graduated in length so that pulse power is present at each gap as the accelerated electrons pass therethrough. The transmission lines for each gap are open circuited at their ends. The undualtor has a structure similar to the accelerator, except that the transmission lines for each gap are substantially short circuited at their ends, thus converting the electric field into magnetic field. A small amount of resistance is retained in order to generate a small electric field for replenishing the electron bunch with the energy lost as it traverses through the undulator structure.

  15. George Neil Named to Lead JLab's Free-Electron Laser Program...

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

    Facility (Jefferson Lab). Neil is responsible for managing the Free-Electron Laser (FEL) operations and research programs. The machine uses superconducting radiofrequency...

  16. Airborne Tactical Free-Electron Laser

    SciTech Connect (OSTI)

    Roy Whitney; George Neil

    2007-02-01

    The goal of 100 kilowatts (kW) of directed energy from an airborne tactical platform has proved challenging due to the size and weight of most of the options that have been considered. However, recent advances in Free-Electron Lasers appear to offer a solution along with significant tactical advantages: a nearly unlimited magazine, time structures for periods from milliseconds to hours, radar like functionality, and the choice of the wavelength of light that best meets mission requirements. For an Airborne Tactical Free-Electron Laser (ATFEL) on a platforms such as a Lockheed C-130J-30 and airships, the two most challenging requirements, weight and size, can be met by generating the light at a higher harmonic, aggressively managing magnet weights, managing cryogenic heat loads using recent SRF R&D results, and using FEL super compact design concepts that greatly reduce the number of components. The initial R&D roadmap for achieving an ATFEL is provided in this paper. Performing this R&D is expected to further reduce the weight, size and power requirements for the FELs the Navy is currently developing for shipboard applications, as well as providing performance enhancements for the strategic airborne MW class FELs. The 100 kW ATFEL with its tactical advantages may prove sufficiently attractive for early advancement in the queue of deployed FELs.

  17. Rf Feedback free electron laser

    DOE Patents [OSTI]

    Brau, Charles A. (Los Alamos, NM); Swenson, Donald A. (Los Alamos, NM); Boyd, Jr., Thomas J. (Los Alamos, NM)

    1981-01-01

    A free electron laser system and electron beam system for a free electron laser which use rf feedback to enhance efficiency. Rf energy is extracted from an electron beam by decelerating cavities and returned to accelerating cavities using rf returns such as rf waveguides, rf feedthroughs, etc. This rf energy is added to rf klystron energy to lower the required input energy and thereby enhance energy efficiency of the system.

  18. Free electron laser with masked chicane

    DOE Patents [OSTI]

    Nguyen, Dinh C. (Los Alamos, NM); Carlsten, Bruce E. (Los Alamos, NM)

    1999-01-01

    A free electron laser (FEL) is provided with an accelerator for outputting electron beam pulses; a buncher for modulating each one of the electron beam pulses to form each pulse into longitudinally dispersed bunches of electrons; and a wiggler for generating coherent light from the longitudinally dispersed bunches of electrons. The electron beam buncher is a chicane having a mask for physically modulating the electron beam pulses to form a series of electron beam bunches for input to the wiggler. In a preferred embodiment, the mask is located in the chicane at a position where each electron beam pulse has a maximum dispersion.

  19. Performance study of a soft X-ray harmonic generation FEL seeded with an EUV laser pulse

    E-Print Network [OSTI]

    Gullans, M.; Wurtele, J.S.; Penn, G.; Zholents, A.A.

    2007-01-01

    X-ray Harmonic Generation FEL Seeded with an EUV Laser PulseX-ray harmonic generation FEL seeded with an EUV laser pulseof a free electron laser (FEL) using a low-power extreme

  20. Design Alternatives for a Free Electron Laser Facility

    SciTech Connect (OSTI)

    Jacobs, K; Bosch, R A; Eisert, D; Fisher, M V; Green, M A; Keil, R G; Kleman, K J; Kulpin, J G; Rogers, G C; Wehlitz, R; Chiang, T; Miller, T J; Lawler, J E; Yavuz, D; Legg, R A

    2012-07-01

    The University of Wisconsin-Madison is continuing design efforts for a vacuum ultraviolet/X-ray Free Electron Laser facility. The design incorporates seeding the FEL to provide fully coherent photon output at energies up to {approx}1 keV. The focus of the present work is to minimize the cost of the facility while preserving its performance. To achieve this we are exploring variations in the electron beam driver for the FEL, in undulator design, and in the seeding mechanism. Design optimizations and trade-offs between the various technologies and how they affect the FEL scientific program will be presented.

  1. Free Electron Lasers Seeded by ir Laser Driven High-order Harmonic Generation

    SciTech Connect (OSTI)

    Wu, Juhao; Bolton, Paul R.; /SLAC; Murphy, James B.; /BNL, NSLS; Zhong, Xinming; /Beijing Normal U.

    2007-03-12

    Coherent x-ray production by a seeded free electron laser (FEL) is important for next generation synchrotron light sources. We examine the feasibility and features of FEL emission seeded by a high-order harmonic of an infrared laser (HHG). In addition to the intrinsic FEL chirp, the longitudinal profile and spectral bandwidth of the HHG seed are modified significantly by the FEL interaction well before saturation. This smears out the original attosecond pulselet structure. We introduce criteria for this smearing effect on the pulselet and the stretching effect on the entire pulse. We discuss the noise issue in such a seeded FEL.

  2. Free-Electron Laser | Jefferson Lab

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

    vacuum ultraviolet light, and is also a source of Terahertz light. The FEL uses electrons to produce laser light. The electrons are energized using the lab's superconducting...

  3. FREE ELECTRON LASER FOR SIBERIAN CENTRE FOR PHOTOCHEMICAL RESEARCH: THE CONTROL SYSTEM FOR THE

    E-Print Network [OSTI]

    Kozak, Victor R.

    FREE ELECTRON LASER FOR SIBERIAN CENTRE FOR PHOTOCHEMICAL RESEARCH: THE CONTROL SYSTEM of the Siberian Branch of RAS. Abstract. A control system for the magnetic system of the free electron laser (FEL) is described. The characteristics and structure of the power supply system are presented. The control system

  4. Crystallographic data processing for free-electron laser sources

    SciTech Connect (OSTI)

    White, Thomas A. Barty, Anton; Stellato, Francesco; Holton, James M.; Kirian, Richard A.; Zatsepin, Nadia A.; Chapman, Henry N.

    2013-07-01

    A processing pipeline for diffraction data acquired using the ‘serial crystallography’ methodology with a free-electron laser source is described with reference to the crystallographic analysis suite CrystFEL and the pre-processing program Cheetah. A processing pipeline for diffraction data acquired using the ‘serial crystallography’ methodology with a free-electron laser source is described with reference to the crystallographic analysis suite CrystFEL and the pre-processing program Cheetah. A detailed analysis of the nature and impact of indexing ambiguities is presented. Simulations of the Monte Carlo integration scheme, which accounts for the partially recorded nature of the diffraction intensities, are presented and show that the integration of partial reflections could be made to converge more quickly if the bandwidth of the X-rays were to be increased by a small amount or if a slight convergence angle were introduced into the incident beam.

  5. Free-Electron Laser Targets Fat | Jefferson Lab

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

    Free-Electron Laser Targets Fat April 10, 2006 Free-Electron Laser Scientists Rox Anderson, right, and Free-Electron Laser Scientist Steve Benson, left, discuss laser beam...

  6. Title of Document: EMITTANCE MEASUREMENTS OF THE JEFFERSON LAB FREE ELECTRON LASER

    E-Print Network [OSTI]

    Anlage, Steven

    to be a quality diagnostic that is especially useful for high brightness electron beams such as Jefferson Labs FEL, such as the ones that power Free Electron Lasers (FEL), require high quality (low emittance) beams for efficient operation. Accurate and reliable beam diagnostics are essential to monitoring beam parameters in order

  7. Compact free-electron laser at the Los Alamos National Laboratory

    SciTech Connect (OSTI)

    Chan, K.C.D.; Meier, K.L.; Nguyen, D.; Sheffield, R.L.; Wang, Tai-Sen F.; Warren, R.W.; Wilson, W.L.; Young, L.M.

    1991-01-01

    The design and construction of second-generation free-electron laser (FEL) system at Los Alamos will be described. comprising state-of-the art components, this FEL system will be sufficiently compact, robust and user-friendly for application in industry, medicine, and research. 11 refs., 11 figs., 2 tabs.

  8. Two-gigawatt burst-mode operation of the intense microwave prototype (IMP) free-electron laser (FEL) for the microwave tokamak experiment (MTX)

    SciTech Connect (OSTI)

    Felker, B.; Allen, S.; Bell, H.

    1993-10-06

    The MTX explored the plasma heating effects of 140 GHz microwaves from both Gyrotrons and from the IMP FEL wiggler. The Gyrotron was long pulse length (0.5 seconds maximum) and the FEL produced short-pulse length, high-peak power, single and burst modes of 140 GHZ microwaves. Full-power operations of the IMP FEL wiggler were commenced in April of 1992 and continued into October of 1992. The Experimental Test Accelerator H (ETA-II) provided a 50-nanosecond, 6-MeV, 2--3 kAmp electron beam that was introduced co-linear into the IMP FEL with a 140 GHz Gyrotron master oscillator (MO). The FEL was able to amplify the MO signal from approximately 7 kW to peaks consistently in the range of 1--2 GW. This microwave pulse was transmitted into the MTX and allowed the exploration of the linear and non-linear effects of short pulse, intense power in the MTX plasma. Single pulses were used to explore and gain operating experience in the parameter space of the IMP FEL, and finally evaluate transmission and absorption in the MTX. Single-pulse operations were repeatable. After the MTX was shut down burst-mode operations were successful at 2 kHz. This paper will describe the IMP FEL, Microwave Transmission System to MTX, the diagnostics used for calorimetric measurements, and the operations of the entire Microwave system. A discussion of correlated and uncorrelated errors that affect FEL performance will be made Linear and non-linear absorption data of the microwaves in the MTX plasma will be presented.

  9. Combination free electron and gaseous laser

    DOE Patents [OSTI]

    Brau, Charles A. (Los Alamos, NM); Rockwood, Stephen D. (Los Alamos, NM); Stein, William E. (Los Alamos, NM)

    1980-01-01

    A multiple laser having one or more gaseous laser stages and one or more free electron stages. Each of the free electron laser stages is sequentially pumped by a microwave linear accelerator. Subsequently, the electron beam is directed through a gaseous laser, in the preferred embodiment, and in an alternative embodiment, through a microwave accelerator to lower the energy level of the electron beam to pump one or more gaseous lasers. The combination laser provides high pulse repetition frequencies, on the order of 1 kHz or greater, high power capability, high efficiency, and tunability in the synchronous production of multiple beams of coherent optical radiation.

  10. Suppression of microbunching instability using bending magnets in FEL linacs

    E-Print Network [OSTI]

    Qiang, Ji

    2014-01-01

    using bending magnets in FEL linacs Ji Qiang, Chad E.for free electron laser (FEL) radiation. In this letter, weaccelerators for next generation FEL light sources. Instead

  11. Beam conditioning for free electron lasers: Consequences and methods A. Wolski, G. Penn, A. Sessler, and J. Wurtele*

    E-Print Network [OSTI]

    Wurtele, Jonathan

    Beam conditioning for free electron lasers: Consequences and methods A. Wolski, G. Penn, A. Sessler short-wavelength free-electron lasers (FELs) demands electron beams with very small transverse emittance operation with larger electron beam emit- tances than would otherwise be possible. The analysis in Ref. [1

  12. 1578 IEEEJOURNAL OF QUANTUMELECTRONICS.VOL.QE-23, NO. 9. SEPTEMBER 1987 Free-Electron Lasers with Electromagnetic Standing

    E-Print Network [OSTI]

    Wurtele, Jonathan

    with Electromagnetic Standing Wave Wimlers T. M. TRAN, BRUCE G. DANLY, Abstrucf-A detailed analysis of the electroniagnetic standing wave wiggler for free-electron lasers (FEL's) is conducted for both circular and linear is that the elec- tromagnetic standing wave wiggler FEL, under certain circumstances, exhibits a rich harmonic

  13. High Average Power Operation of a Scraper-Outcoupled Free-Electron Laser

    SciTech Connect (OSTI)

    Michelle D. Shinn; Chris Behre; Stephen Vincent Benson; Michael Bevins; Don Bullard; James Coleman; L. Dillon-Townes; Tom Elliott; Joe Gubeli; David Hardy; Kevin Jordan; Ronald Lassiter; George Neil; Shukui Zhang

    2004-08-01

    We describe the design, construction, and operation of a high average power free-electron laser using scraper outcoupling. Using the FEL in this all-reflective configuration, we achieved approximately 2 kW of stable output at 10 um. Measurements of gain, loss, and output mode will be compared with our models.

  14. Short pulse free electron laser amplifier

    DOE Patents [OSTI]

    Schlitt, Leland G. (Livermore, CA); Szoke, Abraham (Fremont, CA)

    1985-01-01

    Method and apparatus for amplification of a laser pulse in a free electron laser amplifier where the laser pulse duration may be a small fraction of the electron beam pulse duration used for amplification. An electron beam pulse is passed through a first wiggler magnet and a short laser pulse to be amplified is passed through the same wiggler so that only the energy of the last fraction, f, (f<1) of the electron beam pulse is consumed in amplifying the laser pulse. After suitable delay of the electron beam, the process is repeated in a second wiggler magnet, a third, . . . , where substantially the same fraction f of the remainder of the electron beam pulse is consumed in amplification of the given short laser pulse in each wiggler magnet region until the useful electron beam energy is substantially completely consumed by amplification of the laser pulse.

  15. Spectro-temporal shaping of seeded free-electron laser pulses

    E-Print Network [OSTI]

    Gauthier, David; De Ninno, Giovanni; Allaria, Enrico; Cinquegrana, Paolo; Danailov, Miltcho Boyanov; Demidovich, Alexander; Ferrari, Eugenio; Giannessi, Luca; Mahieu, Benoît; Penco, Giuseppe

    2015-01-01

    We demonstrate the ability to control and shape the spectro-temporal content of extreme-ultraviolet (XUV) pulses produced by a seeded free-electron laser (FEL). The control over the spectro-temporal properties of XUV light was achieved by precisely manipulating the linear frequency chirp of the seed laser. Our results agree with existing theory, which allows retrieving the temporal properties (amplitude and phase) of the FEL pulse from measurements of the spectra as a function of the FEL operating parameters. Furthermore, we show the first direct evidence of the full temporal coherence of FEL light and generate Fourier limited pulses by fine-tuning the FEL temporal phase. The possibility to tailor the spectro-temporal content of intense short-wavelength pulses represents the first step towards efficient nonlinear optics in the XUV to X-ray spectral region and will enable precise manipulation of core-electron excitations using the methods of coherent quantum control.

  16. Time-dependent simulation of prebunched one and two-beam free electron laser

    SciTech Connect (OSTI)

    Mirian, N. S.; Maraghechi, B.

    2014-04-15

    A numerical simulation in one-dimension is conducted to study the slippage effects on prebunched free electron laser. A technique for the simulation of time dependent free electron lasers (FEL) to model the slippage effects is introduced, and the slowly varying envelope approximation in both z and t is used to illustrate the temporal behaviour in the prebunched FEL. Slippage effect on prebunched two-beam FEL is compared with the one-beam modeling. The evaluation of the radiation pulse energy, thermal and phase distribution, and radiation pulse shape in one-beam and two-beam modeling is studied. It was shown that the performance is considerably undermined when the slippage time is comparable to the pulse duration. However, prebunching reduces the slippage. Prebunching also leads to the radiation pulse with a single smooth spike.

  17. Status of the visible Free-Electron Laser at the Brookhaven Accelerator Test Facility

    SciTech Connect (OSTI)

    Batchelor, K.; Ben-Zvi, I.; Fernow, R.C.; Fisher, A.S.; Friedman, A.; Gallardo, J.; Ingold, G.; Kirk, H.; Kramer, S.; Lin, L.; Rogers, J.T.; Sheehan, J.F.; van Steenbergen, A.; Woodle, M.; Xie, J.; Yu, L.H.; Zhang, R. ); Bhowmik, A. . Rocketdyne Div.)

    1991-01-01

    The 500 nm Free-Electron Laser (ATF) of the Brookhaven National Laboratory is reviewed. We present an overview of the ATF, a high-brightness, 50-MeV, electron accelerator and laser complex which is a users' facility for accelerator and beam physics. A number of laser acceleration and FEL experiments are under construction at the ATF. The visible FEL experiment is based on a novel superferric 8.8 mm period undulator. The electron beam parameters, the undulator, the optical resonator, optical and electron beam diagnostics are discussed. The operational status of the experiment is presented. 22 refs., 7 figs.

  18. Ultraviolet Free Electron Laser Facility preliminary design report

    SciTech Connect (OSTI)

    Ben-Zvi, I.

    1993-02-01

    This document, the Preliminary Design Report (PDR) for the Brookhaven Ultraviolet Free Electron Laser (UV FEL) facility, describes all the elements of a facility proposed to meet the needs of a research community which requires ultraviolet sources not currently available as laboratory based lasers. Further, for these experiments, the requisite properties are not extant in either the existing second or upcoming third generation synchrotron light sources. This document is the result of our effort at BNL to identify potential users, determine the requirements of their experiments, and to design a facility which can not only satisfy the existing need, but have adequate flexibility for possible future extensions as need dictates and as evolving technology allows. The PDR is comprised of three volumes. In this, the first volume, background for the development of the proposal is given, including descriptions of the UV FEL facility, and representative examples of the science it was designed to perform. Discussion of the limitations and potential directions for growth are also included. A detailed description of the facility design is then provided, which addresses the accelerator, optical, and experimental systems. Information regarding the conventional construction for the facility is contained in an addendum to volume one (IA).

  19. An optical parametric chirped-pulse amplifier for seeding high repetition rate free-electron lasers

    DOE Public Access Gateway for Energy & Science Beta (PAGES Beta)

    Höppner, H.; Hage, A.; Tanikawa, T.; Schulz, M.; Riedel, R.; Teubner, U.; Prandolini, M. J.; Faatz, B.; Tavella, F.

    2015-05-15

    High repetition rate free-electron lasers (FEL), producing highly intense extreme ultraviolet and x-ray pulses, require new high power tunable femtosecond lasers for FEL seeding and FEL pump-probe experiments. A tunable, 112 W (burst mode) optical parametric chirped-pulse amplifier (OPCPA) is demonstrated with center frequencies ranging from 720–900 nm, pulse energies up to 1.12 mJ and a pulse duration of 30 fs at a repetition rate of 100 kHz. Since the power scalability of this OPCPA is limited by the OPCPA-pump amplifier, we also demonstrate a 6.7–13.7 kW (burst mode) thin-disk OPCPA-pump amplifier, increasing the possible OPCPA output power to manymore »hundreds of watts. Furthermore, third and fourth harmonic generation experiments are performed and the results are used to simulate a seeded FEL with high-gain harmonic generation.« less

  20. Start-to-end modelling of a mode-locked optical klystron free electron laser amplifier

    SciTech Connect (OSTI)

    Dunning, D. J.; Thompson, N. R. [University of Strathclyde (SUPA), Glasgow G4 0NG (United Kingdom); ASTeC, Daresbury Laboratory, Warrington WA4 4AD (United Kingdom); Mc Neil, B. W. J. [University of Strathclyde (SUPA), Glasgow G4 0NG (United Kingdom); Williams, P. H. [ASTeC, Daresbury Laboratory, Warrington WA4 4AD (United Kingdom)

    2011-07-15

    A free electron laser (FEL) in a mode-locked optical klystron (MLOK) configuration is modelled using start-to-end simulations that simulate realistic electron beam acceleration and transport before input into a full three-dimensional FEL simulation code. These simulations demonstrate that the MLOK scheme is compatible with the present generation of radiofrequency accelerator designs. A train of few-optical cycle pulses is predicted with peak powers similar to those of the equivalent conventional FEL amplifier. The role of electron beam energy modulation in these results is explained and the limitations of some simulation codes discussed. It is shown how seeding the FEL interaction using a High Harmonic seed laser can improve the coherence properties of the output.

  1. The History of X-ray Free-Electron Lasers

    SciTech Connect (OSTI)

    Pellegrini, C.; ,

    2012-06-28

    The successful lasing at the SLAC National Accelerator Laboratory of the Linear Coherent Light Source (LCLS), the first X-ray free-electron laser (X-ray FEL), in the wavelength range 1.5 to 15 {angstrom}, pulse duration of 60 to few femtoseconds, number of coherent photons per pulse from 10{sup 13} to 10{sup 11}, is a landmark event in the development of coherent electromagnetic radiation sources. Until now electrons traversing an undulator magnet in a synchrotron radiation storage ring provided the best X-ray sources. The LCLS has set a new standard, with a peak X-ray brightness higher by ten orders of magnitudes and pulse duration shorter by three orders of magnitudes. LCLS opens a new window in the exploration of matter at the atomic and molecular scales of length and time. Taking a motion picture of chemical processes in a few femtoseconds or less, unraveling the structure and dynamics of complex molecular systems, like proteins, are some of the exciting experiments made possible by LCLS and the other X-ray FELs now being built in Europe and Asia. In this paper, we describe the history of the many theoretical, experimental and technological discoveries and innovations, starting from the 1960s and 1970s, leading to the development of LCLS.

  2. Nuclear Instruments and Methods in Physics Research A 528 (2004) 1518 First lasing at the high-power free electron laser at Siberian

    E-Print Network [OSTI]

    Kozak, Victor R.

    2004-01-01

    in April 2003 on a high-power free electron laser (FEL) constructed at the Siberian CenterNuclear Instruments and Methods in Physics Research A 528 (2004) 15­18 First lasing at the high-power free electron laser at Siberian center for photochemistry research E.A. Antokhin, R.R. Akberdin, V

  3. Rippled beam free electron laser amplifier

    DOE Patents [OSTI]

    Carlsten, Bruce E. (Los Alamos, NM)

    1999-01-01

    A free electron laser amplifier provides a scalloping annular electron beam that interacts with the axial electric field of a TM.sub.0n mode. A waveguide defines an axial centerline and, a solenoid arranged about the waveguide produces an axial constant magnetic field within the waveguide. An electron beam source outputs a annular electron beam that interacts with the axial magnetic field to have an equilibrium radius and a ripple radius component having a variable radius with a ripple period along the axial centerline. An rf source outputs an axial electric field that propagates within the waveguide coaxial with the electron beam and has a radial mode that interacts at the electron beam at the equilibrium radius component of the electron beam.

  4. Purified self-amplified spontaneous emission free-electron lasers...

    Office of Scientific and Technical Information (OSTI)

    Purified self-amplified spontaneous emission free-electron lasers with slippage-boosted filtering Citation Details In-Document Search Title: Purified self-amplified spontaneous...

  5. The TeraFERMI terahertz source at the seeded FERMI free-electron-laser facility

    SciTech Connect (OSTI)

    Perucchi, A. [Sincrotrone Trieste S.C.p.A., Area Science Park, I-34012 Basovizza, Trieste (Italy); INSTM UdR Trieste-ST, Area Science Park, I-34012 Basovizza, Trieste (Italy); Di Mitri, S.; Penco, G.; Allaria, E. [Sincrotrone Trieste S.C.p.A., Area Science Park, I-34012 Basovizza, Trieste (Italy); Lupi, S. [CNR-IOM and Dipartimento di Fisica, Universita di Roma 'La Sapienza', P.le Aldo Moro 2, I-00185 Roma (Italy)

    2013-02-15

    We describe the project for the construction of a terahertz (THz) beamline to be called TeraFERMI at the seeded FERMI free electron laser (FEL) facility in Trieste, Italy. We discuss topics as the underlying scientific case, the choice of the source, the expected performance, and THz beam propagation. Through electron beam dynamics simulations we show that the installation of the THz source in the beam dump section provides a new approach for compressing the electron bunch length without affecting FEL operation. Thanks to this further compression of the FEL electron bunch, the TeraFERMI facility is expected to provide THz pulses with energies up to the mJ range during normal FEL operation.

  6. SEEDED VISA: A 1064nm LASER-SEEDED FEL AMPLIFIER AT THE M. Dunning, G. Andonian, E. Hemsing, S. Reiche, J. Rosenzweig

    E-Print Network [OSTI]

    Brookhaven National Laboratory

    SEEDED VISA: A 1064nm LASER-SEEDED FEL AMPLIFIER AT THE BNL ATF M. Dunning, G. Andonian, E. Hemsing Free Electron Laser (FEL) using the VISA undulator and a Nd:YAG seed laser will be performed for a short Rayleigh length FEL amplifier at 1 micron to allow for high power transmission with min- imal

  7. Compact X-ray Free Electron Laser from a Laser-plasma Accelerator...

    Office of Scientific and Technical Information (OSTI)

    Language: English Subject: 43 PARTICLE ACCELERATORS; ACCELERATORS; ELECTRON BEAMS; ELECTRONS; FREE ELECTRON LASERS; LASERS; PERFORMANCE; PLASMA GUNS; RADIATIONS; WIGGLER MAGNETS...

  8. FEL fr Fussgnger FEL fr Fussgnger Dirk.Noelle@desy.deDirk.Noelle@desy.de

    E-Print Network [OSTI]

    FEL für Fussgänger FEL für Fussgänger Dirk Nölle DESY, MDI 9-2579 Dirk ein Free-Electron-Laser? ­ Klassischer" Laser und FEL­ ,,Klassischer Laser und FEL ­ Eine kleiner (historischer) Überblick ­ Das Funktionsprinzip ­ Beispiele für verschiedene FEL Typenp yp ­ SASE 2 #12;TESLA

  9. High Efficiency, Multi-Terawatt X-ray free electron lasers

    E-Print Network [OSTI]

    Emma, Claudio; Wu, Juhao; Pellegrini, Claudio

    2015-01-01

    We study high efficiency, multi-terawatt peak power, few angstrom wavelength, X-ray Free Electron Lasers (X-ray FELs). To obtain these characteristics we consider an optimized undulator design: superconducting, helical, with short period and built-in strong focusing. This design reduces the length of the breaks between modules, decreasing diffraction effects, and allows using a stronger transverse electron focusing. Both effects reduce the gain length and the overall undulator length. The peak power and efficiency depend on the transverse electron beam distribution and on time dependent effects, like synchrotron sideband growth. The last effect is identified as the main cause for reduction of electron beam microbunching and FEL peak power. We show that the optimal functional form for the undulator magnetic field tapering profile, yielding the maximum output power, depends significantly on these effects. The output power achieved when neglecting time dependent effects for an LCLS-like X-ray FEL with a 100 m lo...

  10. Macroparticle Theory of a Standing Wave Free-Electron Laser Two-Beam Accelerator

    E-Print Network [OSTI]

    Takayama, K.

    2008-01-01

    Macroparticle Theory of a Standing Wave Free-Electron LaserMacroparticle Theory of a Standing Wave Free-Electron LaserMacroparticle Theory of a Standing Wave Free-Electron Laser

  11. Free electron laser using Rf coupled accelerating and decelerating structures

    DOE Patents [OSTI]

    Brau, Charles A. (Los Alamos, NM); Swenson, Donald A. (Los Alamos, NM); Boyd, Jr., Thomas J. (Los Alamos, NM)

    1984-01-01

    A free electron laser and free electron laser amplifier using beam transport devices for guiding an electron beam to a wiggler of a free electron laser and returning the electron beam to decelerating cavities disposed adjacent to the accelerating cavities of the free electron laser. Rf energy is generated from the energy depleted electron beam after it emerges from the wiggler by means of the decelerating cavities which are closely coupled to the accelerating cavities, or by means of a second bore within a single set of cavities. Rf energy generated from the decelerated electron beam is used to supplement energy provided by an external source, such as a klystron, to thereby enhance overall efficiency of the system.

  12. Single electron beam rf feedback free electron laser

    DOE Patents [OSTI]

    Brau, C.A.; Stein, W.E.; Rockwood, S.D.

    1981-02-11

    A free electron laser system and electron beam system for a free electron laser which uses rf feedback to enhance efficiency are described. Rf energy is extracted from a single electron beam by decelerating cavities and energy is returned to accelerating cavities using rf returns, such as rf waveguides, rf feedthroughs, resonant feedthroughs, etc. This rf energy is added to rf klystron energy to reduce the required input energy and thereby enhance energy efficiency of the system.

  13. Feasibility considerations of a soft-x-ray distributed feedback laser pumped by an X-FEL

    E-Print Network [OSTI]

    Paris-Sud XI, Université de

    1 Feasibility considerations of a soft-x-ray distributed feedback laser pumped by an X-FEL Jean feedback laser (DFL) pumped by an x- ray free electron laser (X-FEL). The DFL under consideration is a Mg/SiC bi-layered Bragg reflector pumped by a single X-FEL bunch at 57.4 eV, stimulating the Mg L2

  14. Axial interaction free-electron laser

    DOE Patents [OSTI]

    Carlsten, B.E.

    1997-09-02

    Electron orbits from a helical axial wiggler in an axial guide field are absolutely unstable as power is extracted from the particles. For off-axis beams an axial FEL mechanism exists when the axial electric field in a TM mode is wiggled to interact with the axial velocity of the electrons that form the beam. The interaction strength is comparable to that for helical FELs and is insensitive to beam orbit errors. The orbits for this mechanism are extremely stable in the absence of space charge and lead to high extraction efficiencies without particle phasing incoherence or interception. This interaction mechanism is suitable for use with intense annular electron beams for high power generation at microwave frequencies. 5 figs.

  15. Axial interaction free-electron laser

    DOE Patents [OSTI]

    Carlsten, Bruce E. (Los Alamos, NM)

    1997-01-01

    Electron orbits from a helical axial wiggler in an axial guide field are absolutely unstable as power is extracted from the particles. For off-axis beams an axial FEL mechanism exists when the axial electric field in a TM mode is wiggled to interact with the axial velocity of the electrons that form the beam. The interaction strength is comparable to that for helical FELs and is insensitive to beam orbit errors. The orbits for this mechanism are extremely stable in the absence of space charge and lead to high extraction efficiencies without particle phasing incoherence or interception. This interaction mechanism is suitable for use with intense annular electron beams for high power generation at microwave frequencies.

  16. Phase stability of a standing-wave free-electron laser

    E-Print Network [OSTI]

    Sharp, W.M.

    2008-01-01

    J. S. Wurtele, "Simulation of a Standing-Wave Free-ElectronPhase Stability of a Standing-Wave Free-Electron Laser W. M.Phase stability of a standing-wave free-electron laser W. M.

  17. Experiments in sideband suppression on the Los Alamos National Laboratory Free-Electron Laser

    SciTech Connect (OSTI)

    White, C.J.; Coyle, M.R.; Paxton, A.H. (Mission Research Corp., Albuquerque, NM (United States). Laser and Optical R and D Group); O'Shea, P.G.; Bender, S.C.; Byrd, D.A.; Feldman, D.W.; Goldstein, J.C.: Pitcher, E.J.; Zaugg, T.J. (Los Alamos National Lab., NM (United States))

    1993-01-01

    Two versions of the Phase-Step Mirror'' (PSM), a novel optical component that prevents the formation of sidebands in a Free-Electron Laser (FEL) were tested on the Los Alamos National Laboratory (LANL) APEX FEL. Sideband suppression and frequency control with high extraction efficiency and single line, transform limited operation were demonstrated. The results of our LANL experiments and computer simulations showed that for very high gain applications, the first-order sideband is completely suppressed, but the laser gain is so strong that on about pass 300 the sideband at the second-order or next free spectral range of the PSM appears. This second-order sideband may be suppressed by designing a PSM with grooves having two alternating depths, one chosen to suppress the first-order sideband, and the other, the second-order sideband.

  18. Experiments in sideband suppression on the Los Alamos National Laboratory Free-Electron Laser

    SciTech Connect (OSTI)

    White, C.J.; Coyle, M.R.; Paxton, A.H. [Mission Research Corp., Albuquerque, NM (United States). Laser and Optical R and D Group; O`Shea, P.G.; Bender, S.C.; Byrd, D.A.; Feldman, D.W.; Goldstein, J.C.: Pitcher, E.J.; Zaugg, T.J. [Los Alamos National Lab., NM (United States)

    1993-06-01

    Two versions of the ``Phase-Step Mirror`` (PSM), a novel optical component that prevents the formation of sidebands in a Free-Electron Laser (FEL) were tested on the Los Alamos National Laboratory (LANL) APEX FEL. Sideband suppression and frequency control with high extraction efficiency and single line, transform limited operation were demonstrated. The results of our LANL experiments and computer simulations showed that for very high gain applications, the first-order sideband is completely suppressed, but the laser gain is so strong that on about pass 300 the sideband at the second-order or next free spectral range of the PSM appears. This second-order sideband may be suppressed by designing a PSM with grooves having two alternating depths, one chosen to suppress the first-order sideband, and the other, the second-order sideband.

  19. Sequential single shot X-ray photon correlation spectroscopy at the SACLA free electron laser

    DOE Public Access Gateway for Energy & Science Beta (PAGES Beta)

    Lehmkühler, Felix; Kwa?niewski, Pawe?; Roseker, Wojciech; Fischer, Birgit; Schroer, Martin A.; Tono, Kensuke; Katayama, Tetsuo; Sprung, Michael; Sikorski, Marcin; Song, Sanghoon; et al

    2015-11-27

    In this study, hard X-ray free electron lasers allow for the first time to access dynamics of condensed matter samples ranging from femtoseconds to several hundred seconds. In particular, the exceptional large transverse coherence of the X-ray pulses and the high time-averaged flux promises to reach time and length scales that have not been accessible up to now with storage ring based sources. However, due to the fluctuations originating from the stochastic nature of the self-amplified spontaneous emission (SASE) process the application of well established techniques such as X-ray photon correlation spectroscopy (XPCS) is challenging. Here we demonstrate a single-shotmore »based sequential XPCS study on a colloidal suspension with a relaxation time comparable to the SACLA free-electron laser pulse repetition rate. High quality correlation functions could be extracted without any indications for sample damage. This opens the way for systematic sequential XPCS experiments at FEL sources.« less

  20. Two-dimensional optimization of free electron laser designs

    DOE Patents [OSTI]

    Prosnitz, Donald (Walnut Creek, CA); Haas, Roger A. (Pleasanton, CA)

    1985-01-01

    Off-axis, two-dimensional designs for free electron lasers that maintain correspondence of a light beam with a "synchronous electron" at an optimal transverse radius r>0 to achieve increased beam trapping efficiency and enhanced laser beam wavefront control so as to decrease optical beam diffraction and other deleterious effects.

  1. Two-dimensional optimization of free-electron-laser designs

    DOE Patents [OSTI]

    Prosnitz, D.; Haas, R.A.

    1982-05-04

    Off-axis, two-dimensional designs for free electron lasers are described that maintain correspondence of a light beam with a synchronous electron at an optimal transverse radius r > 0 to achieve increased beam trapping efficiency and enhanced laser beam wavefront control so as to decrease optical beam diffraction and other deleterious effects.

  2. Resonator design for a visible wavelength free-electron laser (*)

    SciTech Connect (OSTI)

    Bhowmik, A.; Lordi, N. . Rocketdyne Div.); Ben-Zvi, I.; Gallardo, J. )

    1990-01-01

    Design requirements for a visible wavelength free-electron laser being developed at the Accelerator Test Facility at Brookhaven National Laboratory are presented along with predictions of laser performance from 3-D numerical simulations. The design and construction of the optical resonator, its alignment and control systems are also described. 15 refs., 8 figs., 4 tabs.

  3. Spectrometer for X-ray emission experiments at FERMI free-electron-laser

    SciTech Connect (OSTI)

    Poletto, L., E-mail: poletto@dei.unipd.it; Frassetto, F.; Miotti, P. [CNR - Institute of Photonics and Nanotechnologies (CNR-IFN), via Trasea 7, I-35131 Padova (Italy); Di Cicco, A.; Iesari, F. [Physics Division, School of Science and Technology, Università di Camerino, I-62032 Camerino (Italy); Finetti, P. [ELETTRA - Sincrotrone Trieste, Basovizza Area Science Park, S. S. 14 - km 163,5, I-34149, Basovizza (TS) (Italy); Grazioli, C. [Department of Chemical and Pharmaceutical Sciences, University of Trieste, Via L. Giorgieri 1, I-34127 Trieste (Italy); CNR-Istituto Officina dei Materiali (CNR-IOM), Laboratorio TASC, I-34149 Trieste (Italy); Kivimäki, A. [CNR-Istituto Officina dei Materiali (CNR-IOM), Laboratorio TASC, I-34149 Trieste (Italy); Stagira, S. [Politecnico di Milano – Department of Physics, I-20133 Milano (Italy); Coreno, M. [ELETTRA - Sincrotrone Trieste, Basovizza Area Science Park, S. S. 14 - km 163,5, I-34149, Basovizza (TS) (Italy); CNR – Istituto di Struttura della Materia (CNR-ISM), UOS Basovizza, I-34149 Trieste (Italy)

    2014-10-15

    A portable and compact photon spectrometer to be used for photon in-photon out experiments, in particular x-ray emission spectroscopy, is presented. The instrument operates in the 25–800 eV energy range to cover the full emissions of the FEL1 and FEL2 stages of FERMI. The optical design consists of two interchangeable spherical varied-lined-spaced gratings and a CCD detector. Different input sections can be accommodated, with/without an entrance slit and with/without an additional relay mirror, that allow to mount the spectrometer in different end-stations and at variable distances from the target area both at synchrotron and at free-electron-laser beamlines. The characterization on the Gas Phase beamline at ELETTRA Synchrotron (Italy) is presented.

  4. Multifrequency, single pass free electron laser

    DOE Patents [OSTI]

    Szoke, Abraham (Fremont, CA); Prosnitz, Donald (Walnut Creek, CA)

    1985-01-01

    A method for simultaneous amplification of laser beams with a sequence of frequencies in a single pass, using a relativistic beam of electrons grouped in a sequence of energies corresponding to the sequence of laser beam frequencies. The method allows electrons to pass from one potential well or "bucket" to another adjacent bucket, thus increasing efficiency of trapping and energy conversion.

  5. Metal Photocathodes for Free Electron Laser Applications

    E-Print Network [OSTI]

    Greaves, Corin Michael Ricardo

    2012-01-01

    uSXRD orientation map of the LCLS Photocathode. The field ofimage of the center of the LCLS photocathode. The horizontalsize of the laser spot in LCLS. The image was taken with a

  6. A tapered undulator experiment at the ELBE far infrared hybrid-resonator oscillator free electron laser

    SciTech Connect (OSTI)

    Asgekar, V.; Lehnert, U.; Michel, P.

    2012-01-15

    A tapered undulator experiment was carried out at the ELBE far-infrared free electron laser (FEL). The oscillator FEL makes use of a hybrid optical resonator. The main motivation was to see whether the presence of a dispersive medium in the form of a waveguide in the resonator has any effect on the outcome. The FEL saturated power and the wavelength shifts have been measured as a function of both positive as well as negative undulator field amplitude tapering. In contrast to the typical high-gain FELs where positive tapering proves beneficial for the output power we observed an improvement of performance at negative taper. During the same experiments we studied the characteristics of the detuning curves. The width of the curves indicates a maximum small signal gain for zero taper while the output peak power increases with negative taper. The saturated power output, the detuning curve characteristics, and the wavelength shifts agrees with the theoretical predictions. Details of the experiment are presented.

  7. Reversible Electron Beam Heating for Suppression of Microbunching Instabilities at Free-Electron Lasers

    SciTech Connect (OSTI)

    Behrens, Christopher; /DESY; Huang, Zhirong; Xiang, Dao; /SLAC

    2012-05-30

    The presence of microbunching instabilities due to the compression of high-brightness electron beams at existing and future x-ray free-electron lasers (FELs) results in restrictions on the attainable lasing performance and renders beam imaging with optical transition radiation impossible. The instability can be suppressed by introducing additional energy spread, i.e., heating the electron beam, as demonstrated by the successful operation of the laser heater system at the Linac Coherent Light Source. The increased energy spread is typically tolerable for self-amplified spontaneous emission FELs but limits the effectiveness of advanced FEL schemes such as seeding. In this paper, we present a reversible electron beam heating system based on two transverse deflecting radio-frequency structures (TDSs) upstream and downstream of a magnetic bunch compressor chicane. The additional energy spread is introduced in the first TDS, which suppresses the microbunching instability, and then is eliminated in the second TDS. We show the feasibility of the microbunching gain suppression based on calculations and simulations including the effects of coherent synchrotron radiation. Acceptable electron beam and radio-frequency jitter are identified, and inherent options for diagnostics and on-line monitoring of the electron beam's longitudinal phase space are discussed.

  8. Acceleration of electrons using an inverse free electron laser auto- accelerator

    SciTech Connect (OSTI)

    Wernick, I.K.; Marshall, T.C.

    1992-07-01

    We present data from our study of a device known as the inverse free electron laser. First, numerical simulations were performed to optimize the design parameters for an experiment that accelerates electrons in the presence of an undulator by stimulated absorption of radiation. The Columbia free electron laser (FEL) was configured as an auto-accelerator (IFELA) system; high power (MW's) FEL radiation at {approximately}1.65 mm is developed along the first section of an undulator inside a quasi-optical resonator. The electron beam then traverses a second section of undulator where a fraction of the electrons is accelerated by stimulated absorption of the 1.65 mm wavelength power developed in the first undulator section. The second undulator section has very low gain and does not generate power on its own. We have found that as much as 60% of the power generated in the first section can be absorbed in the second section, providing that the initial electron energy is chosen correctly with respect to the parameters chosen for the first and second undulators. An electron momentum spectrometer is used to monitor the distribution of electron energies as the electrons exit the IFELA. We have found; using our experimental parameters, that roughly 10% of the electrons are accelerated to energies as high as 1100 keV, in accordance with predictions from the numerical model. The appearance of high energy electrons is correlated with the abrupt absorption of millimeter power. The autoaccelerator configuration is used because there is no intense source of coherent power at the 1.65 mm design wavelength other than the FEL.

  9. Acceleration of electrons using an inverse free electron laser auto- accelerator

    SciTech Connect (OSTI)

    Wernick, I.K.; Marshall, T.C.

    1992-07-01

    We present data from our study of a device known as the inverse free electron laser. First, numerical simulations were performed to optimize the design parameters for an experiment that accelerates electrons in the presence of an undulator by stimulated absorption of radiation. The Columbia free electron laser (FEL) was configured as an auto-accelerator (IFELA) system; high power (MW`s) FEL radiation at {approximately}1.65 mm is developed along the first section of an undulator inside a quasi-optical resonator. The electron beam then traverses a second section of undulator where a fraction of the electrons is accelerated by stimulated absorption of the 1.65 mm wavelength power developed in the first undulator section. The second undulator section has very low gain and does not generate power on its own. We have found that as much as 60% of the power generated in the first section can be absorbed in the second section, providing that the initial electron energy is chosen correctly with respect to the parameters chosen for the first and second undulators. An electron momentum spectrometer is used to monitor the distribution of electron energies as the electrons exit the IFELA. We have found; using our experimental parameters, that roughly 10% of the electrons are accelerated to energies as high as 1100 keV, in accordance with predictions from the numerical model. The appearance of high energy electrons is correlated with the abrupt absorption of millimeter power. The autoaccelerator configuration is used because there is no intense source of coherent power at the 1.65 mm design wavelength other than the FEL.

  10. Locking Lasers to RF in an Ultra Fast FEL

    E-Print Network [OSTI]

    Wilcox, R.

    2011-01-01

    Lasers to RF in an Ultrafast FEL R. B . Wilcox, G . Huang,the X-ray pulses from the FEL. The phase-locked loop on the

  11. Chirped pulse inverse free-electron laser vacuum accelerator

    DOE Patents [OSTI]

    Hartemann, Frederic V. (Dublin, CA); Baldis, Hector A. (Pleasanton, CA); Landahl, Eric C. (Walnut Creek, CA)

    2002-01-01

    A chirped pulse inverse free-electron laser (IFEL) vacuum accelerator for high gradient laser acceleration in vacuum. By the use of an ultrashort (femtosecond), ultrahigh intensity chirped laser pulse both the IFEL interaction bandwidth and accelerating gradient are increased, thus yielding large gains in a compact system. In addition, the IFEL resonance condition can be maintained throughout the interaction region by using a chirped drive laser wave. In addition, diffraction can be alleviated by taking advantage of the laser optical bandwidth with negative dispersion focusing optics to produce a chromatic line focus. The combination of these features results in a compact, efficient vacuum laser accelerator which finds many applications including high energy physics, compact table-top laser accelerator for medical imaging and therapy, material science, and basic physics.

  12. Control of the polarization of a vacuum-ultraviolet, high-gain, free-electron laser

    SciTech Connect (OSTI)

    Allaria, Enrico; Diviacco, Bruno; Callegari, Carlo; Finetti, Paola; Mahieu, Benoît; Viefhaus, Jens; Zangrando, Marco; De Ninno, Giovanni; Lambert, Guillaume; Ferrari, Eugenio; Buck, Jens; Ilchen, Markus; Vodungbo, Boris; Mahne, Nicola; Svetina, Cristian; Spezzani, Carlo; Di Mitri, Simone; Penco, Giuseppe; Trovó, Mauro; Fawley, William M.; Rebernik, Primoz R.; Gauthier, David; Grazioli, Cesare; Coreno, Marcello; Ressel, Barbara; Kivimäki, Antti; Mazza, Tommaso; Glaser, Leif; Scholz, Frank; Seltmann, Joern; Gessler, Patrick; Grünert, Jan; De Fanis, Alberto; Meyer, Michael; Knie, André; Moeller, Stefan P.; Raimondi, Lorenzo; Capotondi, Flavio; Pedersoli, Emanuele; Plekan, Oksana; Danailov, Miltcho B.; Demidovich, Alexander; Nikolov, Ivaylo; Abrami, Alessandro; Gautier, Julien; Lüning, Jan; Zeitoun, Philippe; Giannessi, Luca

    2014-12-02

    The two single-pass, externally seeded free-electron lasers (FELs) of the FERMI user facility are designed around Apple-II-type undulators that can operate at arbitrary polarization in the vacuum ultraviolet-to-soft x-ray spectral range. Furthermore, within each FEL tuning range, any output wavelength and polarization can be set in less than a minute of routine operations. We report the first demonstration of the full output polarization capabilities of FERMI FEL-1 in a campaign of experiments where the wavelength and nominal polarization are set to a series of representative values, and the polarization of the emitted intense pulses is thoroughly characterized by three independent instruments and methods, expressly developed for the task. The measured radiation polarization is consistently >90% and is not significantly spoiled by the transport optics; differing, relative transport losses for horizontal and vertical polarization become more prominent at longer wavelengths and lead to a non-negligible ellipticity for an originally circularly polarized state. The results from the different polarimeter setups validate each other, allow a cross-calibration of the instruments, and constitute a benchmark for user experiments.

  13. Control of the polarization of a vacuum-ultraviolet, high-gain, free-electron laser

    DOE Public Access Gateway for Energy & Science Beta (PAGES Beta)

    Allaria, Enrico; Diviacco, Bruno; Callegari, Carlo; Finetti, Paola; Mahieu, Benoît; Viefhaus, Jens; Zangrando, Marco; De Ninno, Giovanni; Lambert, Guillaume; Ferrari, Eugenio; et al

    2014-12-02

    The two single-pass, externally seeded free-electron lasers (FELs) of the FERMI user facility are designed around Apple-II-type undulators that can operate at arbitrary polarization in the vacuum ultraviolet-to-soft x-ray spectral range. Furthermore, within each FEL tuning range, any output wavelength and polarization can be set in less than a minute of routine operations. We report the first demonstration of the full output polarization capabilities of FERMI FEL-1 in a campaign of experiments where the wavelength and nominal polarization are set to a series of representative values, and the polarization of the emitted intense pulses is thoroughly characterized by three independentmore »instruments and methods, expressly developed for the task. The measured radiation polarization is consistently >90% and is not significantly spoiled by the transport optics; differing, relative transport losses for horizontal and vertical polarization become more prominent at longer wavelengths and lead to a non-negligible ellipticity for an originally circularly polarized state. The results from the different polarimeter setups validate each other, allow a cross-calibration of the instruments, and constitute a benchmark for user experiments.« less

  14. Standing-Wave Free-Electron Laser Two-Beam Accelerator

    E-Print Network [OSTI]

    Sessler, Andrew M.

    2008-01-01

    in Physics Research A Standing-Wave Free-Electron Laser Two-AC03-76SF00098 LBL-30418 Standing-Wave Free-Electron LaserNo. W-740S-ENG-48. Standing-wave free-electron laser two-

  15. New Laser's "First Light" Shatters Record | Jefferson...

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

    National Accelerator Facility have delivered first light from their Free Electron Laser (FEL). Only 2 years after ground was broken for the FEL, infrared light of more than...

  16. Bendable Focusing X-Ray Optics for the ALS and the LCLS/FEL: Design, Metrology, and Performance

    E-Print Network [OSTI]

    Yashchuk, V. V.

    2010-01-01

    Optics for the ALS and the LCLS/FEL: Design, Metrology, andLCLS) x-ray free electron laser (FEL) at the Stanford LinearKB mirrors used at the SLAC/FEL AMO beamline. Two mirrors

  17. Self-field effects on instability of wave modes in a two-stream free-electron laser with an axial magnetic field

    SciTech Connect (OSTI)

    Mohsenpour, Taghi Rezaee Rami, Omme Kolsoum

    2014-07-15

    Free electron lasers (FEL) play major roles in the Raman Regime, due to the charge and current densities of the beam self-field. The method of perturbation has been applied to study the influence of self-electric and self-magnetic fields. A dispersion relation for two-stream free electron lasers with a helical wiggler and an axial magnetic field has been found. This dispersion relation is solved numerically to investigate the influence of self-fields on the FEL coupling and the two-stream instability. It was found that self-fields can produce very large effects on the FEL coupling, but they have almost negligible effects on two-stream instability.

  18. High Resolution Simulation of Beam Dynamics in Electron Linacs for Free Electron Lasers

    SciTech Connect (OSTI)

    Ryne, R.D.; Venturini, M.; Zholents, A.A.; Qiang, J.

    2009-01-05

    In this paper we report on large scale multi-physics simulation of beam dynamics in electron linacs for next generation free electron lasers (FELs). We describe key features of a parallel macroparticle simulation code including three-dimensional (3D) space-charge effects, short-range structure wake fields, longitudinal coherent synchrotron radiation (CSR) wake fields, and treatment of radiofrequency (RF) accelerating cavities using maps obtained from axial field profiles. A macroparticle up-sampling scheme is described that reduces the shot noise from an initial distribution with a smaller number of macroparticles while maintaining the global properties of the original distribution. We present a study of the microbunching instability which is a critical issue for future FELs due to its impact on beam quality at the end of the linac. Using parameters of a planned FEL linac at Lawrence Berkeley National Laboratory (LBNL), we show that a large number of macroparticles (beyond 100 million) is needed to control numerical shot noise that drives the microbunching instability. We also explore the effect of the longitudinal grid on simulation results. We show that acceptable results are obtained with around 2048 longitudinal grid points, and we discuss this in view of the spectral growth rate predicted from linear theory. As an application, we present results from simulations using one billion macroparticles of the FEL linac under design at LBNL. We show that the final uncorrelated energy spread of the beam depends not only on the initial uncorrelated energy spread but also depends strongly on the shape of the initial current profile. By using a parabolic initial current profile, 5 keV initial uncorrelated energy spread at 40 MeV injection energy, and improved linac design, those simulations demonstrate that a reasonable beam quality can be achieved at the end of the linac, with the final distribution having about 100 keV energy spread, 2.4 GeV energy, and 1.2 kA peak current.

  19. High-power beam injectors for 100 KW free-electron lasers

    SciTech Connect (OSTI)

    Todd, A. M.; Wood R. L.; Bluem, H.; Young, L. M.; Wiseman, M.; Schultheiss, T.; Schrage, D. L.; Russell, S. J.; Rode, C. H.; Rimmer, R.; Nguyen, D. C.; Kelley, J. P.; Kurennoy, S.; wood, r

    2003-01-01

    A key technology issue on the path to high-power FEL operation is the demonstration of reliable, high-brightness, high-power injector operation. We describe two ongoing programs to produce 100 mA injectors as drivers for 100 kW free-electron lasers. In one approach, in collaboration with the Thomas Jefferson National Accelerator Facility, we are fabricating a 750 MHz superconducting RF cryomodule that will be integrated with a room-temperature DC photocathode gun and tested at the Laboratory. In the other approach, in collaboration with Los Alamos National Laboratory, a high-current 700 MHz, normal-conducting, RF photoinjector is being designed and will undergo thermal management testing at the Laboratory. We describe the design, the projected performance and the status of both injectors.

  20. Sensing the wavefront of x-ray free-electron lasers using aerosol spheres

    SciTech Connect (OSTI)

    Loh, N.Duane; Starodub, Dimitri; Lomb, Lukas; Hampton, Christina Y.; Martin, Andrew V.; Sierra, Raymond G.; Barty, Anton; Aquila, Andrew; Schulz, Joachim; Steinbrener, Jan; Shoeman, Robert L.; Kassemeyer, Stephan; Bostedt, Christoph; Bozek, John; Epp, Sascha W.; Erk, Benjamin; Hartmann, Robert; Rolles, Daniel; Rudenko, Artem; Rudek, Benedikt; Foucar, Lutz

    2014-04-22

    Characterizing intense, focused x-ray free electron laser (FEL) pulses is crucial for their use in diffractive imaging. We describe how the distribution of average phase tilts and intensities on hard x-ray pulses with peak intensities of 10 21 W/m2 can be retrieved from an ensemble of diffraction patterns produced by 70 nm-radius polystyrene spheres, in a manner that mimics wave-front sensors. Besides showing that an adaptive geometric correction may be necessary for diffraction data from randomly injected sample sources, the paper demonstrates the possibility of collecting statistics on structured pulses using only the diffraction patterns they generate and highlights the imperative to study its impact on single-particle diffractive imaging.

  1. Compact two-beam push-pull free electron laser

    DOE Patents [OSTI]

    Hutton, Andrew (Yorktown, VA)

    2009-03-03

    An ultra-compact free electron laser comprising a pair of opposed superconducting cavities that produce identical electron beams moving in opposite directions such that each set of superconducting cavities accelerates one electron beam and decelerates the other electron beam. Such an arrangement, allows the energy used to accelerate one beam to be recovered and used again to accelerate the second beam, thus, each electron beam is decelerated by a different structure than that which accelerated it so that energy exchange rather than recovery is achieved resulting in a more compact and highly efficient apparatus.

  2. A Free-Electron Laser in the Pulsar Magnetosphere

    E-Print Network [OSTI]

    P. -K. Fung; J. Kuijpers

    2004-05-18

    We have studied systematically the free-electron laser in the context of high brightness pulsar radio emission. In this paper, we have numerically examined the case where a transverse electromagnetic wave is distorting the motion of a relativistic electron beam while travelling over one stellar radius ($ approx 10 :{km}$). For different sets of parameters, coherent emission is generated by bunches of beam electrons in the radio domain, with bandwidths of 3 GHz. Pulse power often reached $10^{13} :{W}$, which corresponds with brightness temperature of $10^{30} :{K}$. The duration of these pulses is of the order of nanoseconds. In the context of pulsar radio emission, our results indicate that the laser can produce elementary bursts of radiation which build up the observed microstructures of a few tens of microseconds duration. The process is sensitive mostly to the beam particles energy, number density and the background magnetic field, but much less so to the transverse wave parameters. We demonstrate that the operation of a free-electron laser with a transverse electromagnetic wiggler in the pulsar magnetosphere occurs preferably at moder ate Lorentz factors $ gamma geq 100$, high beam density $n gtrsim 0.1 n_{textrm{GJ}}(r_ ast)$ where $n_{textrm{GJ}}(r_ ast)$ is the Goldrei ch-Julian density at a stellar radius $r_ ast$, and finally, at large altitude where the background magnetic field is low $B_0 leq 10^{-2} textrm{T}$.

  3. R&D for a Soft X-Ray Free Electron Laser Facility

    SciTech Connect (OSTI)

    Corlett, John; Attwood, David; Byrd, John; Denes, Peter; Falcone, Roger; Heimann, Phil; Leemans, Wim; Padmore, Howard; Prestemon, Soren; Sannibale, Fernando; Schlueter, Ross; Schroeder, Carl; Staples, John; Venturini, Marco; Warwick, Tony; Wells, Russell; Wilcox, Russell; Zholent, Alexander; Adolphsen, Chris; Arthur, John; Bergmann, Uwe; Cai, Yunhai; Colby, Eric; Dowell, David; Emma, Paul; Fox, John; Frisch, Josef; Galayda, John; Hettel, Robert; Huang, Zhirong; Phinney, Nan; Rabedeau, Tom; Raubenheimer, Tor; Reis, David; Schmerge, John; Stöhr, Joachim; Stupakov, Gennady; White, Bill; Xiang, Dao

    2009-06-08

    Several recent reports have identified the scientific requirements for a future soft x-ray light source, and a high-repetition-rate free-electron laser (FEL) facility that is responsive to these requirements is now on the horizon. R&D in some critical areas is needed, however, to demonstrate technical performance, thus reducing technical risks and construction costs. Such a facility most likely will be based on a CW superconducting linear accelerator with beam supplied by a high-brightness, high-repetition-rate photocathode electron gun operating in CW mode, and on an array of FELs to which the accelerated beam is distributed, each operating at high repetition rate and with even pulse spacing. Dependent on experimental requirements, the individual FELs can be configured for either self-amplified spontaneous emission (SASE), seeded, or oscillator mode of operation, including the use of high-gain harmonic generation (HGHG), echo-enhanced harmonic generation (EEHG), harmonic cascade, or other configurations. In this White Paper we identify the overall accelerator R&D needs, and highlight the most important pre-construction R&D tasks required to value-engineer the design configuration and deliverables for such a facility. In Section 1.4 we identify the comprehensive R&D ultimately needed. We identify below the highest-priority requirements for understanding machine performance and reduce risk and costs at this pre-conceptual design stage. Details of implementing the required tasks will be the subject of future evaluation. Our highest-priority R&D program is the injector, which must be capable of delivering a beam with bunches up to a nanocoulomb at MHz repetition rate and with normalized emittance {le} 1 mm {center_dot} mrad. This will require integrated accelerating structure, cathode, and laser systems development. Cathode materials will impact the choice of laser technology in wavelength and energy per pulse, as well as vacuum requirements in the accelerating structure. Demonstration experiments in advanced seeding techniques, such as EEHG, and other optical manipulations to enhance the FEL process are required to reduce technical risk in producing temporally coherent and ultrashort x-ray output using optical seed lasers. Success of EEHG in particular would result in reduced development and cost of laser systems and accelerator hardware for seeded FELs. With a 1.5-2.5 GeV linac, FELs could operate in the VUV-soft x-ray range, where the actual beam energy will be determined by undulator technology; for example, to use the lower energy would require the use of advanced designs for which undulator R&D is needed. Significant reductions in both unit costs and accelerator costs resulting from the lower electron beam energy required to achieve lasing at a particular wavelength could be obtained with undulator development. Characterization of the wakefields of the vacuum chambers in narrow-gap undulators will be needed to minimize risk in ability to deliver close to transform limited pulses. CW superconducting RF technology for an FEL facility with short bunches at MHz rate and up to mA average current will require selection of design choices in cavity frequency and geometry, higher order mode suppression and power dissipation, RF power supply and distribution, accelerating gradient, and cryogenics systems. R&D is needed to define a cost and performance optimum. Developments in laser technology are proceeding at rapid pace, and progress in high-power lasers, harmonic generation, and tunable sources will need to be tracked.

  4. fel 2005 :: Free Electron Laser Conference and Workshop

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

    AFDC Printable Version Share this resource Send a link to EERE: Alternative Fuels Data Center Home Page to someone by E-mail Share EERE: Alternative Fuels Data Center Home Page on Facebook Tweet about EERE: Alternative Fuels Data Center Home Page on Twitter Bookmark EERE: Alternative Fuels Data Center Homesum_a_epg0_fpd_mmcf_m.xls" ,"Available from WebQuantityBonneville Power AdministrationRobust,Field-effectWorkingLosThe 26th Annual Conference on FossilFateOctober 2013 Home | Attendee

  5. Beam conditioner for free electron lasers and synchrotrons

    DOE Patents [OSTI]

    Liu, Hongxiu (Williamsburg, VA); Neil, George R. (Williamsburg, VA)

    1998-01-01

    A focused optical is been used to introduce an optical pulse, or electromagnetic wave, colinearly with the electron beam in a free electron laser or synchrotron thereby adding an axial field component that accelerates the electrons on the radial outside of the distribution of electrons in the electron beam. This invention consists of using the axial electrical component of a TEM.sub.10 mode Gaussian beam in vacuum to condition the electron beam and speed up the outer electrons in the beam. The conditioning beam should possess about the same diameter as the electron beam. The beam waist of the conditioning wave must be located around the entrance of the undulator longitudinally to have a net energy exchange between the electrons in the outer part of the distribution and the conditioning wave owing to the natural divergence of a Gaussian beam. By accelerating the outer electrons, the outer and core electrons are caused to stay in phase. This increases the fraction of the electron beam energy that is converted to light thereby improving the efficiency of conversion of energy to light and therefore boosting the power output of the free electron laser and synchrotron.

  6. Beam conditioner for free electron lasers and synchrotrons

    DOE Patents [OSTI]

    Liu, H.; Neil, G.R.

    1998-09-08

    A focused optical has been used to introduce an optical pulse, or electromagnetic wave, collinear with the electron beam in a free electron laser or synchrotron thereby adding an axial field component that accelerates the electrons on the radial outside of the distribution of electrons in the electron beam. This invention consists of using the axial electrical component of a TEM{sub 10} mode Gaussian beam in vacuum to condition the electron beam and speed up the outer electrons in the beam. The conditioning beam should possess about the same diameter as the electron beam. The beam waist of the conditioning wave must be located around the entrance of the undulator longitudinally to have a net energy exchange between the electrons in the outer part of the distribution and the conditioning wave owing to the natural divergence of a Gaussian beam. By accelerating the outer electrons, the outer and core electrons are caused to stay in phase. This increases the fraction of the electron beam energy that is converted to light thereby improving the efficiency of conversion of energy to light and therefore boosting the power output of the free electron laser and synchrotron. 4 figs.

  7. The European XFEL Free Electron Laser at DESY

    ScienceCinema (OSTI)

    Weise, Hans [Deutsches Elektronen-Synchrotron, Germany

    2009-09-01

    The European X-ray Free-Electron laser Facility (XFEL) is going to be built in an international collaboration at the Deutsches Elektronen-Synchrotron (DESY), Germany, and the Technical Design Report was published in 2006. The official project is expected for summer 2007. This new facility will offer photon beams at wavelengths as short as 1 angstrom with highest peak brilliance being more than 100 million times higher than present day synchrotron radiation sources. The radiation has a high degree of transverse coherence and the pulse duration is reduced from {approx}100 picoseconds (typ. for SR light sources) down to the {approx}10 femtosecond time domain. The overall layout of the XFEL will be described. This includes the envisaged operation parameters for the linear accelerator using superconducting TESLA technology. The complete design is based on the actually operated FLASH free-electron laser at DESY. Experience with the operation during first long user runs at wavelengths from 30 to 13 nm will be described in detail.

  8. Nonlinear model for thermal effects in free-electron lasers

    SciTech Connect (OSTI)

    Peter, E. Endler, A. Rizzato, F. B.

    2014-11-15

    In the present work, we extend results of a previous paper [Peter et al., Phys. Plasmas 20, 12?3104 (2013)] and develop a semi-analytical model to account for thermal effects on the nonlinear dynamics of the electron beam in free-electron lasers. We relax the condition of a cold electron beam but still use the concept of compressibility, now associated with a warm beam model, to evaluate the time scale for saturation and the peak laser intensity in high-gain regimes. Although vanishing compressibilites and the associated divergent densities are absent in warm models, a series of discontinuities in the electron density precede the saturation process. We show that full wave-particle simulations agree well with the predictions of the model.

  9. Operational Radiation Protection in Synchrotron Light and Free Electron Laser Facilities

    SciTech Connect (OSTI)

    Liu, James C.; Rokni, Sayed H.; /SLAC; Vylet, Vaclav; /Jefferson Lab

    2009-12-11

    The 3rd generation synchrotron radiation (SR) facilities are storage ring based facilities with many insertion devices and photon beamlines, and have low injection beam power (< few tens of watts), but extremely high stored beam power ({approx} 1 GW). The 4th generation x-ray free electron laser (FEL) facilities are based on an electron Linac with a long undulator and have high injection beam power (a few kW). Due to its electron and photon beam characteristics and modes of operation, storage ring and photon beamlines have unique safety aspects, which are the main subjects of this paper. The shielding design limits, operational modes, and beam losses are first reviewed. Shielding analysis (source terms and methodologies) and interlocked safety systems for storage ring and photon beamlines (including SR and gas bremsstrahlung) are described. Specific safety issues for storage ring top-off injection operation and FEL facilities are discussed. The operational safety program, e.g., operation authorization, commissioning, training, and radiation measurements, for SR facilities is also presented.

  10. Investigation of the electron trajectories and gain regimes of the whistler pumped free-electron laser

    SciTech Connect (OSTI)

    Jafarinia, F.; Jafari, S. [Department of Physics, University of Guilan, Rasht 41335-1914 (Iran, Islamic Republic of); Mehdian, H. [Department of Physics and Institute for Plasma Research, Tarbiat Moallem University, Tehran 15614 (Iran, Islamic Republic of)

    2013-04-15

    A free-electron laser (FEL) scheme, which employs the whistler wave as a slow electromagnetic wave wiggler, was studied theoretically. Subjected to the transverse fields of whistler wave wiggler, the beam electrons are the source of the energy needed to produce electromagnetic radiation. The strength and the period of the wiggler field depend on the parameters of the magnetoplasma medium. This configuration has a higher tunability by controlling the plasma density, on top of the {gamma}-tunability of the conventional FELs. The theory of linear gain and electron trajectories was presented and four groups (I, II, III, and IV) of electron orbits were found in the presence of an axial guide magnetic field. Using perturbation analysis, it is found that these groups of orbits were stable except small regions of group I and IV orbits. The function {Phi} which determines the rate of change of axial velocity with beam energy was also derived. In the case in which {Phi}<0 represents a negative-mass regime in which the axial velocity accelerates as the electrons lose energy. Numerical solutions showed that by increasing the cyclotron frequency, the gain for group I and III orbits increased, while a gain decrement was obtained for group II and IV orbits.

  11. An Efficient Microwave Power Source: Free-electron Laser Afterburner

    E-Print Network [OSTI]

    Wang, C.

    2008-01-01

    Proceedings of Intense Microwave Pulses (SPIE, Los Angeles,Physics An Efficient Microwave Power Source: Free-Electron4 UC-414 An Efficient Microwave Power Source: Free-electron

  12. A compact x-ray free electron laser

    SciTech Connect (OSTI)

    Barletta, W.A. . Center for Advanced Accelerators Physics Lawrence Livermore National Lab., CA ); Atac, M.; Cline, D.B.; Kolonko, J. . Center for Advanced Accelerators Physics); Bhowmik, A.; Bobbs, B.; Cover, R.A.; Dixon, F.P.; Rakowsky, G. . Rocketdyne Div.); Gallardo

    1988-01-01

    We present a design concept and simulation of the performance of a compact x-ray, free electron laser driven by ultra-high gradient rf-linacs. The accelerator design is based on recent advances in high gradient technology by a LLNL/SLAC/LBL collaboration and on the development of bright, high current electron sources by BNL and LANL. The GeV electron beams generated with such accelerators can be converted to soft x-rays in the range from 2--10 nm by passage through short period, high field strength wigglers as are being designed at Rocketdyne Linear light sources of this type can produce trains of picosecond (or shorter) pulses of extremely high spectral brilliance suitablee for flash holography of biological specimens in vivo and for studies of fast chemical reactions. 12 refs., 8 figs., 4 tabs.

  13. following an electron bunch for free electron laser

    SciTech Connect (OSTI)

    2012-01-01

    A video artist's ultra-slow-motion impression of an APEX-style electron gun firing a continuous train of electron bunches into a superconducting linear accelerator (in reality this would happen a million times a second). As they approach the speed of light the bunches contract, maintaining beam quality. After acceleration, the electron bunches are diverted into one or more undulators, the key components of free electron lasers. Oscillating back and forth in the changing magnetic field, they create beams of structured x-ray pulses. Before entering the experimental areas the electron bunches are diverted to a beam dump. (Animation created by Illumina Visual, http://www.illuminavisual.com/, for Lawrence Berkeley National Laboratory. Music for this excerpt, "Feeling Dark (Behind The Mask)" is by 7OOP3D http://ccmixter.org/files/7OOP3D/29126 and is licensed under a Creative Commons license: http://creativecommons.org/licenses/by-nc/3.0/)

  14. Thermal effect on prebunched two-beam free electron laser

    SciTech Connect (OSTI)

    Mirian, N. S.; Maraghechi, B.

    2013-08-15

    A numerical simulation in one-dimension is conducted to study the two-beam free electron laser. The fundamental resonance of the fast electron beam coincides with the fifth harmonic of the slow electron beam in order to generate extreme ultraviolet radiation. Thermal effect in the form of the longitudinal velocity spread is included in the analysis. In order to reduce the length of the wiggler, prebunched slow electron beam is considered. The evaluation of the radiation power, bunching parameter, distribution function of energy, and the distribution function of the pondermotive phase is studied. Sensitivity of the power of the fifth harmonic to the jitter in the energy difference between the two beams is also studied. A phase space is presented that shows the trapped electrons at the saturation point.

  15. A wide bandwidth free-electron laser with mode locking using current modulation.

    SciTech Connect (OSTI)

    Kur, E.; Dunning, D. J.; McNeil, B. W. J.; Wurtele, J.; Zholents, A. A. )

    2011-01-20

    A new scheme for mode locking a free-electron laser amplifier is proposed based on electron beam current modulation. It is found that certain properties of the original concept, based on the energy modulation of electrons, are improved including the spectral brightness of the source and the purity of the series of short pulses. Numerical comparisons are made between the new and old schemes and between a mode-locked free-electron laser and self-amplified spontaneous emission free-electron laser. Illustrative examples using a hypothetical mode-locked free-electron laser amplifier are provided. The ability to generate intense coherent radiation with a large bandwidth is demonstrated.

  16. Free Electron Laser Program Program at TJNAF| U.S. DOE Office...

    Office of Science (SC) Website

    Free Electron Laser Program Program at TJNAF Nuclear Physics (NP) NP Home About Research Facilities Science Highlights Benefits of NP Applications of Nuclear Science Applications...

  17. Wavefront Analysis of Nonlinear Self-Amplified Spontaneous-Emission Free-Electron Laser Harmonics in the Single-Shot Regime

    SciTech Connect (OSTI)

    Bachelard, R.; Chubar, O.; Mercere, P.; Idir, M.; Couprie, M.E.; Lambert, G.; Zeitoun, Ph.; Kimura, H.; Ohashi, H.; Higashiya, A.; Yabashi, M.; Nagasono, M.; Hara, T. and Ishikawa, T.

    2011-06-08

    The single-shot spatial characteristics of the vacuum ultraviolet self-amplified spontaneous emission of a free electron laser (FEL) is measured at different stages of amplification up to saturation with a Hartmann wavefront sensor. We show that the fundamental radiation at 61.5 nm tends towards a single-mode behavior as getting closer to saturation. The measurements are found in good agreement with simulations and theory. A near diffraction limited wavefront was measured. The analysis of Fresnel diffraction through the Hartmann wavefront sensor hole array also provides some further insight for the evaluation of the FEL transverse coherence, of high importance for various applications.

  18. Mode couplings in a two-stream free-electron laser with a helical wiggler and an ion-channel guiding

    SciTech Connect (OSTI)

    Mohsenpour, Taghi Alirezaee, Hajar

    2014-08-15

    In this study, the method of perturbation has been applied to obtain the dispersion relation (DR) of a two-stream free-electron laser (FEL) with a helical wiggler and an ion-channel with all relativistic effects on waves. This DR has been solved numerically to find the unstable modes and their growth rate. Numerical solutions of DR show that the growth rate is considerably enhanced in comparison with single-stream free-electron laser. In group II orbits, with relatively large wiggler induced velocities, new couplings are found. The effect of the velocity difference of the two electron beams on the instabilities has also been investigated in this study. Moreover, the effect of the ion-channel density on the maximum growth rate of FEL resonance has been analyzed.

  19. Study of beam loading and its compensation in the Compact Ultrafast Terahertz Free-Electron Laser injector linac

    SciTech Connect (OSTI)

    Lal, Shankar Pant, K. K.

    2014-12-15

    The RF properties of an accelerating structure, and the pulse structure and charge per bunch in the electron beam propagating through it are important parameters that determine the impact of beam loading in the structure. The injector linac of the Compact Ultrafast Terahertz Free-Electron Laser (CUTE-FEL) has been operated with two different pulse structures during initial commissioning experiments and the effect of beam loading on the accelerated electron beam parameters has been studied analytically for these two pulse structures. This paper discusses the analytical study of beam loading in a Standing Wave, Plane Wave Transformer linac employed in the CUTE-FEL setup, and a possible technique for its compensation for the electron beam parameters of the CUTE-FEL. A parametric study has been performed to study beam loading for different beam currents and to optimize injection time of the electron beam to compensate beam loading. Results from the parametric study have also been used to explain previously observed results from acceleration experiments in the CUTE-FEL setup.

  20. A Plasma Channel Beam Conditioner for a Free Electron Laser

    E-Print Network [OSTI]

    Penn, G.; Sessler, A.M.; Wurtele, J.S.

    2008-01-01

    Nature 445, 6741 (2007). [7] LCLS Design Study Group, SLACLinac Coherent Light Source (LCLS) [7]. One example has thefunction in the FEL. For LCLS parameters, the corresponding

  1. A camera for coherent diffractive imaging and holography with a soft-X-ray free electron laser

    SciTech Connect (OSTI)

    Bajt, S; Chapman, H N; Spiller, E; Alameda, J; Woods, B; Frank, M; Bogan, M J; Barty, A; Boutet, S; Marchesini, S; Hau-Riege, S P; Hajdu, J; Shapiro, D

    2007-09-24

    We describe a camera to record coherent scattering patterns with a soft-X-ray free-electron laser. The camera consists of a laterally-graded multilayer mirror which reflects the diffraction pattern onto a CCD detector. The mirror acts as a bandpass filter both for wavelength and angle, which isolates the desired scattering pattern from non-sample scattering or incoherent emission from the sample. The mirror also solves the particular problem of the extreme intensity of the FEL pulses, which are focused to greater than 10{sup 14} W/cm{sup 2}. The strong undiffracted pulse passes through a hole in the mirror and propagates on to a beam dump at a distance behind the instrument rather than interacting with a beamstop placed near the CCD. The camera concept is extendable for the full range of the fundamental wavelength of the FLASH FEL (i.e. between 6 nm and 60 nm) and into the water window. We have fabricated and tested various multilayer mirrors for wavelengths of 32 nm, 16 nm, 13.5 nm, and 4.5 nm. At the shorter wavelengths mirror roughness must be minimized to reduce scattering from the mirror. We have recorded over 30,000 diffraction patterns at the FLASH free-electron laser with no observable mirror damage or degradation of performance.

  2. A Free-Electron Laser in the Pulsar Magnetosphere

    E-Print Network [OSTI]

    Kuijpers, P K F J

    2004-01-01

    We have studied systematically the free-electron laser in the context of high brightness pulsar radio emission. In this paper, we have numerically examined the case where a transverse electromagnetic wave is distorting the motion of a relativistic electron beam while travelling over one stellar radius ($ approx 10 :{km}$). For different sets of parameters, coherent emission is generated by bunches of beam electrons in the radio domain, with bandwidths of 3 GHz. Pulse power often reached $10^{13} :{W}$, which corresponds with brightness temperature of $10^{30} :{K}$. The duration of these pulses is of the order of nanoseconds. In the context of pulsar radio emission, our results indicate that the laser can produce elementary bursts of radiation which build up the observed microstructures of a few tens of microseconds duration. The process is sensitive mostly to the beam particles energy, number density and the background magnetic field, but much less so to the transverse wave parameters. We demonstrate that th...

  3. Pulsed laser deposition with a high average power free electron laser: Benefits of subpicosecond pulses with high repetition rate

    E-Print Network [OSTI]

    Reilly, Anne

    Pulsed laser deposition with a high average power free electron laser: Benefits of subpicosecond 2002 We have conducted experiments exploring pulsed laser deposition of thin films using the high average power Thomas Jefferson National Accelerator Facility Free Electron Laser. The combination

  4. Efficiency enhancement of a harmonic lasing free-electron laser

    SciTech Connect (OSTI)

    Salehi, E.; Maraghechi, B.; Mirian, N. S.

    2015-03-15

    The harmonic lasing free-electron laser amplifier, in which two wigglers is employed in order for the fundamental resonance of the second wiggler to coincide with the third harmonic of the first wiggler to generate ultraviolet radiation, is studied. A set of coupled nonlinear first-order differential equations describing the nonlinear evolution of the system, for a long electron bunch, is solved numerically by CYRUS code. Solutions for the non-averaged and averaged equations are compared. Remarkable agreement is found between the averaged and non-averaged simulations for the evolution of the third harmonic. Thermal effects in the form of longitudinal velocity spread are also investigated. For efficiency enhancement, the second wiggler field is set to decrease linearly and nonlinearly at the point where the radiation of the third harmonic saturates. The optimum starting point and the slope of the tapering of the amplitude of the wiggler are found by a successive run of the code. It is found that tapering can increase the saturated power of the third harmonic considerably. In order to reduce the length of the wiggler, the prebunched electron beam is considered.

  5. A PLASMA CHANNEL BEAM CONDITIONER FOR A FREE ELECTRON LASER

    E-Print Network [OSTI]

    Wurtele, Jonathan

    . In this paper, we give examples of conditioners that might be employed at the Linac Coherent Light Source (LCLS is the output wavelength, and is the average beta function in the FEL. For LCLS parameters, the corresponding

  6. Performance of the accelerator driver of Jefferson Laboratory's free-electron laser

    SciTech Connect (OSTI)

    Bohn, C.L.; Benson, S.; Biallas, G.

    1999-04-01

    The driver of Jefferson Lab's kW-level infrared free-electron laser (FEL) is a superconducting, recirculating accelerator that recovers about 75% of the electron-beam power and converts it to radiofrequency power. In achieving first lasing, the accelerator operated straight-ahead to deliver 38 MeV, 1.1 mA cw current through the wiggler for lasing at wavelengths in the vicinity of 5 {mu}m. Just prior to first lasing, measured rms beam properties at the wiggler were 7.5{+-}1.5 mm-mr normalized transverse emittance, 26{+-}7 keV-deg longitudinal emittance, and 0.4{+-}0.1 ps bunch length which yielded a peak current of 60{+-}15A. The waste beam was then sent directly to a dump, bypassing the recirculation loop. Stable operation at up to 311 W cw was achieved in this mode. Commissioning the recirculation loop then proceeded. As of this Conference, the machine has recirculated cw average current up to 4 mA, and has lased cw with energy recover up to 710 W.

  7. The effect of shot noise on the start up of the fundamental and harmonics in free-electron lasers

    SciTech Connect (OSTI)

    Freund, H. P.; Miner, W. H. Jr.; Giannessi, L.

    2008-12-15

    The problem of radiation start up in free-electron lasers (FELs) is important in the simulation of virtually all FEL configurations including oscillators and amplifiers in both seeded master oscillator power amplifier (MOPA) and self-amplified spontaneous emission (SASE) modes. Both oscillators and SASE FELs start up from spontaneous emission due to shot noise on the electron beam, which arises from the random fluctuations in the phase distribution of the electrons. The injected power in a MOPA is usually large enough to overwhelm the shot noise. However, this noise must be treated correctly in order to model the initial start up of the harmonics. In this paper, we discuss and compare two different shot noise models that are implemented in both one-dimensional wiggler-averaged (PERSEO) and non-wiggler-averaged (MEDUSA1D) simulation codes, and a three-dimensional non-wiggler-averaged (MEDUSA) formulation. These models are compared for examples describing both SASE and MOPA configurations in one dimension, in steady-state, and time-dependent simulations. Remarkable agreement is found between PERSEO and MEDUSA1D for the evolution of the fundamental and harmonics. In addition, three-dimensional correction factors have been included in the MEDUSA1D and PERSEO, which show reasonable agreement with MEDUSA for a sample MOPA in steady-state and time-dependent simulations.

  8. A Single-Shot Method for Measuring Femtosecond Bunch Length in Linac-Based Free-Electron Lasers

    SciTech Connect (OSTI)

    Huang, Z.; Bane, K.; Ding, Y.; Emma, P.; /SLAC

    2010-08-26

    There is growing interest in the generation and characterization of femtosecond and subfemtosecond pulses from linac-based free-electron lasers (FELs). In this report, following the method of Ricci and Smith [Phys. Rev. ST Accel. Beams 3, 032801 (2000)], we investigate the measurement of the longitudinal bunch profile of an ultrashort electron bunch produced by these FELs. We show that this method can be applied in a straightforward manner at x-ray FEL facilities such as the Linac Coherent Light Source by slightly adjusting the second bunch compressor followed by running the bunch on an rf zero-crossing phase of the final linac. We find that the linac wakefield strongly perturbs the measurement, and through analysis show that it can be compensated in a simple way. We demonstrate the effectiveness of this method and wakefield compensation through numerical simulations, including effects of coherent synchrotron radiation and longitudinal space charge. When used in conjunction with a high-resolution electron spectrometer, this method potentially reveals the temporal profile of the electron beam down to the femtosecond and subfemotsecond scale.

  9. Instability of wave modes in a two-stream free-electron laser with a helical wiggler and an axial magnetic field

    SciTech Connect (OSTI)

    Mohsenpour, Taghi; Mehrabi, Narges [Department of Physics, Faculty of Basic Sciences, University of Mazandaran, Babolsar (Iran, Islamic Republic of)] [Department of Physics, Faculty of Basic Sciences, University of Mazandaran, Babolsar (Iran, Islamic Republic of)

    2013-08-15

    The dispersion relation of a two-stream free-electron laser (TSFEL) with a one-dimensional helical wiggler and an axial magnetic field is studied. Also, all relativistic effects on the space-charge wave and radiation are considered. This dispersion relation is solved numerically to find the unstable interaction among the all wave modes. Numerical calculations show that the growth rate is considerably enhanced in comparison with single-stream FEL. The effect of the velocity difference of the two electron beams on the two-stream instability and the FEL resonance is investigated. The maximum growth rate of FEL resonance is investigated numerically as a function of the axial magnetic field.

  10. Femtosecond all-optical synchronization of an X-ray free-electron laser

    DOE Public Access Gateway for Energy & Science Beta (PAGES Beta)

    Schulz, S.; Grguraš, I.; Behrens, C.; Bromberger, H.; Costello, J. T.; Czwalinna, M. K.; Felber, M.; Hoffmann, M. C.; Ilchen, M.; Liu, H. Y.; et al

    2015-01-20

    Many advanced applications of X-ray free-electron lasers require pulse durations and time resolutions of only a few femtoseconds. To generate these pulses and to apply them in time-resolved experiments, synchronization techniques that can simultaneously lock all independent components, including all accelerator modules and all external optical lasers, to better than the delivered free-electron laser pulse duration, are needed. Here we achieve all-optical synchronization at the soft X-ray free-electron laser FLASH and demonstrate facility-wide timing to better than 30 fs r.m.s. for 90 fs X-ray photon pulses. Crucially, our analysis indicates that the performance of this optical synchronization is limited primarilymore »by the free-electron laser pulse duration, and should naturally scale to the sub-10 femtosecond level with shorter X-ray pulses.« less

  11. FIRST LASING AT 32 NM OF THE VUV-FEL AT DESY S. Schreiber

    E-Print Network [OSTI]

    FIRST LASING AT 32 NM OF THE VUV-FEL AT DESY S. Schreiber , DESY, Hamburg, Germany for the VUV-FEL team Abstract The VUV-FEL is a free electron laser user facility being commissioned at DESY. It is based on the TTF-FEL, which was in operation until end of 2002 providing a photon beam for two pilot

  12. THE INJECTOR OF THE VUV-FEL AT DESY S. Schreiber

    E-Print Network [OSTI]

    THE INJECTOR OF THE VUV-FEL AT DESY S. Schreiber , DESY, Hamburg, Germany for the VUV-FEL team Abstract The VUV-FEL is a free electron laser user facility be- ing commissioned at DESY in Hamburg, and diagnostic sections. The good performance of the injector was crucial for the first lasing of the VUV-FEL

  13. Eigenmode analysis of a high-gain free-electron laser based on...

    Office of Scientific and Technical Information (OSTI)

    Eigenmode analysis of a high-gain free-electron laser based on a transverse gradient undulator Citation Details In-Document Search Title: Eigenmode analysis of a high-gain...

  14. THE SYSTEM OF POWER SUPPLIES, CONTROL AND MODULATION OF ELECTRON GUN FOR FREE ELECTRON LASER

    E-Print Network [OSTI]

    Kozak, Victor R.

    THE SYSTEM OF POWER SUPPLIES, CONTROL AND MODULATION OF ELECTRON GUN FOR FREE ELECTRON LASER E of the system. Proceedings of RUPAC2012, Saint|-|Petersburg, Russia TUPPB050 Ion sources and electron guns ISBN

  15. A CW normal-conductive RF gun for free electron laser and energy recovery linac applications

    E-Print Network [OSTI]

    Baptiste, Kenneth

    2009-01-01

    Todd, State-of-the art electron guns and injector de- signs,7] Summary of working group on guns and injectors, 41st Ad-A CW normal-conductive RF gun for free electron laser and

  16. Jefferson Lab's Free-Electron Laser Joins With Others in New...

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

    Free-Electron Laser Joins With Others in New Research Venture NEWPORT NEWS, VA, April 29, 2009 - The U.S. Department of Energy's Thomas Jefferson National Accelerator Facility will...

  17. Bendable Focusing X-Ray Optics for the ALS and the LCLS/FEL: Design, Metrology, and Performance

    E-Print Network [OSTI]

    Yashchuk, V. V.

    2010-01-01

    Optics for the ALS and the LCLS/FEL: Design, Metrology, andwas performed in support of the AMO/LCLS project at SLAC. *Coherent Light Source (LCLS) x-ray free electron laser (FEL)

  18. IMPROVED OPERATION OF THE TTF PHOTOINJECTOR FOR FEL S. Schreiber

    E-Print Network [OSTI]

    IMPROVED OPERATION OF THE TTF PHOTOINJECTOR FOR FEL OPERATION S. Schreiber , J.-P. Carneiro, Ch. Abstract The RF gun based photoinjector of the TTF Free Elec- tron Laser (TTF-FEL) at DESY has been various experiments for the TESLA project, the photoinjector is used to drive the TTF- FEL free electron

  19. CHARACTERIZATION OF ORBITAL ANGULAR MOMENTUM MODES IN FEL RADIATION

    E-Print Network [OSTI]

    Brookhaven National Laboratory

    CHARACTERIZATION OF ORBITAL ANGULAR MOMENTUM MODES IN FEL RADIATION E. Hemsing , G. Andonian, J singularity on axis. Here we discuss current efforts to characterize the mode content of the VISA FEL through are discussed. INTRODUCTION Free-electron lasers (FELs) have long been used as tun- able sources of coherent

  20. X-ray-optical cross-correlator for gas-phase experiments at the Linac Coherent Light Source free-electron laser

    SciTech Connect (OSTI)

    Schorb, S.; Cryan, J. P.; Glownia, J. M.; Bionta, M. R.; Coffee, R. N.; Swiggers, M.; Carron, S.; Castagna, J.-C.; Bozek, J. D.; Messerschmidt, M.; Schlotter, W. F.; Bostedt, C. [Linac Coherent Light Source, SLAC National Accelerator Laboratory, P.O. Box 20450, Stanford, California 94309 (United States); Gorkhover, T. [Institut fuer Optik und Atomare Physik, Technische Universitaet Berlin, Hardenbergstr. 36, 10623 Berlin (Germany); Erk, B.; Boll, R.; Schmidt, C.; Rudenko, A. [Max-Planck Advanced-Study-Group at CFEL, Notkestr. 85, 22607 Hamburg (Germany); Max-Planck-Institut f. Kernphysik, Saupfercheckweg 1, 69117 Heidelberg (Germany); Rolles, D. [Max-Planck Advanced-Study-Group at CFEL, Notkestr. 85, 22607 Hamburg (Germany); Max-Planck-Institut f. med. Forschung, Jahnstr. 29, 69120 Heidelberg (Germany); Rouzee, A. [Max-Born-Institut, Max-Born-Str. 2, 12489 Berlin (Germany)

    2012-03-19

    X-ray-optical pump-probe experiments at the Linac Coherent Light Source (LCLS) have so far been limited to a time resolution of 280 fs fwhm due to timing jitter between the accelerator-based free-electron laser (FEL) and optical lasers. We have implemented a single-shot cross-correlator for femtosecond x-ray and infrared pulses. A reference experiment relying only on the pulse arrival time information from the cross-correlator shows a time resolution better than 50 fs fwhm (22 fs rms) and also yields a direct measurement of the maximal x-ray pulse length. The improved time resolution enables ultrafast pump-probe experiments with x-ray pulses from LCLS and other FEL sources.

  1. Femtosecond resolution timing jitter correction on a TW scale Ti:sapphire laser system for FEL pump-probe experiments

    E-Print Network [OSTI]

    Divall, Marta Csatari; Divall, Edwin J; Hauri, Christoph P

    2015-01-01

    Intense ultrashort pulse lasers are used for fs resolution pumpprobe experiments more and more at large scale facilities, such as free electron lasers (FEL). Measurement of the arrival time of the laser pulses and stabilization to the machine or other sub-systems on the target, is crucial for high time-resolution measurements. In this work we report on a single shot, spectrally resolved, non-collinear cross-correlator with sub-fs resolution. With a feedback applied we keep the output of the TW class Ti:sapphire amplifier chain in time with the seed oscillator to ~3 fs RMS level for several hours. This is well below the typical pulse duration used at FELs and supports fs resolution pump-probe experiments. Short term jitter and long term timing drift measurements are presented. Applicability to other wavelengths and integration into the timing infrastructure of the FEL are also covered to show the full potential of the device.

  2. Study of beam transverse properties of a thermionic electron gun for application to a compact THz free electron laser

    SciTech Connect (OSTI)

    Hu, Tongning E-mail: yjpei@ustc.edu.cn; Qin, Bin; Tan, Ping; Chen, Qushan; Yang, Lei; Pei, Yuanji E-mail: yjpei@ustc.edu.cn; Li, Ji

    2014-10-15

    A novel thermionic electron gun adopted for use in a high power THz free electron laser (FEL) is proposed in this paper. By optimization of the structural and radiofrequency (RF) parameters, the physical design of the gun is performed using dynamic calculations. Velocity bunching is used to minimize the bunch's energy spread, and the dynamic calculation results indicate that high quality beams can be provided. The transverse properties of the beams generated by the gun are also analyzed. The novel RF focusing effects of the resonance cavity are investigated precisely and are used to establish emittance compensation, which enables the injector length to be reduced. In addition, the causes of the extrema of the beam radius and the normalized transverse emittance are analyzed and interpreted, respectively, and slice simulations are performed to illustrate how the RF focusing varies along the bunch length and to determine the effects of that variation on the emittance compensation. Finally, by observation of the variations of the beam properties in the drift tube behind the electron gun, prospective assembly scenarios for the complete THz-FEL injector are discussed, and a joint-debugging process for the injector is implemented.

  3. Density gradient free electron collisionally excited x-ray laser

    DOE Patents [OSTI]

    Campbell, E.M.; Rosen, M.D.

    1984-11-29

    An operational x-ray laser is provided that amplifies 3p-3s transition x-ray radiation along an approximately linear path. The x-ray laser is driven by a high power optical laser. The driving line focused optical laser beam illuminates a free-standing thin foil that may be associated with a substrate for improved structural integrity. This illumination produces a generally cylindrically shaped plasma having an essentially uniform electron density and temperature, that exists over a long period of time, and provides the x-ray laser gain medium. The x-ray laser may be driven by more than one optical laser beam. The x-ray laser has been successfully demonstrated to function in a series of experimental tests.

  4. Density gradient free electron collisionally excited X-ray laser

    DOE Patents [OSTI]

    Campbell, Edward M. (Pleasanton, CA); Rosen, Mordecai D. (Berkeley, CA)

    1989-01-01

    An operational X-ray laser (30) is provided that amplifies 3p-3s transition X-ray radiation along an approximately linear path. The X-ray laser (30) is driven by a high power optical laser. The driving line focused optical laser beam (32) illuminates a free-standing thin foil (34) that may be associated with a substrate (36) for improved structural integrity. This illumination produces a generally cylindrically shaped plasma having an essentially uniform electron density and temperature, that exists over a long period of time, and provides the X-ray laser gain medium. The X-ray laser (30) may be driven by more than one optical laser beam (32, 44). The X-ray laser (30) has been successfully demonstrated to function in a series of experimental tests.

  5. Navy Breaks World Record With Futuristic Free-Electron Laser...

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

    foxnews.comscitech20110218navy-breaks-world-record-futuristic-laser-getting-real Submitted: Sunday, February 20, 2011...

  6. Beam Line Design and Beam Physics Study of Energy Recovery Linac Free Electron Laser at Peking University

    SciTech Connect (OSTI)

    Guimei Wang

    2011-12-31

    Energy recovering linac (ERL) offers an attractive alternative for generating intense beams of charged particles by approaching the operational efficiency of a storage ring while maintaining the superior beam quality typical of a linear accelerator. In ERLs, the decelerated beam cancels the beam loading effects of the accelerated beam with high repetition rate. Therefore, ERLs can, in principle, accelerate very high average currents with only modest amounts of RF power. So the efficiency of RF power to beam is much higher. Furthermore, the energy of beam to dump is lower, so it will reduce dump radiation. With the successful experiments in large maximum-to-injection energy ratio up to 51:1 and high power FEL up to 14kW, the use of ERL, especially combining with superconducting RF technology, provides a potentially powerful new paradigm for generation of the charged particle beams used in MW FEL, synchrotron radiation sources, high-energy electron cooling devices and so on. The 3+1/2 DC-SC photo injector and two 9cell TESLA superconducting cavity for IR SASE FEL in PKU provides a good platform to achieve high average FEL with Energy Recovery. The work of this thesis is on Beam line design and Beam dynamics study of Energy Recovery Linac Free Electron Laser for Peking University. It is the upgrade of PKU facility, which is under construction. With ERL, this facility can work in CW mode, so it can operate high average beam current without RF power constraint in main linac and generate high average FEL power. Moreover, it provides a test facility to study the key technology in ERL. System parameters are optimized for PKU ERL-FEL. The oscillation FEL output power is studied with different bunch charge, transverse emittance, bunch length and energy spread. The theory of optimal RF power and Q{sub ext} with ERL and without ERL is analyzed and applied to PKU injector and linac including microphonic effect. pace charge effect in the injector and merger is studied for beam energy at ~5MeV. Simulation shows that in the 3+1/2 DC- C injector, there is a region the beam could be over focused by RF electromagnetic field and the transverse emittance in the transport line up to linac will increase instantly due to over focusing. In order to eliminate this effect on beam emittance, several solutions are investigated to avoid over focusing. This result is very important for beam loading experiment for low bunch charge operation. Meanwhile, different merger structures are compared in terms of error sensitivity and emittance increase with space charge effect. In recirculation beam line, a new symmetric 180{degree} arc structure is designed. It fulfills the achromatic condition and adjustable bunch compression. These two parameters are controlled by different Quads knob. With this novel structure, the recirculation lattice can achieve path length adjustment, bunch compression and decompression in a large range. With beamline error, the beam central orbit will deviate from the designed trajectory. An orbit correction system is optimized, which balances between cost and performance of orbit after correction at design level. Different methods are used to estimate its robustness. The BBU instability, especially multi-pass BBU imposed a potentially severe limitation to the average current that can be accelerated in an ERL. Simulation gives the harmful HOMs and predicts that the threshold average current in this machine is much higher than the possible operation current. This work is based on the existing facility in PKU, so it provides guidelines for the facility operation and upgrade in the future. The theoretical analysis of ERL requirement and FEL requirement on beam transport line and beam property paves the way for future ERL research.

  7. Photon Statistics of a Free-Electron Laser 

    E-Print Network [OSTI]

    Becker, W.; Zubairy, M. Suhail

    1982-01-01

    High-order above-threshold ionization by few-cycle laser pulses is analyzed in terms of quantum orbits. For a given carrier-envelope phase, the number of contributing orbits and their ionization and rescattering times ...

  8. The First Angstrom X-Ray Free-Electron Laser

    SciTech Connect (OSTI)

    Galayda, John; /SLAC

    2012-08-24

    The Linac Coherent Light Source produced its first x-ray laser beam on 10 April 2009. Today it is routinely producing x-ray pulses with energy >2 mJ across the operating range from 820-8,200 eV. The facility has begun operating for atomic/molecular/optical science experiments. Performance of the facility in its first user run (1 October - 21 December) and current machine development activities will be presented. Early results from the preparations for the start of the second user run is also reported.

  9. ANALYTIC MODEL OF HARMONIC GENERATION IN THE LOW-GAIN FEL REGIME

    E-Print Network [OSTI]

    Wurtele, Jonathan

    ANALYTIC MODEL OF HARMONIC GENERATION IN THE LOW-GAIN FEL REGIME G. Penn, M. Reinsch, J.S. Wurtele , LBNL, Berkeley, CA 94720, USA Abstract Harmonic generation using free electron lasers (FELs) requires with simulation results using the FEL code GENESIS, both for single stages of harmonic generation and for the LUX

  10. Wakefield Induced Correlated Energy Spread and Emittance Growth at TTF FEL

    E-Print Network [OSTI]

    1 Wakefield Induced Correlated Energy Spread and Emittance Growth at TTF FEL Feng ZHOU DESY) at DESY. During FEL operations, the longitudinal and transverse wakefields which are generated by vacuum and emittance growth at the TTF FEL of phase I and II. 1 Introduction The Free Electron Laser at the TESLA Test

  11. THE INTEGRAL EQUATION FOR A HIGH GAIN FEL N. A. Vinokurov *

    E-Print Network [OSTI]

    Kemner, Ken

    1 THE INTEGRAL EQUATION FOR A HIGH GAIN FEL N. A. Vinokurov * Introduction The theory of a high gain free electron laser (FEL) is now well developed (e.g., see [1]). In this paper I derive the equation for the electron distribution function, which is valid for FELs with a longitudinally

  12. TESLA-FEL 2004-02 The Potential for the Development of the

    E-Print Network [OSTI]

    TESLA-FEL 2004-02 The Potential for the Development of the X-Ray Free Electron Laser E.L. Saldin, E Abstract X-ray photon beam from a SASE FEL undulator is in principle a single user tool, just like the SASE FEL with three undulators which have different period and tunable gap. All electrons

  13. TRANSVERSE ELECTRON BEAM DIAGNOSTICS AT THE VUV-FEL AT K. Honkavaara

    E-Print Network [OSTI]

    TRANSVERSE ELECTRON BEAM DIAGNOSTICS AT THE VUV-FEL AT DESY K. Honkavaara , F. L¨oehl, Hamburg. Catani, A. Cianchi, INFN-Roma2, 00133 Roma, Italy Abstract The VUV-FEL is a new free electron laser user tools and methods. At the VUV-FEL the transverse distribution of the electron beam is measured using

  14. Characterization and Suppression of the Electromagnetic Interference Induced Phase Shift in the JLab FEL Photo - Injector Advanced Drive Laser System

    SciTech Connect (OSTI)

    F. G. Wilson, D. Sexton, S. Zhang

    2011-09-01

    The drive laser for the photo-cathode gun used in the JLab Free Electron Laser (FEL) facility had been experiencing various phase shifts on the order of tens of degrees (>20{sup o} at 1497 MHz or >40ps) when changing the Advanced Drive Laser (ADL) [2][3][4] micro-pulse frequencies. These phase shifts introduced multiple complications when trying to setup the accelerator for operation, ultimately inhibiting the robustness and overall performance of the FEL. Through rigorous phase measurements and systematic characterizations, we determined that the phase shifts could be attributed to electromagnetic interference (EMI) coupling into the ADL phase control loop, and subsequently resolved the issue of phase shift to within tenths of a degree (<0.5{sup o} at 1497 MHz or <1ps). The diagnostic method developed and the knowledge gained through the entire process will prove to be invaluable for future designs of similar systems.

  15. Dispersion relation and growth rate in a Cherenkov free electron laser: Finite axial magnetic field

    SciTech Connect (OSTI)

    Kheiri, Golshad; Esmaeilzadeh, Mahdi

    2013-12-15

    A theoretical analysis is presented for dispersion relation and growth rate in a Cherenkov free electron laser with finite axial magnetic field. It is shown that the growth rate and the resonance frequency of Cherenkov free electron laser increase with increasing axial magnetic field for low axial magnetic fields, while for high axial magnetic fields, they go to a saturation value. The growth rate and resonance frequency saturation values are exactly the same as those for infinite axial magnetic field approximation. The effects of electron beam self-fields on growth rate are investigated, and it is shown that the growth rate decreases in the presence of self-fields. It is found that there is an optimum value for electron beam density and Lorentz relativistic factor at which the maximum growth rate can take place. Also, the effects of velocity spread of electron beam are studied and it is found that the growth rate decreases due to the electron velocity spread.

  16. Chorus wave amplification: A free electron laser in the Earth's magnetosphere

    SciTech Connect (OSTI)

    Soto-Chavez, A. R.; Bhattacharjee, A.; Ng, C. S.

    2012-01-15

    A new theoretical model for whistler-mode chorus amplification in the Earth's magnetosphere is presented. We derive, based on the free-electron laser mechanism in a high-gain amplifier, a new closed set of self-consistent relativistic equations that couple the Hamiltonian equations for particles with Maxwell's equations. We demonstrate that these equations predict, through a cubic equation, whistler amplification levels in good agreement with those observed in the Earth's magnetosphere.

  17. High harmonic attosecond pulse train amplification in a free electron laser

    SciTech Connect (OSTI)

    McNeil, B.W.; Sheehy, B.; Thompson, N.R.; Dunning, D.J.

    2011-03-04

    It is shown using three-dimensional simulations that the temporal structure of an attosecond pulse train, such as that generated via high harmonic generation in noble gases, may be retained in a free electron laser amplifier through to saturation using a mode-locked optical klystron configuration. At wavelengths of {approx}12 nm, a train of attosecond pulses of widths {approx}300 as with peak powers in excess of 1 GW are predicted.

  18. International Congeress on Plasma Physics, Nice, France, 25-29 October 2004 Chaotic particle dynamics in free-electron lasers with coaxial wiggler

    E-Print Network [OSTI]

    Boyer, Edmond

    University of Arak, Arak, Iran The motion of a relativistic test electron in a free-electron laser dynamics in free-electron lasers with coaxial wiggler B. Farokhi and S. Mobarakabadi Islamic Azad orbits. Earlier investigations of chaos in free ­ electron lasers have focused on chaotic behavior

  19. Macroparticle Theory of a Standing Wave Free-Electron Laser Two-Beam Accelerator

    E-Print Network [OSTI]

    Takayama, K.

    2008-01-01

    those in a multi-stage klystron- like FEL (or a multi-stagestability in a multistage klystron-like FEL, the stability

  20. Design of an XUV FEL Driven by the Laser-Plasma Accelerator at the LBNL LOASIS Facility

    E-Print Network [OSTI]

    Schroeder, Carl B.; Fawley, W.M.; Esarey, Eric; Leemans, W.P.

    2006-01-01

    Table 2 shows the expected FEL performance employing a 31-nmDESIGN OF AN XUV FEL DRIVEN BY THE LASER-PLASMA ACCELERATORa design for a compact FEL source of ultra- fast, high-

  1. The Standing Wave FEL/TBA: Realistic Cavity Geometry and Energy Extraction

    E-Print Network [OSTI]

    Kim, J.S.

    2008-01-01

    in the Proceedings The Standing Wave FEL/TBA: Realistic33257 CBP-225 UC-414 The Standing Wave FELfTBA: Realisticand M.A. Makowski "Standing -wave free-electron laser two-

  2. Mixing and space-charge effects in free-electron lasers

    SciTech Connect (OSTI)

    Peter, E.; Endler, A.; Rizzato, F. B.; Serbeto, A.

    2013-12-15

    The present work revisits the subjects of mixing, saturation, and space-charge effects in free-electron lasers. Use is made of the compressibility factor, which proves to be a helpful tool in the related systems of charged beams confined by static magnetic fields. The compressibility allows to perform analytical estimates of the elapsed time until the onset of mixing, which in turn allows to estimate the saturated amplitude of the radiation field. In addition, the compressibility helps to pinpoint space-charge effects and the corresponding transition from Compton to Raman regimes.

  3. High-intensity double-pulse X-ray free-electron laser

    DOE Public Access Gateway for Energy & Science Beta (PAGES Beta)

    Marinelli, A.; Ratner, D.; Lutman, A. A.; Turner, J.; Welch, J.; Decker, F. J.; Loos, H.; Behrens, C.; Gilevich, S.; Miahnahri, A. A.; et al

    2015-03-06

    The X-ray free-electron laser has opened a new era for photon science, improving the X-ray brightness by ten orders of magnitude over previously available sources. Similar to an optical laser, the spectral and temporal structure of the radiation pulses can be tailored to the specific needs of many experiments by accurately manipulating the lasing medium, that is, the electron beam. Here we report the generation of mJ-level two-colour hard X-ray pulses of few femtoseconds duration with an XFEL driven by twin electron bunches at the Linac Coherent Light Source. This performance represents an improvement of over an order of magnitudemore »in peak power over state-of-the-art two-colour XFELs. The unprecedented intensity and temporal coherence of this new two-colour X-ray free-electron laser enable an entirely new set of scientific applications, ranging from X-ray pump/X-ray probe experiments to the imaging of complex biological samples with multiple wavelength anomalous dispersion.« less

  4. Strongly aligned gas-phase molecules at Free-Electron Lasers

    E-Print Network [OSTI]

    Kierspel, Thomas; Mullins, Terry; Robinson, Joseph; Aquila, Andy; Barty, Anton; Bean, Richard; Boll, Rebecca; Boutet, Sébastien; Bucksbaum, Philip; Chapman, Henry N; Christensen, Lauge; Fry, Alan; Hunter, Mark; Koglin, Jason E; Liang, Mengning; Mariani, Valerio; Morgan, Andrew; Natan, Adi; Petrovic, Vladimir; Rolles, Daniel; Rudenko, Artem; Schnorr, Kirsten; Stapelfeldt, Henrik; Stern, Stephan; Thøgersen, Jan; Yoon, Chun Hong; Wang, Fenglin; Trippel, Sebastian; Küpper, Jochen

    2015-01-01

    We demonstrate a novel experimental implementation to strongly align molecules at full repetition rates of free-electron lasers. We utilized the available in-house laser system at the coherent x-ray imaging beamline at the Linac Coherent Light Source. Chirped laser pulses, i. e., the direct output from the regenerative amplifier of the Ti:Sa chirped pulse amplification laser system, were used to strongly align 2,5-diiodothiophene molecules in a molecular beam. The alignment laser pulses had pulse energies of a few mJ and a pulse duration of 94 ps. A degree of alignment of $\\left$ = 0.85 was measured, limited by the intrinsic temperature of the molecular beam rather than by the available laser system. With the general availability of synchronized chirped-pulse-amplified near-infrared laser systems at short-wavelength laser facilities, our approach allows for the universal preparation of molecules tightly fixed in space for experiments with x-ray pulses.

  5. A revised partiality model and post-refinement algorithm for X-ray free-electron laser data

    DOE Public Access Gateway for Energy & Science Beta (PAGES Beta)

    Ginn, Helen Mary; Brewster, Aaron S.; Hattne, Johan; Evans, Gwyndaf; Wagner, Armin; Grimes, Jonathan M.; Sauter, Nicholas K.; Sutton, Geoff; Stuart, David Ian

    2015-05-23

    Research towards using X-ray free-electron laser (XFEL) data to solve structures using experimental phasing methods such as sulfur single-wavelength anomalous dispersion (SAD) has been hampered by shortcomings in the diffraction models for X-ray diffraction from FELs. Owing to errors in the orientation matrix and overly simple partiality models, researchers have required large numbers of images to converge to reliable estimates for the structure-factor amplitudes, which may not be feasible for all biological systems. Here, data for cytoplasmic polyhedrosis virus type 17 (CPV17) collected at 1.3 Å wavelength at the Linac Coherent Light Source (LCLS) are revisited. A previously published definitionmore »of a partiality model for reflections illuminated by self-amplified spontaneous emission (SASE) pulses is built upon, which defines a fraction between 0 and 1 based on the intersection of a reflection with a spread of Ewald spheres modelled by a super-Gaussian wavelength distribution in the X-ray beam. A method of post-refinement to refine the parameters of this model is suggested. This has generated a merged data set with an overall discrepancy (by calculating theRsplitvalue) of 3.15% to 1.46 Å resolution from a 7225-image data set. The atomic numbers of C, N and O atoms in the structure are distinguishable in the electron-density map. There are 13 S atoms within the 237 residues of CPV17, excluding the initial disordered methionine. These only possess 0.42 anomalous scattering electrons each at 1.3 Å wavelength, but the 12 that have single predominant positions are easily detectable in the anomalous difference Fourier map. It is hoped that these improvements will lead towards XFEL experimental phase determination and structure determination by sulfur SAD and will generally increase the utility of the method for difficult cases.« less

  6. Direct and secondary nuclear excitation with x-ray free-electron lasers

    E-Print Network [OSTI]

    Gunst, Jonas; Kumar, Naveen; Keitel, Christoph H; Pálffy, Adriana

    2015-01-01

    The direct and secondary nuclear excitation produced by an x-ray free electron laser when interacting with a solid-state nuclear target is investigated theoretically. When driven at the resonance energy, the x-ray free electron laser can produce direct photoexcitation. However, the dominant process in that interaction is the photoelectric effect producing a cold and very dense plasma in which also secondary processes such as nuclear excitation by electron capture may occur. We develop a realistic model to quantify the temporal dynamics of the plasma and the magnitude of the secondary excitation therein. Numerical results show that depending on the nuclear transition energy and the temperature and charge states reached in the plasma, secondary nuclear excitation by electron capture may dominate the direct photoexcitation by several orders of magnitude, as it is the case for the 4.8 keV transition from the isomeric state of $^{93}$Mo, or it can be negligible, as it is the case for the 14.4 keV M\\"ossbauer trans...

  7. LUNEX5: A FRENCH FEL TEST FACILITY LIGHT SOURCE PROPOSAL A. Loulergue, C. Benabderrahmane, M. Bessire, P. Betinelli, F. Bouvet, A. Buteau, L. Cassinari,

    E-Print Network [OSTI]

    Boyer, Edmond

    LUNEX5: A FRENCH FEL TEST FACILITY LIGHT SOURCE PROPOSAL A. Loulergue, C. Benabderrahmane, M is a new Free Electron Laser (FEL) source project aimed at delivering short and coherent X-ray pulses seeded FEL operations aiming at producing higher coherence and energetic X-rays for the pilot user

  8. Experimental demonstration of longitudinal beam phase space linearizer in a free-electron laser facility by corrugated structures

    E-Print Network [OSTI]

    Deng, Haixiao; Feng, Chao; Zhang, Tong; Wang, Xingtao; Lan, Taihe; Feng, Lie; Zhang, Wenyan; Liu, Xiaoqing; Yao, Haifeng; Shen, Lei; Li, Bin; Zhang, Junqiang; Li, Xuan; Fang, Wencheng; Wang, Dan; Couprie, Marie-emmanuelle; Lin, Guoqiang; Liu, Bo; Gu, Qiang; Wang, Dong; Zhao, Zhentang

    2014-01-01

    Removal of residual linear energy chirp and intrinsic nonlinear energy curvature in the relativistic electron beam from radiofrequency linear accelerator is of paramount importance for efficient lasing of a high-gain free-electron laser. Recently, it was theoretically and experimentally demonstrated that the longitudinal wakefield excited by the electrons itself in the corrugated structure allows for precise control of the electron beam phase space. In this Letter, we report the first utilization of a corrugated structure as beam linearizer in the operation of a seeded free-electron laser driven by a 140 MeV linear accelerator, where a gain of ~10,000 over spontaneous emission was achieved at the second harmonic of the 1047 nm seed laser, and a free-electron laser bandwidth narrowing by about 50% was observed, in good agreement with the theoretical expectations.

  9. Covariance mapping of two-photon double core hole states in C 2 H 2 and C 2 H 6 produced by an x-ray free electron laser

    DOE Public Access Gateway for Energy & Science Beta (PAGES Beta)

    Mucke, M; Zhaunerchyk, V; Frasinski, L J; Squibb, R J; Siano, M; Eland, J H D; Linusson, P; Salén, P; Meulen, P v d; Thomas, R D; et al

    2015-07-01

    Few-photon ionization and relaxation processes in acetylene (C2H2) and ethane (C2H6) were investigated at the linac coherent light source x-ray free electron laser (FEL) at SLAC, Stanford using a highly efficient multi-particle correlation spectroscopy technique based on a magnetic bottle. The analysis method of covariance mapping has been applied and enhanced, allowing us to identify electron pairs associated with double core hole (DCH) production and competing multiple ionization processes including Auger decay sequences. The experimental technique and the analysis procedure are discussed in the light of earlier investigations of DCH studies carried out at the same FEL and at thirdmore »generation synchrotron radiation sources. In particular, we demonstrate the capability of the covariance mapping technique to disentangle the formation of molecular DCH states which is barely feasible with conventional electron spectroscopy methods.« less

  10. Reconstructing Three-dimensional Helical Structure With an X-Ray Free Electron Laser

    E-Print Network [OSTI]

    M. Uddin

    2015-06-29

    Recovery of three-dimensional structure from single particle X-ray scattering of completely randomly oriented diffraction patterns as predicted few decades back has been real due to advent of the new emerging X-ray Free Electron Laser (XFEL) technology. As the world's first XFEL is in operation starting from June 2009 at SLAC National Lab at Stanford, the very first few experiments being conducted on larger objects such as viruses. Many of the important structures of nature such as helical viruses or deoxyribonucleic acids (DNA) consist of helical repetition of biological subunits. Hence development of method for reconstructing helical structure from collected XFEL data has been a top priority research. In this work we have developed a method for solving helical structure such as TMV from a set of randomly oriented simulated diffraction patterns exploiting symmetry and Fourier space constraint of the diffraction volume.

  11. Spectrometer for Hard X-Ray Free Electron Laser Based on Diffraction Focusing

    E-Print Network [OSTI]

    Kohn, V G; Vartanyants, I A

    2012-01-01

    X-ray free electron lasers (XFELs) generate sequences of ultra-short, spatially coherent pulses of x-ray radiation. We propose the diffraction focusing spectrometer (DFS), which is able to measure the whole energy spectrum of the radiation of a single XFEL pulse with an energy resolution of $\\Delta E/E\\approx 2\\times 10^{-6}$. This is much better than for most modern x-ray spectrometers. Such resolution allows one to resolve the fine spectral structure of the XFEL pulse. The effect of diffraction focusing occurs in a single crystal plate due to dynamical scattering, and is similar to focusing in a Pendry lens made from the metamaterial with a negative refraction index. Such a spectrometer is easier to operate than those based on bent crystals. We show that the DFS can be used in a wide energy range from 5 keV to 20 keV.

  12. Applications of free electron lasers and synchrotrons in industry and research

    SciTech Connect (OSTI)

    Barletta, William A. [Dept. of Physics, Massachusetts Institute of Technology Cambridge MA (United States)

    2013-04-19

    Synchrotron radiation sources have had a profound effect on both science and technology from their beginnings decades ago as parasitic operations on accelerators for high energy physics. Now the general area of photon science has opened up new experimental techniques which have become the mainstay tools of materials science, surface physics, protein crystallography, and nanotechnology. With the promise of ultra-bright beams from the latest generation of storage rings and free electron lasers with full coherence, the tools of photon science promise to open a new area of mesoscale science and technology as well as prove to be a disruptive wildcard in the search for sustainable energy technologies. This review will survey a range of applications and explore in greater depth the potential applications to EUV lithography and to technologies for solar energy.

  13. Spatial and temporal coherence properties of single free-electron laser pulses

    E-Print Network [OSTI]

    Singer, A; Mancuso, A P; Gerasimova, N; Yefanov, O M; Gulden, J; Gorniak, T; Senkbeil, T; Sakdinawat, A; Liu, Y; Attwood, D; Dziarzhytski, S; Mai, D D; Treusch, R; Weckert, E; Salditt, T; Rosenhahn, A; Wurth, W; Vartanyants, I A

    2015-01-01

    The experimental characterization of the spatial and temporal coherence properties of the free-electron laser in Hamburg (FLASH) at a wavelength of 8.0 nm is presented. Double pinhole diffraction patterns of single femtosecond pulses focused to a size of about 10 microns by 10 microns were measured. A transverse coherence length of 6.2 microns in the horizontal and 8.7 microns in the vertical direction was determined from the most coherent pulses. Using a split and delay unit the coherence time of the pulses produced in the same operation conditions of FLASH was measured to be 1.75 fs. From our experiment we estimated the degeneracy parameter of the FLASH beam to be on the order of $10^{10}$ to $10^{11}$, which exceeds the values of this parameter at any other source in the same energy range by many orders of magnitude.

  14. Ultrafast myoglobin structural dynamics observed with an X-ray free-electron laser

    DOE Public Access Gateway for Energy & Science Beta (PAGES Beta)

    Levantino, Matteo; Schirò, Giorgio; Lemke, Henrik Till; Cottone, Grazia; Glownia, James Michael; Zhu, Diling; Chollet, Mathieu; Ihee, Hyotcherl; KAIST, Daejeon; Cupane, Antonio; et al

    2015-04-02

    Light absorption can trigger biologically relevant protein conformational changes. The light induced structural rearrangement at the level of a photoexcited chromophore is known to occur in the femtosecond timescale and is expected to propagate through the protein as a quake-like intramolecular motion. Here we report direct experimental evidence of such ‘proteinquake’ observed in myoglobin through femtosecond X-ray solution scattering measurements performed at the Linac Coherent Light Source X-ray free-electron laser. An ultrafast increase of myoglobin radius of gyration occurs within 1 picosecond and is followed by a delayed protein expansion. As the system approaches equilibrium it undergoes damped oscillations withmore »a ~3.6-picosecond time period. Our results unambiguously show how initially localized chemical changes can propagate at the level of the global protein conformation in the picosecond timescale.« less

  15. Reconstructing Three-dimensional Helical Structure With an X-Ray Free Electron Laser

    E-Print Network [OSTI]

    M. Uddin

    2015-11-21

    Recovery of three-dimensional structure from single particle X-ray scattering of completely randomly oriented diffraction patterns as predicted few decades back has been real due to the advent of the new emerging X-ray Free Electron Laser (XFEL) technology. As the worlds first XFEL is in operation starting from June 2009 at SLAC National Lab at Stanford, the very first few experiments being conducted on larger objects such as viruses. Many of the important structures of nature such as helical viruses or deoxyribonucleic acids (DNA) consist of helical repetition of biological subunits. Hence development of method for reconstructing helical structure from collected XFEL data has been a top priority research. In this work we have developed a method for solving helical structure such as TMV (tobacco mosaic virus) from a set of randomly oriented simulated diffraction patterns exploiting symmetry and Fourier space constraint of the diffraction volume.

  16. Using the X-FEL to photo-pump X-ray laser transitions in He-like Ne

    SciTech Connect (OSTI)

    Nilsen, J; Rohringer, N

    2011-08-30

    Nearly four decades ago H-like and He-like resonantly photo-pumped laser schemes were proposed for producing X-ray lasers. However, demonstrating these schemes in the laboratory has proved to be elusive because of the difficulty of finding a strong resonant pump line. With the advent of the X-ray free electron laser (X-FEL) at the SLAC Linac Coherent Light Source (LCLS) we now have a tunable X-ray laser source that can be used to replace the pump line in previously proposed laser schemes and allow researchers to study the physics and feasibility of resonantly photo-pumped laser schemes. In this paper we use the X-FEL at 1174 eV to photo-pump the singly excited 1s2p state of He-like Ne to the doubly excited 2p3p state and model gain on the 2p3p-2p2s transition at 175 eV and the 2p3p-1s3p transition at 1017 eV. One motivation for studying this scheme is to explore possible quenching of the gain due to strong non-linear coupling effects from the intense X-FEL beam We compare this scheme with photo-pumping the He-like Ne ground state to the 1s3p singly excited state followed by lasing on the 3p-2s and 3d-2p transitions at 158 and 151 eV. Experiments are being planned at LCLS to study these laser processes and coherent quantum effects.

  17. Standing-Wave Free-Electron Laser Two-Beam Accelerator

    E-Print Network [OSTI]

    Sessler, Andrew M.

    2008-01-01

    RK configurations: (1) the method of extraction of microwaveseptum-couplers. Other extraction methods have been studiedwave FEL/TBA. The method of extraction is " beat-coupling"

  18. On the possible void decay in free-electron laser sase-fel experiment

    E-Print Network [OSTI]

    J Marciak-Kozlowska; M Pelc; M Kozlowski

    2007-05-21

    In this paper the motion of ultrahigh energy particles produced in sasefel is investigated. The critical field which opose the acceleration of the ultra high energy particles is calculated

  19. Femtosecond x-ray absorption spectroscopy with hard x-ray free electron laser

    SciTech Connect (OSTI)

    Katayama, Tetsuo; Togashi, Tadashi; Tono, Kensuke; Kameshima, Takashi; Inubushi, Yuichi; Sato, Takahiro; Hatsui, Takaki; Yabashi, Makina; Obara, Yuki; Misawa, Kazuhiko; Bhattacharya, Atanu; Kurahashi, Naoya; Ogi, Yoshihiro; Suzuki, Toshinori; Molecular Reaction Dynamics Research Team, RIKEN Center for Advanced Photonics, 2-1 Hirosawa, Wako 351-0198

    2013-09-23

    We have developed a method of dispersive x-ray absorption spectroscopy with a hard x-ray free electron laser (XFEL), generated by a self-amplified spontaneous emission (SASE) mechanism. A transmission grating was utilized for splitting SASE-XFEL light, which has a relatively large bandwidth (?E/E ? 5 × 10{sup ?3}), into several branches. Two primary split beams were introduced into a dispersive spectrometer for measuring signal and reference spectra simultaneously. After normalization, we obtained a Zn K-edge absorption spectrum with a photon-energy range of 210 eV, which is in excellent agreement with that measured by a conventional wavelength-scanning method. From the analysis of the difference spectra, the noise ratio was evaluated to be ?3 × 10{sup ?3}, which is sufficiently small to trace minute changes in transient spectra induced by an ultrafast optical laser. This scheme enables us to perform single-shot, high-accuracy x-ray absorption spectroscopy with femtosecond time resolution.

  20. Soft x-ray free-electron laser induced damage to inorganic scintillators

    DOE Public Access Gateway for Energy & Science Beta (PAGES Beta)

    Burian, Tomáš; Hájková, V?ra; Chalupský, Jaromír; Vyšín, Lud?k; Bohá?ek, Pavel; P?e?ek, Martin; Wild, Jan; Özkan, Cigdem; Coppola, Nicola; Farahani, Shafagh Dastjani; et al

    2015-01-07

    An irreversible response of inorganic scintillators to intense soft x-ray laser radiation was investigated at the FLASH (Free-electron LASer in Hamburg) facility. Three ionic crystals, namely, Ce:YAG (cerium-doped yttrium aluminum garnet), PbWO4 (lead tungstate), and ZnO (zinc oxide), were exposed to single 4.6 nm ultra-short laser pulses of variable pulse energy (up to 12 ?J) under normal incidence conditions with tight focus. Damaged areas produced with various levels of pulse fluences, were analyzed on the surface of irradiated samples using differential interference contrast (DIC) and atomic force microscopy (AFM). The effective beam area of 22.2 ± 2.2 ?m2 was determinedmore »by means of the ablation imprints method with the use of poly(methyl methacrylate) - PMMA. Applied to the three inorganic materials, this procedure gave almost the same values of an effective area. The single-shot damage threshold fluence was determined for each of these inorganic materials. The Ce:YAG sample seems to be the most radiation resistant under the given irradiation conditions, its damage threshold was determined to be as high as 660.8 ± 71.2 mJ/cm2. Contrary to that, the PbWO4 sample exhibited the lowest radiation resistance with a threshold fluence of 62.6 ± 11.9 mJ/cm2. The threshold for ZnO was found to be 167.8 ± 30.8 mJ/cm2. Both interaction and material characteristics responsible for the damage threshold difference are discussed in the article.« less

  1. Coherence Properties of Individual Femtosecond Pulses of an X-ray Free-Electron Laser

    SciTech Connect (OSTI)

    Vartanyants, I.A.; /DESY /Moscow Phys. Eng. Inst.; Singer, A.; Mancuso, A.P.; Yefanov, O.M.; /DESY; Sakdinawat, A.; Liu, Y.; Bang, E.; /UC, Berkeley; Williams, G.J.; /SLAC; Cadenazzi, G.; Abbey, B.; /Melbourne U.; Sinn, H.; /European XFEL, Hamburg; Attwood, D.; /UC, Berkeley; Nugent, K.A.; /Melbourne U.; Weckert, E.; /DESY; Wang, T.; Zhu, D.; Wu, B.; Graves, C.; Scherz, A.; Turner, J.J.; Schlotter, W.F.; /SLAC /LERMA, Ivry /Zurich, ETH /LBL, Berkeley /ANL, APS /Argonne /SLAC /LLNL, Livermore /Latrobe U. /SLAC /SLAC /European XFEL, Hamburg /SLAC /Hamburg U.

    2012-06-06

    Measurements of the spatial and temporal coherence of single, femtosecond x-ray pulses generated by the first hard x-ray free-electron laser, the Linac Coherent Light Source, are presented. Single-shot measurements were performed at 780 eV x-ray photon energy using apertures containing double pinholes in 'diffract-and-destroy' mode. We determined a coherence length of 17 {micro}m in the vertical direction, which is approximately the size of the focused Linac Coherent Light Source beam in the same direction. The analysis of the diffraction patterns produced by the pinholes with the largest separation yields an estimate of the temporal coherence time of 0.55 fs. We find that the total degree of transverse coherence is 56% and that the x-ray pulses are adequately described by two transverse coherent modes in each direction. This leads us to the conclusion that 78% of the total power is contained in the dominant mode.

  2. Three-dimensional simulation of efficiency enhancement in free-electron laser with prebunched electron beam

    SciTech Connect (OSTI)

    Chitsazi, Mahboobeh; Maraghechi, B.; Rouhani, M. H.

    2010-10-15

    The effect of prebunching of the electron beam and tapering of the wiggler amplitude on the harmonic upconversion in free-electron laser amplifier is studied in three dimensions. A set of coupled nonlinear first-order differential equations that describe the three-dimensional simulation of the system is solved numerically. This set of equation describes self-consistently the longitudinal spatial dependence of radiation waists, curvatures, and amplitudes together with the evaluation of the electron beam. The analysis is related to extreme ultraviolet and x-ray emission. In addition to uniform beam, prebunched electron beam has also been studied. The effect of sinusoidal distribution of entry times for the electron beam on the evolution of radiation is compared with uniform distribution. It is shown that prebunching reduces the saturation length substantially. For efficiency enhancement, the wiggler is set to decrease linearly when the radiation of the third harmonic saturates. The optimum starting point and the slope of tapering of the amplitude of the wiggler are found by a successive run of the code. It was found that tapering can increase the saturated power of the third harmonic considerably.

  3. VISA: A Milestone on the Path towards X-Ray Free Electron Lasers...

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

    and saturation regime. Both, simulation and theory predict the intensity of the 3rd harmonic to be about 1% of the fundamental for an x-ray SASE FEL. This is about 8 orders of...

  4. Microstructure-based laser-driven free-electron laser T. Plettner , R.L. Byer

    E-Print Network [OSTI]

    Byer, Robert L.

    Keywords: Dielectric-structure undulator Laser-driven particle acceleration Phase-synchronous deflection with future structure-loaded laser-driven particle accelerators. These accelerators are expected to operate-tabletop system that is based on this accelerator, a matching compact undulator is highly desirable. To this end

  5. Optical Klystron Enhancement to SASE X-ray FELs

    SciTech Connect (OSTI)

    Ding, Yuantao; Emma, Paul; Huang, Zhirong; Kumar, Vinit

    2006-04-07

    The optical klystron enhancement to self-amplified spontaneous emission (SASE) free electron lasers (FELs) is studied in theory and in simulations. In contrast to a seeded FEL, the optical klystron gain in a SASE FEL is not sensitive to any phase mismatch between the radiation and the microbunched electron beam. The FEL performance with the addition of four optical klystrons located at the undulator long breaks in the Linac Coherent Light Source (LCLS) shows significant improvement if the uncorrelated energy spread at the undulator entrance can be controlled to a very small level. In addition, FEL saturation at shorter x-ray wavelengths (around 1.0 A) within the LCLS undulator length becomes possible. We also discuss the application of the optical klystron in a compact x-ray FEL design that employs relatively low electron beam energy together with a shorter-period undulator.

  6. Frequency shifting in free-electron lasers G. Shvets and J. S. Wurtele

    E-Print Network [OSTI]

    Wurtele, Jonathan

    in current and energy produce shifts in the detuning from FEL resonance and in the beam-wave coupling. We and Department of Physics, Massachusetts Institute of Technology, Cambridge, Massachusetts 02139 (Received 6 May in a microwave amplifier with time-dependent beam energy and current are derived and found to be in good

  7. BUDKER INP FREE ELECTRON LASER FACILITY CURRENT STATUS AND FUTURE PROSPECTS *

    E-Print Network [OSTI]

    Kozak, Victor R.

    of scientists including biologists, chemists and physicists. Its high peak and average powers are utilized possible options for the future upgrade. ACCELERATOR DESIGN The Novosibirsk FEL facility is based at the ceiling. At the common track there are two round magnets. By switching these magnets on and off one can

  8. SEMINARI FEL: Aula Grassano alle ore 14:30 Martedi' 13 Gennaio : Introduzione alla teoria del laser ad elettroni liberi.

    E-Print Network [OSTI]

    Morante, Silvia

    SEMINARI FEL: Aula Grassano alle ore 14:30 Martedi' 13 Gennaio : Introduzione alla teoria del laser particelle/radiazione nei FEL con il codice di simulazione Perseo. Saranno presentati alcuni esempi pratici Ricerca ENEA di Frascati che è lo sviluppatore di uno dei codici di simulazione per i FEL (Perseo) e

  9. Focus characterization at an X-ray free-electron laser by coherent scattering and speckle analysis

    DOE Public Access Gateway for Energy & Science Beta (PAGES Beta)

    Sikorski, Marcin; Song, Sanghoon; Schropp, Andreas; Deutsches Elektronen-Synchrotron, Hamburg; Seiboth, Frank; Feng, Yiping; Alonso-Mori, Roberto; Chollet, Matthieu; Lemke, Henrik T.; Sokaras, Dimosthenis; et al

    2015-04-14

    X-ray focus optimization and characterization based on coherent scattering and quantitative speckle size measurements was demonstrated at the Linac Coherent Light Source. Its performance as a single-pulse free-electron laser beam diagnostic was tested for two typical focusing configurations. The results derived from the speckle size/shape analysis show the effectiveness of this technique in finding the focus' location, size and shape. In addition, its single-pulse compatibility enables users to capture pulse-to-pulse fluctuations in focus properties compared with other techniques that require scanning and averaging.

  10. Performance study of a soft X-ray harmonic generation FEL seeded with an EUV laser pulse

    E-Print Network [OSTI]

    Wurtele, Jonathan

    Performance study of a soft X-ray harmonic generation FEL seeded with an EUV laser pulse M. Gullans electron laser (FEL) using a low-power extreme ultraviolet (EUV) pulse as an input seed is investigated. The parameters are appropriate for 30 nm seeds produced from high-power Ti:Sapphire pulses using high harmonic

  11. FEL Polarization Control Studies on Dalian Coherent Light Source

    E-Print Network [OSTI]

    Zhang, Tong; Zhang, Wei-Qing; Wu, Guo-Rong; Dai, Dong-Xu; Wang, Dong; Yang, Xue-Ming; Zhao, Zhen-Tang

    2013-01-01

    The polarization switch of a free-electron laser (FEL) is of great importance to the user scientific community. In this paper, we investigate the generation of controllable polarization FEL from two well-known approaches for Dalian coherent light source, i.e., crossed planar undulator and elliptical permanent undulator. In order to perform a fair comparative study, a one-dimensional time-dependent FEL code has been developed, in which the imperfection effects of an elliptical permanent undulator are taken into account. Comprehensive simulation results indicate that the residual beam energy chirp and the intrinsic FEL gain may contribute to the degradation of the polarization performance for the crossed planar undulator. And the elliptical permanent undulator is not very sensitive to the undulator errors and beam imperfections. Meanwhile, with proper configurations of the main planar undulators and additional elliptical permanent undulator section, circular polarized FEL with pulse energy exceeds 100 $\\mu$J co...

  12. Longitudinally Coherent Single-Spike Radiation from a Self-Amplified Spontaneous Emission Free-Electron Laser

    E-Print Network [OSTI]

    Marcus, Gabriel Andrew

    2012-01-01

    light at saturation for the LCLS FEL case with a 4.5 GeV e-light at saturation for the LCLS FEL case with a 4.5 GeV e-along the undulator for the LCLS FEL case with a 4.5 GeV e-

  13. Performance study of a soft X-ray harmonic generation FEL seeded with an EUV laser pulse

    E-Print Network [OSTI]

    Gullans, M.; Wurtele, J.S.; Penn, G.; Zholents, A.A.

    2007-01-01

    FEL Seeded with an EUV Laser Pulse M. Gullans, J.S. Wurtele,seeded with an EUV laser pulse M. Gullans a , J.S. Wurtele bpower extreme ultraviolet (EUV) pulse as an input seed is

  14. Electron bunch energy and phase feed-forward stabilization system for the Mark V RF-linac free-electron laser

    SciTech Connect (OSTI)

    Hadmack, M. R.; Kowalczyk, J. M. D.; Lienert, B. R.; Madey, J. M. J.; Szarmes, E. B. [Department of Physics and Astronomy, University of Hawai'i at Manoa, Honolulu, Hawaii 96822 (United States); Jacobson, B. T. [RadiaBeam Technologies, Santa Monica, California 90404 (United States)

    2013-06-15

    An amplitude and phase compensation system has been developed and tested at the University of Hawai'i for the optimization of the RF drive system to the Mark V free-electron laser. Temporal uniformity of the RF drive is essential to the generation of an electron beam suitable for optimal free-electron laser performance and the operation of an inverse Compton scattering x-ray source. The design of the RF measurement and compensation system is described in detail and the results of RF phase compensation are presented. Performance of the free-electron laser was evaluated by comparing the measured effects of phase compensation with the results of a computer simulation. Finally, preliminary results are presented for the effects of amplitude compensation on the performance of the complete system.

  15. Focus characterization at an X-ray free-electron laser by coherent...

    Office of Scientific and Technical Information (OSTI)

    laser beam diagnostic was tested for two typical focusing configurations. The results derived from the speckle sizeshape analysis show the effectiveness of this technique in...

  16. The Turn-on of LCLS: the X-Ray Free Electron Laser at SLAC ( Keynote - 2011 JGI User Meeting)

    ScienceCinema (OSTI)

    Drell, Persis [SLAC Director

    2011-06-08

    The U.S. Department of Energy Joint Genome Institute (JGI) invited scientists interested in the application of genomics to bioenergy and environmental issues, as well as all current and prospective users and collaborators, to attend the annual DOE JGI Genomics of Energy & Environment Meeting held March 22-24, 2011 in Walnut Creek, Calif. The emphasis of this meeting was on the genomics of renewable energy strategies, carbon cycling, environmental gene discovery, and engineering of fuel-producing organisms. The meeting features presentations by leading scientists advancing these topics. SLAC National Laboratory Director Persis Drell gives a keynote talk on "The Turn-on of LCLS: the X-Ray Free-Electron Laser at SLAC" at the 6th Genomics of Energy & Environment Meeting on March 22, 2011

  17. The Turn-on of LCLS: the X-Ray Free Electron Laser at SLAC ( Keynote - 2011 JGI User Meeting)

    SciTech Connect (OSTI)

    Drell, Persis [SLAC Director] [SLAC Director

    2011-03-22

    The U.S. Department of Energy Joint Genome Institute (JGI) invited scientists interested in the application of genomics to bioenergy and environmental issues, as well as all current and prospective users and collaborators, to attend the annual DOE JGI Genomics of Energy & Environment Meeting held March 22-24, 2011 in Walnut Creek, Calif. The emphasis of this meeting was on the genomics of renewable energy strategies, carbon cycling, environmental gene discovery, and engineering of fuel-producing organisms. The meeting features presentations by leading scientists advancing these topics. SLAC National Laboratory Director Persis Drell gives a keynote talk on "The Turn-on of LCLS: the X-Ray Free-Electron Laser at SLAC" at the 6th Genomics of Energy & Environment Meeting on March 22, 2011

  18. Enabling X-ray free electron laser crystallography for challenging biological systems from a limited number of crystals

    DOE Public Access Gateway for Energy & Science Beta (PAGES Beta)

    Uervirojnangkoorn, Monarin; Zeldin, Oliver B.; Lyubimov, Artem Y.; Hattne, Johan; Brewster, Aaron S.; Sauter, Nicholas K.; Brunger, Axel T.; Weis, William I.

    2015-03-17

    There is considerable potential for X-ray free electron lasers (XFELs) to enable determination of macromolecular crystal structures that are difficult to solve using current synchrotron sources. Prior XFEL studies often involved the collection of thousands to millions of diffraction images, in part due to limitations of data processing methods. We implemented a data processing system based on classical post-refinement techniques, adapted to specific properties of XFEL diffraction data. When applied to XFEL data from three different proteins collected using various sample delivery systems and XFEL beam parameters, our method improved the quality of the diffraction data as well as themore »resulting refined atomic models and electron density maps. Moreover, the number of observations for a reflection necessary to assemble an accurate data set could be reduced to a few observations. These developments will help expand the applicability of XFEL crystallography to challenging biological systems, including cases where sample is limited.« less

  19. High-resolution single-shot spectral monitoring of hard x-ray free-electron laser radiation

    DOE Public Access Gateway for Energy & Science Beta (PAGES Beta)

    Makita, M.; Karvinen, P.; Zhu, D.; Juranic, P. N.; Grünert, J.; Cartier, S.; Jungmann-Smith, J. H.; Lemke, H. T.; Mozzanica, A.; Nelson, S.; et al

    2015-10-16

    We have developed an on-line spectrometer for hard x-ray free-electron laser (XFEL) radiation based on a nanostructured diamond diffraction grating and a bent crystal analyzer. Our method provides high spectral resolution, interferes negligibly with the XFEL beam, and can withstand the intense hard x-ray pulses at high repetition rates of >100 Hz. The spectrometer is capable of providing shot-to-shot spectral information for the normalization of data obtained in scientific experiments and optimization of the accelerator operation parameters. We have demonstrated these capabilities of the setup at the Linac Coherent Light Source, in self-amplified spontaneous emission mode at full energy ofmore »>1 mJ with a 120 Hz repetition rate, obtaining a resolving power of ?/?? > 3 × 104. In conclusion, the device was also used to monitor the effects of pulse duration down to 8 fs by analysis of the spectral spike width.« less

  20. Longitudinally Coherent Single-Spike Radiation from a Self-Amplified Spontaneous Emission Free-Electron Laser

    E-Print Network [OSTI]

    Marcus, Gabriel Andrew

    2012-01-01

    power supplies, electron beam diagnostics, and FEL radiationbeen reported. Electron Beam Characterization The diagnosticelectron beams. In addition, nonlinear optics, the foundation upon which all FROG diagnostics

  1. Microbunching Instability Effect Studies and Laser Heater Optimization for the SPARX FEL Accelerator

    E-Print Network [OSTI]

    Vaccarezza, C.

    2010-01-01

    OPTIMIZATION FOR THE SPARX FEL ACCELERATOR * C. Vaccarezza,and possibly enhance the FEL performance. delivered to theinstability effect for the SPARX FEL. Table 1: Electron beam

  2. NATIONAL HIGH MAGENTIC FIELD LABORATORY FEL INJECTOR DESIGN CONSIDERATION

    SciTech Connect (OSTI)

    Pavel Evtushenko; Stephen Benson; David Douglas; George Neil

    2007-06-25

    A Numerical study of beam dynamics was performed for two injector systems for the proposed National High Magnetic Field Laboratory at the Florida State University (FSU) Free Electron Laser (FEL) facility. The first considered a system consisting of a thermionic DC gun, two buncher cavities operated at 260 MHz and 1.3 GHz and two TESLA type cavities, and is very similar to the injector of the ELBE Radiation Source. The second system we studied uses a DC photogun (a copy of JLab FEL electron gun), one buncher cavity operated at 1.3 GHz and two TESLA type cavities. The study is based on PARMELA simulations and takes into account operational experience of both the JLab FEL and the Radiation Source ELBE. The simulations predict the second system will have a much smaller longitudinal emittance. For this reason the DC photo gun based injector is preferred for the proposed FSU FEL facility.

  3. Statistical properties of the radiation from SASE FEL operating in a post-saturation regime with and without undulator tapering

    E-Print Network [OSTI]

    Schneidmiller, E A

    2015-01-01

    We describe statistical and coherence properties of the radiation from x-ray free electron lasers (XFEL) operating in the post-saturation regime. We consider practical case of the SASE3 FEL at the European XFEL. We perform comparison of the main characteristics of the X-ray FEL operating in the post-saturation regime with and without undulator tapering: efficiency, coherence time and degree of transverse coherence.

  4. Bent crystal spectrometer for both frequency and wavenumber resolved x-ray scattering at a seeded free-electron laser

    SciTech Connect (OSTI)

    Zastrau, Ulf; Fletcher, Luke B.; Galtier, Eric Ch.; Gamboa, Eliseo; Glenzer, Siegfried H.; Heimann, Philipp; Nagler, Bob; Schropp, Andreas; Lee, Hae Ja; Förster, Eckhart; Marschner, Heike; Wehrhan, Ortrud

    2014-09-15

    We present a cylindrically curved GaAs x-ray spectrometer with energy resolution ?E/E = 1.1 ×?10{sup ?4} and wave-number resolution of ?k/k = 3 ×?10{sup ?3}, allowing plasmon scattering at the resolution limits of the Linac Coherent Light Source (LCLS) x-ray free-electron laser. It spans scattering wavenumbers of 3.6 to 5.2/Å in 100 separate bins, with only 0.34% wavenumber blurring. The dispersion of 0.418 eV/13.5??m agrees with predictions within 1.3%. The reflection homogeneity over the entire wavenumber range was measured and used to normalize the amplitude of scattering spectra. The proposed spectrometer is superior to a mosaic highly annealed pyrolytic graphite spectrometer when the energy resolution needs to be comparable to the LCLS seeded bandwidth of 1 eV and a significant range of wavenumbers must be covered in one exposure.

  5. Bent crystal spectrometer for both frequency and wavenumber resolved x-ray scattering at a seeded free-electron laser

    E-Print Network [OSTI]

    Zastrau, Ulf; Foerster, Eckhart; Galtier, Eric Ch; Gamboa, Eliseo; Glenzer, Siegfried H; Heimann, Philipp; Marschner, Heike; Nagler, Bob; Schropp, Andreas; Wehrhan, Ortrud; Lee, Hae Ja

    2014-01-01

    We present a cylindrically curved GaAs x-ray spectrometer with energy resolution $\\Delta E/E = 1.1\\cdot 10^{-4}$ and wave-number resolution of $\\Delta k/k = 3\\cdot 10^{-3}$, allowing plasmon scattering at the resolution limits of the Linac Coherent Light Source (LCLS) x-ray free-electron laser. It spans scattering wavenumbers of 3.6 to $5.2/$\\AA\\ in 100 separate bins, with only 0.34\\% wavenumber blurring. The dispersion of 0.418~eV/$13.5\\,\\mu$m agrees with predictions within 1.3\\%. The reflection homogeneity over the entire wavenumber range was measured and used to normalize the amplitude of scattering spectra. The proposed spectrometer is superior to a mosaic HAPG spectrometer when the energy resolution needs to be comparable to the LCLS seeded bandwidth of 1~eV and a significant range of wavenumbers must be covered in one exposure.

  6. Damage Threshold of Platinum Coating used for Optics for Self-Seeding of Soft X-ray Free Electron Laser

    SciTech Connect (OSTI)

    Krzywinski, Jacek; Cocco, Daniele; Moeller, Stefan; Ratner, Daniel

    2015-01-01

    We investigated the experimental damage threshold of platinum coating on a silicon substrate illuminated by soft x-ray radiation at grazing incidence angle of 2.1 deg. The coating was the same as the blazed grating used for the soft X-ray self-seeding optics of the Linac Coherent Light Source free electron laser. The irradiation condition was chosen such that the absorbed dose was similar to the maximum dose expected for the grating. The expected dose was simulated by solving the Helmholtz equation in non-homogenous media. The experiment was performed at 900 eV photon energy for both single pulse and multi-shot conditions. We have not observed single shot damage. This corresponds to a single shot damage threshold being higher than 3 J/cm2. The multiple shot damage threshold measured for 10 shots and about 600 shots was determined to be 0.95 J/cm2 and 0.75 J/cm2 respectively. The damage threshold occurred at an instantaneous dose which is higher that the melt dose of platinum.

  7. Structural studies of P-type ATPase–ligand complexes using an X-ray free-electron laser

    DOE Public Access Gateway for Energy & Science Beta (PAGES Beta)

    Bublitz, Maike; Nass, Karol; Drachmann, Nikolaj D.; Markvardsen, Anders J.; Gutmann, Matthias J.; Barends, Thomas R. M.; Mattle, Daniel; Shoeman, Robert L.; Doak, R. Bruce; Boutet, Sébastien; et al

    2015-06-11

    Membrane proteins are key players in biological systems, mediating signalling events and the specific transport ofe.g.ions and metabolites. Consequently, membrane proteins are targeted by a large number of currently approved drugs. Understanding their functions and molecular mechanisms is greatly dependent on structural information, not least on complexes with functionally or medically important ligands. Structure determination, however, is hampered by the difficulty of obtaining well diffracting, macroscopic crystals. Here, the feasibility of X-ray free-electron-laser-based serial femtosecond crystallography (SFX) for the structure determination of membrane protein–ligand complexes using microcrystals of various native-source and recombinant P-type ATPase complexes is demonstrated. The data revealmore »the binding sites of a variety of ligands, including lipids and inhibitors such as the hallmark P-type ATPase inhibitor orthovanadate. By analyzing the resolution dependence of ligand densities and overall model qualities, SFX data quality metrics as well as suitable refinement procedures are discussed. Even at relatively low resolution and multiplicity, the identification of ligands can be demonstrated. This makes SFX a useful tool for ligand screening and thus for unravelling the molecular mechanisms of biologically active proteins.« less

  8. Structural studies of P-type ATPase–ligand complexes using an X-ray free-electron laser

    SciTech Connect (OSTI)

    Bublitz, Maike; Nass, Karol; Drachmann, Nikolaj D.; Markvardsen, Anders J.; Gutmann, Matthias J.; Barends, Thomas R. M.; Mattle, Daniel; Shoeman, Robert L.; Doak, R. Bruce; Boutet, Sébastien; Messerschmidt, Marc; Seibert, Marvin M.; Williams, Garth J.; Foucar, Lutz; Reinhard, Linda; Sitsel, Oleg; Gregersen, Jonas L.; Clausen, Johannes D.; Boesen, Thomas; Gotfryd, Kamil; Wang, Kai -Tuo; Olesen, Claus; Møller, Jesper V.; Nissen, Poul; Schlichting, Ilme

    2015-06-11

    Membrane proteins are key players in biological systems, mediating signalling events and the specific transport ofe.g.ions and metabolites. Consequently, membrane proteins are targeted by a large number of currently approved drugs. Understanding their functions and molecular mechanisms is greatly dependent on structural information, not least on complexes with functionally or medically important ligands. Structure determination, however, is hampered by the difficulty of obtaining well diffracting, macroscopic crystals. Here, the feasibility of X-ray free-electron-laser-based serial femtosecond crystallography (SFX) for the structure determination of membrane protein–ligand complexes using microcrystals of various native-source and recombinant P-type ATPase complexes is demonstrated. The data reveal the binding sites of a variety of ligands, including lipids and inhibitors such as the hallmark P-type ATPase inhibitor orthovanadate. By analyzing the resolution dependence of ligand densities and overall model qualities, SFX data quality metrics as well as suitable refinement procedures are discussed. Even at relatively low resolution and multiplicity, the identification of ligands can be demonstrated. This makes SFX a useful tool for ligand screening and thus for unravelling the molecular mechanisms of biologically active proteins.

  9. Damage Threshold of Platinum Coating used for Optics for Self-Seeding of Soft X-ray Free Electron Laser

    DOE Public Access Gateway for Energy & Science Beta (PAGES Beta)

    Krzywinski, Jacek; Cocco, Daniele; Moeller, Stefan; Ratner, Daniel

    2015-01-01

    We investigated the experimental damage threshold of platinum coating on a silicon substrate illuminated by soft x-ray radiation at grazing incidence angle of 2.1 deg. The coating was the same as the blazed grating used for the soft X-ray self-seeding optics of the Linac Coherent Light Source free electron laser. The irradiation condition was chosen such that the absorbed dose was similar to the maximum dose expected for the grating. The expected dose was simulated by solving the Helmholtz equation in non-homogenous media. The experiment was performed at 900 eV photon energy for both single pulse and multi-shot conditions. We have not observed single shot damage. This corresponds to a single shot damage threshold being higher than 3 J/cm2. The multiple shot damage threshold measured for 10 shots and about 600 shots was determined to be 0.95 J/cm2 and 0.75 J/cm2 respectively. The damage threshold occurred at an instantaneous dose which is higher that the melt dose of platinum.

  10. Damage Threshold of Platinum Coating used for Optics for Self-Seeding of Soft X-ray Free Electron Laser

    DOE Public Access Gateway for Energy & Science Beta (PAGES Beta)

    Krzywinski, Jacek; Cocco, Daniele; Moeller, Stefan; Ratner, Daniel

    2015-02-23

    We investigated the experimental damage threshold of platinum coating on a silicon substrate illuminated by soft x-ray radiation at grazing incidence angle of 2.1 deg. The coating was the same as the blazed grating used for the soft X-ray self-seeding optics of the Linac Coherent Light Source free electron laser. The irradiation condition was chosen such that the absorbed dose was similar to the maximum dose expected for the grating. The expected dose was simulated by solving the Helmholtz equation in non-homogenous media. The experiment was performed at 900 eV photon energy for both single pulse and multi-shot conditions. Wemore »have not observed single shot damage. This corresponds to a single shot damage threshold being higher than 3 J/cm2. The multiple shot damage threshold measured for 10 shots and about 600 shots was determined to be 0.95 J/cm2 and 0.75 J/cm2 respectively. The damage threshold occurred at an instantaneous dose which is higher that the melt dose of platinum.« less

  11. Using X-ray free-electron lasers for probing of complex interaction dynamics of ultra-intense lasers with solid matter

    SciTech Connect (OSTI)

    Kluge, T., E-mail: t.kluge@hzdr.de; Huang, L. G.; Metzkes, J.; Bussmann, M. [Helmholtz-Zentrum Dresden-Rossendorf e.V., D-01328 Dresden (Germany)] [Helmholtz-Zentrum Dresden-Rossendorf e.V., D-01328 Dresden (Germany); Gutt, C. [Universität Siegen, D-57068 Siegen (Germany)] [Universität Siegen, D-57068 Siegen (Germany); Schramm, U.; Cowan, T. E. [Helmholtz-Zentrum Dresden-Rossendorf e.V., D-01328 Dresden (Germany) [Helmholtz-Zentrum Dresden-Rossendorf e.V., D-01328 Dresden (Germany); Technische Universität Dresden, D-01062 Dresden (Germany)

    2014-03-15

    We demonstrate the potential of X-ray free-electron lasers (XFEL) to advance the understanding of complex plasma dynamics by allowing for the first time nanometer and femtosecond resolution at the same time in plasma diagnostics. Plasma phenomena on such short timescales are of high relevance for many fields of physics, in particular in the ultra-intense ultra-short laser interaction with matter. Highly relevant yet only partially understood phenomena become directly accessible in experiment. These include relativistic laser absorption at solid targets, creation of energetic electrons and electron transport in warm dense matter, including the seeding and development of surface and beam instabilities, ambipolar expansion, shock formation, and dynamics at the surfaces or at buried layers. In this paper, we focus on XFEL plasma probing for high power laser matter interactions based on quantitative calculations using synthesized data and evaluate the feasibility of various imaging and scattering techniques with special focus on the small angle X-ray scattering technique.

  12. A Comparison of Short Rayleigh Range FEL Performance with Simulations

    SciTech Connect (OSTI)

    Benson, Stephen; Evtushenko, Pavel; Michelle D. Shinn; Neil, George; Blau, Joe; Burggraff, D.; Colson, William; Crooker, P.P.; Sans Aguilar, J.

    2007-08-01

    One approach to attaining very high power in a free-electron laser (FEL) is to operate with a Rayleigh range much smaller than the wiggler length. Previously, 3D simulations of Free-electron laser (FEL) oscillators showed that FEL gain doesn't fall off with Rayleigh range as predicted by one-dimensional simulations*. They also predict that the angular tolerance for the mirrors is much large than simplistic theory predicts. Using the IR Upgrade laser at Jefferson Lab lasing at 935 nm we have studied the performance of an FEL with very short Rayleigh range. We also looked at the angular sensitivity for several different Rayleigh ranges. We find very good agreement between simulations and measured gain and angular sensitivities. Surprisingly the gain continues to rise as the Rayleigh range is shortened and continues to grow even when the resonator becomes geometrically unstable. The same behavior is seen in both the experiment and simulations. We also find that, even for large Rayleigh r

  13. FEL Program | Jefferson Lab

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

    lab's expertise in superconducting radiofrequency (SRF) accelerators. The FEL uses electrons to produce laser light. The electrons are energized using the lab's superconducting...

  14. Experimental Test of Hole-Coupled FEL Resonator Designs Using a CW-HeNe Laser

    E-Print Network [OSTI]

    Leemans, W.P.

    2011-01-01

    Proc. 14 th International FEL Conference, Kobe, Japan, 23-24Test of Hole-Coupled FEL Resonator Designs Using a CW-HeNeuse of hole-coupling for FEL's are: I) reasonable coupling

  15. Feedback Requirements for SASE-FELs

    SciTech Connect (OSTI)

    Loos, Henrik; /SLAC

    2012-07-06

    The operation of a Self Amplified Spontaneous Emission (SASE) Free Electron Lasers (FEL) at soft and hard X-ray wavelengths driven by a high brightness electron beam imposes strong requirements on the stability of the accelerator and feedback systems are necessary to both guarantee saturation of the SASE process as well as a stable photon beam for user experiments. Diagnostics for the relevant transverse and longitudinal beam parameters are presented and various examples of feedback systems for bunches with low repetition rate as well as systems for intra bunch train feedbacks are discussed.

  16. Key Laser Technologies for X-Ray FELs

    SciTech Connect (OSTI)

    Kaertner, Franz

    2013-08-31

    In the final project period, we demonstrated sub femtosecond timing distribution over a 1.2 km polarization-maintaining (PM) fiber-optic link using balanced optical cross-correlators (BOCs) for link stabilization. By eliminating polarization mode dispersion, link operation for 16 days maintained 0.6 fs RMS timing drift and during a 3-day interval only 0.13 fs drift, which corresponds to a stability level of 10-21. To improve the overall system efficiency and robustness, we developed fiber-coupled, hybrid-integrated BOCs using waveguides in periodically-poled KTiOPO4 (PPKTP). The measured second-harmonic conversion efficiency in the waveguides is a factor of 50 higher than that of bulk-optic crystals. Characterization of 1st-generation devices shows performance comparable to free-space BOCs, with the potential for significant improvement in future devices. For optical-to-RF conversion, we developed two balanced optical-microwave phase detectors (BOM-PD) based on the Sagnac and Mach-Zehnder interferometers. RF extraction using BOM-PDs in phase-locked loops yielded sub-10-fs residual timing jitter for locking bandwidths on the order of several hundred kHz. Finally, we characterized the timing jitter of ultralow-noise Ti:Sapphire oscillators, demonstrating an unprecedented 13 as of jitter integrated over the entire Nyquist band. Our measurements agreed well with theory, confirming our models for quantum-limited laser noise. Measurements of commercially available solid-state lasers at 1550 nm showed that there are laser sources already available with sufficiently low noise to achieve sub-femtosecond performance as master oscillators within a timing distribution system.

  17. Application of a PWFA to an X-ray FEL

    E-Print Network [OSTI]

    Israeli, Yasmine; Reiche, Sven; Pedrozzi, Marco; Muggli, Patric

    2016-01-01

    There is a growing demand for X-ray Free-electron lasers (FELs) in various science fields, in particular for those with short pulses, larger photon fluxes and shorter wavelengths. The level of X-ray power and the pulse energy depend on the amount of electron bunch energy. Increasing the latter will increase the power of the radiating X-rays. Using numerical simulations we explore the possibility of using a plasma wakefield accelerator (PWFA) scheme to increase the electron beam energy of an existing FEL facility without significantly increasing the accelerator length. In this paper we use parameters of the SwissFEL beam. The simulations are carried out in 2D cylindrical symmetry using the code OSIRIS. Initial results show an energy gain of ~2 GeV after propagation of 0.5 m in the plasma with a relative energy spread of ~1%.

  18. Development of an X-ray pixel detector with multi-port charge-coupled device for X-ray free-electron laser experiments

    SciTech Connect (OSTI)

    Kameshima, Takashi; Ono, Shun; Kudo, Togo; Ozaki, Kyosuke; Kirihara, Yoichi; Kobayashi, Kazuo; Inubushi, Yuichi; Yabashi, Makina; Hatsui, Takaki; RIKEN SPring-8 Center, 1-1-1 Kouto, Sayo-cho, Sayo-gun, Hyogo 679-5148 ; Horigome, Toshio; Holland, Andrew; Holland, Karen; Burt, David; Murao, Hajime

    2014-03-15

    This paper presents development of an X-ray pixel detector with a multi-port charge-coupled device (MPCCD) for X-ray Free-Electron laser experiments. The fabrication process of the CCD was selected based on the X-ray radiation hardness against the estimated annual dose of 1.6 × 10{sup 14} photon/mm{sup 2}. The sensor device was optimized by maximizing the full well capacity as high as 5 Me- within 50 ?m square pixels while keeping the single photon detection capability for X-ray photons higher than 6 keV and a readout speed of 60 frames/s. The system development also included a detector system for the MPCCD sensor. This paper summarizes the performance, calibration methods, and operation status.

  19. Accelerator Design Study for a Soft X-Ray Free Electron Laser at the Lawrence Berkeley National Laboratory

    E-Print Network [OSTI]

    Kur, E.

    2010-01-01

    and Phase Diagnostics, SLAC Report LCLS-TN-00-12. Emma P.al. 2009, First Results of the LCLS Laser-Heater System, PACLinac Coherent Light Source (LCLS) Conceptual Design Report,

  20. FEL potential of eRHIC

    SciTech Connect (OSTI)

    Litvinenko, V.N.; Ben-Zvi, I.; Hao, Y.; Kao, C-C.; Kayran, D.; Murphy, J.B.; Ptitsyn, V.; Trbojevic, D.; Tsoupas, N.

    2010-08-23

    Brookhaven National Laboratory plans to build a 5-to-30 GeV energy-recovery linac (ERL) for its future electron-ion collider, eRHIC. In past few months, the Laboratory turned its attention to the potential of this unique machine for free electron lasers (FELS), which we initially assessed earlier. In this paper, we present our current vision of a possible FEL farm, and of narrow-band FEL-oscillators driven by this accelerator. eRHIC, the proposed electron-ion collider at BNL, takes advantage of the existing Relativistic Heavy Ion Collider (RHIC) complex. Plans call for adding a six-pass super-conducting (SRF) ERL to this complex to collide polarized- and unpolarized- electron beams with heavy ions (with energies up to 130 GeV per nucleon) and with polarized protons (with energies up to 325 GeV). RHIC, with a circumference of 3.834 km, has three-fold symmetry and six straight sections each {approx} 250 m long. Two of these straight sections will accommodate 703-MHz SRF linacs. The maximum energy of the electron beam in eRHIC will be reached in stages, from 5 GeV to 30 GeV, by increasing the lengths of its SRF linacs. We plan to install at the start the six-pass magnetic system with small gap magnets. The structure of the eRHIC's electron beam will be identical with that of its hadron beam, viz., 166 bunches will be filled, reserving about a one-microsecond gap for the abort kicker. With modest modifications, we can assure that eRHIC's ERL will become an excellent driver for continuous wave (CW) FELs (see Fig.1). The eRHIC's beam structure will support the operation of several such FELs in parasitic mode.

  1. The FERMI@Elettra free-electron-laser source for coherent X-ray physics: photon properties, beam transport system, and applications

    E-Print Network [OSTI]

    Allaria, Enrico

    2010-01-01

    49625-Rev. 1 (also SLAC Rpt. LCLS-TN-04-3) Fawley W M 2006wavelength FELs (e.g. , FLASH, LCLS, SCSS, XFEL, SPARX) have

  2. Self-seeded injection-locked FEL amplifer

    DOE Patents [OSTI]

    Sheffield, Richard L. (Los Alamos, NM)

    1999-01-01

    A self-seeded free electron laser (FEL) provides a high gain and extraction efficiency for the emitted light. An accelerator outputs a beam of electron pulses to a permanent magnet wiggler having an input end for receiving the electron pulses and an output end for outputting light and the electron pulses. An optical feedback loop collects low power light in a small signal gain regime at the output end of said wiggler and returns the low power light to the input end of the wiggler while outputting high power light in a high signal gain regime.

  3. DarkLight: A Search for Dark Forces at the Jefferson Laboratory Free-Electron Laser Facility

    SciTech Connect (OSTI)

    Balewski, Jan; Bernauer, J.; Bertozzi, William; Bessuille, Jason; Buck, B.; Cowan, Ray; Dow, K.; Epstein, C.; Fisher, Peter; Gilad, Shalev; Ihloff, Ernest; Kahn, Yonatan; Kelleher, Aidan; Kelsey, J.; Milner, Richard; Moran, C.; Ou, Longwu; Russell, R.; Schmookler, Barak; Thaler, J.; Tschalar, C.; Vidal, Christopher; Winnebeck, A.; Benson, Stephen [JLAB; Gould, Christopher [JLAB; Biallas, George [JLAB; Boyce, James [JLAB; Coleman, James [JLAB; Douglas, David [JLAB; Ent, Rolf [JLAB; Evtushenko, Pavel [JLAB; Fenker, Howard [JLAB; Gubeli, Joseph [JLAB; Hannon, Fay [JLAB; Huang, Jia [JLAB; Jordan, Kevin [JLAB; Legg, Robert [JLAB; Marchlik, Matthew [JLAB; Moore, Steven [JLAB; Neil, George [JLAB; Shinn, Michelle D [JLAB; Tennant, Christopher [JLAB; Walker, Richard [JLAB; Williams, Gwyn [JLAB; Zhang, Shukui [JLAB; Freytsis, M.; Fiorito, Ralph; O'Shea, P.; Alarcon, Ricardo; Dipert, R.; Ovanesyan, G.; Gunter, Thoth; Kalantarians, Narbe; Kohl, M.; Albayrak, Ibrahim; Horn, Tanja; Gunarathne, D. S.; Martoff, C. J.; Olvitt, D. L.; Surrow, Bernd; Lia, X.; Beck, Reinhard; Schmitz, R.; Walther, D.; Brinkmann, K.; Zaunig, H.

    2014-05-01

    We give a short overview of the DarkLight detector concept which is designed to search for a heavy photon A' with a mass in the range 10 MeV/c^2 < m(A') < 90 MeV/c^2 and which decays to lepton pairs. We describe the intended operating environment, the Jefferson Laboratory free electon laser, and a way to extend DarkLight's reach using A' --> invisible decays.

  4. Multiphoton above-threshold ionization in superintense free-electron x-ray laser fields: Beyond the dipole approximation

    E-Print Network [OSTI]

    Zhou, Zhongyuan; Chu, Shih-I

    2013-02-13

    maximum value kM , and the probability of the electron is negligible when the electron momentum is greater than kM . Thus the wave function of an electron can be calculated within a finite P space with a simple zero-boundary condition as long... as the boundary is set at a properly large kM . *zyzhou@uga.edu †sichu@ku.edu This approximation has been successfully used to study the multiphoton above-threshold ionization (ATI) spectra of a hydrogen atom in longer-wavelength and shorter-pulse laser fields...

  5. Numerical Modeling on Thermal Loading of Diamond Crystal in X-ray FEL Oscillator

    E-Print Network [OSTI]

    Song, Meiqi; Guo, Yuhang; Li, Kai; Deng, Haixiao

    2015-01-01

    Due to high reflectivity and high resolution to X-ray pulse, diamond is one of the most popular Bragg crystals serving as the reflecting mirror and mono-chromator in the next generation free electrons lasers (FELs). The energy deposition of X-rays will result in thermal heating, and thus lattice expanding of diamond crystal, which may degrade the performance of X-ray FELs. In this paper, the thermal loading effect of diamond crystal for X-ray FEL oscillator has been systematically studied by the combined simulation of Geant4 and ANSYS, and its dependence on the environment temperature, crystal size, X-ray pulse repetition rate and pulse energy are presented.

  6. Optical Fibre Dosimeter for SASE FEL Undulators

    E-Print Network [OSTI]

    Körfer, M

    2003-01-01

    Single pass Free Electron Lasers (FELs) based on self-amplified spontaneous emission (SASE) are developed for high brightness and short wavelength applications. They use permanent magnet undulators which are radiation sensitive devices. During accelerator commissioning beam losses can appear anywhere along the undulator line. To avoid damage of the permanent magnets due to radiation, an optical fibre dosimeter system can be used. The increase of absorption caused by ionizing radiation is measured in radiation sensitive optical fibers. The dose system enables relatively fast particle loss tuning during accelerator operation and allows the monitoring of the accumulated dose. Dose measurements in narrow gaps which are inaccessible for any other (online) dosimeter type become possible. The electromagnetic insensitivity of optical fibre sensor is an advantage of applications in strong magnetic undulator fields. At each location the light absorption is measured by using an optical power-meter. The dynamic range is ...

  7. Impedance-Based Analysis of the Relativistic Klystron and the Coupled-Cavity Free-Electron Laser Two-Beam Accelerator

    E-Print Network [OSTI]

    Wurtele, Jonathan S.

    2008-01-01

    of the relativistic klystron. REFERENCES 1. A.M. Sessler, inof both the relativistic klystron (RK) and the standing-wavethrough a Relativistic Klystron (RK) or a Free-Electron

  8. First Person -- George Neil Named Head of FEL Program (Inside...

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

    first-person-george-neil-named-head-fel-program-inside-business First Person -- George Neil By Lakeshia Artis, Inside Business March 3, 2008 George Neil, head of the Free-Electron...

  9. A 4 to 0.1 nm FEL Based on the SLAC Linac

    SciTech Connect (OSTI)

    Pellegrini, C.; /UCLA

    2012-06-05

    The author show that using existing electron gun technology and a high energy linac like the one at SLAC, it is possible to build a Free Electron Laser operating around the 4 nm water window. A modest improvement in the gun performance would further allow to extend the FEL to the 0.1 nm region. Such a system would produce radiation with a brightness many order of magnitude above that of any synchrotron radiation source, existing or under construction, with laser power in the multigawatt region and subpicosecond pulse length.

  10. Method of Linear Invariants for description of beam dynamics of FEL undulator

    E-Print Network [OSTI]

    A. Angelow; D. Trifonov; V. Angelov; H. Hristov

    2008-05-23

    We propose a new model for description of electrons beam dynamics in Free Electron Laser (FEL) undulator, based on the method of linear time-dependent invariants of quantum-mechanical charge particle. The magnetic field has periodic structure along the undulator. For this problem, described by time-dependent quadratic Hamiltonian, we obtain exact solution. The time-evolutions of the tree quantum fluctuations: covariance cov(q,p), var(q) and var(p) for the charge particle in this case are also determined. This research will help to optimize the FEL undulator: for example, using a 2.5 GeV linear electron accelerator it will be possible to emit radiation at 1.5 nm and shorter length. This method could be applicable also to any device with periodic structure of applied field (e.g. Tokamak, cyclic accelerators) for the case of charge non-relativistic quantum particles.

  11. An analysis of the saturation of a high gain FEL

    SciTech Connect (OSTI)

    Gluckstern, R.L.; Okamoto, Hiromi; Krinsky, S.

    1992-12-01

    We study the saturated state of an untapered free electron laser in the Compton regime, arising after exponential amplification of an initial low level of radiation by an initially monoenergetic, unbunched electron beam. The saturated state of the FEL is described by oscillations about an equilibrium state. Using the two invariants of the motion, and certain assumptions motivated by computer simulations, we provide approximate analytic descriptions of the radiation field and electron distribution in the saturation regime. We first consider a one-dimensional approximation, and later extend our approach to treat an electron beam of finite radial extent. Of note is a result on the radiated power in the case of an electron beam with small radius.

  12. Serial snapshot crystallography for materials science with SwissFEL

    DOE Public Access Gateway for Energy & Science Beta (PAGES Beta)

    Dejoie, Catherine; Smeets, Stef; Baerlocher, Christian; Tamura, Nobumichi; Pattison, Philip; Abela, Rafael; McCusker, Lynne B.

    2015-04-21

    New opportunities for studying (sub)microcrystalline materials with small unit cells, both organic and inorganic, will open up when the X-ray free electron laser (XFEL) presently being constructed in Switzerland (SwissFEL) comes online in 2017. Our synchrotron-based experiments mimicking the 4%-energy-bandpass mode of the SwissFEL beam show that it will be possible to record a diffraction pattern of up to 10 randomly oriented crystals in a single snapshot, to index the resulting reflections, and to extract their intensities reliably. The crystals are destroyed with each XFEL pulse, but by combining snapshots from several sets of crystals, a complete set of datamore »can be assembled, and crystal structures of materials that are difficult to analyze otherwise will become accessible. Even with a single shot, at least a partial analysis of the crystal structure will be possible, and with 10–50 femtosecond pulses, this offers tantalizing possibilities for time-resolved studies.« less

  13. PROSPECTS FOR THE FEL

    E-Print Network [OSTI]

    Sessler, A.M.

    2008-01-01

    et aI, "Proposal for a Compact FEL With Electromagnetic WaveSuperradiance in the High-Gain FEL, Nucl. Instr. and MethodsProc. of the 10th Inter. FEL Conference, Lawrence Livermore

  14. TESLA-FEL 2003-04 Waveguide Monitors -a New Type of Beam Position

    E-Print Network [OSTI]

    TESLA-FEL 2003-04 Waveguide Monitors - a New Type of Beam Position Monitors for the TTF FEL U. Hahn Laser (FEL) at the TESLA Test Facilty (TTF) requires the electron trajectory to be aligned bench in the laboratory and with beam. TTF FEL measurement results are also presented and possible

  15. 9/16/11 11:18 PMAPS -53rd Annual Meeting of the APS Division of Plasma Physics -Event ...stler amplification: a free electron laser in the Earth's magnetosphere Page 1 of 2http://meetings.aps.org/Meeting/DPP11/Event/153292

    E-Print Network [OSTI]

    Ng, Chung-Sang

    9/16/11 11:18 PMAPS -53rd Annual Meeting of the APS Division of Plasma Physics - Event ...stler.org/Meeting/DPP11/Event/153292 Bulletin of the American Physical Society 53rd Annual Meeting of the APS Division Meeting of the APS Division of Plasma Physics - Event ...stler amplification: a free electron laser

  16. Towards simultaneous measurements of electronic and structural properties in ultra-fast x-ray free electron laser absorption spectroscopy experiments

    SciTech Connect (OSTI)

    Gaudin, J.; Fourment, C.; Cho, B. I.; Engelhorn, K.; Galtier, E.; Harmand, M.; Leguay, P. M.; Lee, H. J.; Nagler, B.; Nakatsutsumi, M.; Ozkan, C.; Störmer, M.; Toleikis, S.; Tschentscher, Th.; Heimann, P. A.; Dorchies, F.

    2014-04-17

    The rapidly growing ultrafast science with X-ray lasers unveils atomic scale processes with unprecedented time resolution bringing the so called “molecular movie” within reach. X-ray absorption spectroscopy is one of the most powerful x-ray techniques providing both local atomic order and electronic structure when coupled with ad-hoc theory. Collecting absorption spectra within few x-ray pulses is possible only in a dispersive setup. We demonstrate ultrafast time-resolved measurements of the LIII-edge x-ray absorption near-edge spectra of irreversibly laser excited Molybdenum using an average of only few x-ray pulses with a signal to noise ratio limited only by the saturation level of the detector. The simplicity of the experimental set-up makes this technique versatile and applicable for a wide range of pump-probe experiments, particularly in the case of non-reversible processes.

  17. Towards simultaneous measurements of electronic and structural properties in ultra-fast x-ray free electron laser absorption spectroscopy experiments

    DOE Public Access Gateway for Energy & Science Beta (PAGES Beta)

    Gaudin, J.; Fourment, C.; Cho, B. I.; Engelhorn, K.; Galtier, E.; Harmand, M.; Leguay, P. M.; Lee, H. J.; Nagler, B.; Nakatsutsumi, M.; et al

    2014-04-17

    The rapidly growing ultrafast science with X-ray lasers unveils atomic scale processes with unprecedented time resolution bringing the so called “molecular movie” within reach. X-ray absorption spectroscopy is one of the most powerful x-ray techniques providing both local atomic order and electronic structure when coupled with ad-hoc theory. Collecting absorption spectra within few x-ray pulses is possible only in a dispersive setup. We demonstrate ultrafast time-resolved measurements of the LIII-edge x-ray absorption near-edge spectra of irreversibly laser excited Molybdenum using an average of only few x-ray pulses with a signal to noise ratio limited only by the saturation level ofmore »the detector. The simplicity of the experimental set-up makes this technique versatile and applicable for a wide range of pump-probe experiments, particularly in the case of non-reversible processes.« less

  18. High Average Brightness Photocathode Development for FEL Applications...

    Office of Scientific and Technical Information (OSTI)

    Laser Conference, FEL 2013; Manhattan, NY; 20130826 through 20130830 Research Org: Brookhaven National Laboratory (BNL) Sponsoring Org: USDOE SC OFFICE OF SCIENCE (SC) Country of...

  19. Simulation studies on laser pulse stability for Dalian Coherent Light Source

    E-Print Network [OSTI]

    Deng, Haixiao; Gu, Duan; Liu, Bo; Gu, Qiang; Wang, Dong

    2013-01-01

    Dalian Coherent Light Source will use a 300MeV LINAC to produce fully coherent photon pulses in the wavelength range between 150-50nm by high gain harmonic generation free electron laser (FEL) scheme. To generate stable FEL pulses, stringent tolerance budget is required for the LINAC output parameters, such as the mean beam energy stability, electron bunch arrival time jitter, peak current variation and the transverse beam position offset. In order to provide guidance for the design of the Dalian Coherent Light Source, in this paper, the sensitivity of FEL pulse energy fluctuation to various error sources of the electron bunch was performed using intensive start-to-end FEL simulations.

  20. X-band photoinjector for a chirped-pulse FEL

    SciTech Connect (OSTI)

    Luhmann, Jr., N. C.; Alvis, R. M.; Baldis, H. A.; Hartemann, F. V; Heritage, J. P.; Ho, C. H.; Landahl, E. C.; Li, K.; Troha,A. L.; White, W. E.

    1998-12-15

    The phase noise and jitter characteristics of the laser and rf systems of a high gradient X-band photoinjector have been measured experimentally. When > 100 coherently phased 5 MeV electron bunches are produced in bursts, the photoinjector should be an ideal electron source for a pulsed, pre-bunched free-electron laser (FEL) operating at 100 GHz. The laser oscillator is a self-modelocked Titanium:Sapphire system operating at the 108th subharmonic of the rf gun. The X-band signal is produced from the laser by a phase-locked dielectric resonance oscillator, and amplified by a pulsed TWT and klystron. A comparison between the klystron and TWT amplifier phase noise and the fields excited in the rf gun demonstrates the filtering effect of the high Q structure, thus indicating that the rf gun can be used as a master oscillator, and could be energized by either a rf oscillator such as a magnetron or a compact source such as a cross-field amplifier. In particular, the rf gun can play the role of a pulsed rf clock to synchronize the photocathode laser system: direct drive of a synchronously mode-locked AlGaAs quantum well laser has been achieved using the X0-band gun rf fields. This novel, GHz repetition rate, sub-picosecond laser system is being developed to replace the more conventional femtosecond Ti: Al2O3 system. Some advantages include pumping this laser with a stabilized current source instead of a costly, low efficiency pump laser. Finally, dark current measurements and initial photoelectron measurements are reported.

  1. Production and Detection of Axion-Like Particles at the VUV-FEL: Letter of Intent

    E-Print Network [OSTI]

    Ulrich Koetz; Andreas Ringwald; Thomas Tschentscher

    2006-06-26

    Recently, the PVLAS collaboration has reported evidence for an anomalously large rotation of the polarization of light generated in vacuum in the presence of a transverse magnetic field. This may be explained through the production of a new light spin-zero particle coupled to two photons. In this Letter of Intent, we propose to test this hypothesis by setting up a photon regeneration experiment which exploits the photon beam of the Vacuum-UltraViolet Free-Electron Laser VUV-FEL, sent along the transverse magnetic field of a linear arrangement of dipole magnets of size B L ~ 30 Tm. The high photon energies available at the VUV-FEL increase substantially the expected photon regeneration rate in the mass range implied by the PVLAS anomaly, in comparison to the rate expected at visible lasers of similar power. We find that the particle interpretation of the PVLAS result can be tested within a short running period. The pseudoscalar vs. scalar nature can be determined by varying the direction of the magnetic field with respect to the laser polarization. The mass of the particle can be measured by running at different photon energies. The proposed experiment offers a window of opportunity for a firm establishment or exclusion of the particle interpretation of the PVLAS anomaly before other experiments can compete.

  2. A Proof-of-Principle Echo-enabled Harmonic Generation Free Electron...

    Office of Scientific and Technical Information (OSTI)

    ThesisDissertation: A Proof-of-Principle Echo-enabled Harmonic Generation Free Electron Laser Experiment at SLAC Citation Details In-Document Search Title: A Proof-of-Principle...

  3. TESLA-FEL Report 2005-06 DIGITAL LOW LEVEL RF CONTROL SYSTEM FOR THE DESY TTF

    E-Print Network [OSTI]

    TESLA-FEL Report 2005-06 DIGITAL LOW LEVEL RF CONTROL SYSTEM FOR THE DESY TTF VUV-FEL LINAC Valeri Electron Laser (VUV-FEL) Linac each klystron supplies RF power to up to 32 cavities. The superconducting. The VUV-FEL Linac RF control system employs a completely digital feedback system to provide flexibility

  4. Isochronous Beamlines for Free Electron Lasers

    E-Print Network [OSTI]

    Berz, M.

    2010-01-01

    and A. H. Lumpkin. Electron-beam diagnostics and results forDiagnostics and Transport to the Beam Dump After the electron

  5. Metal Photocathodes for Free Electron Laser Applications

    E-Print Network [OSTI]

    Greaves, Corin Michael Ricardo

    2012-01-01

    Individual steps of the Dowell-Spicer Three Step Model oftotal quantum yield of the Dowell-Spicer Three step model ofof Photocathodes. [3] D. H. Dowell. “Modeling the QE and

  6. Feasibility of an XUV FEL Oscillator Driven by a SCRF Linear Accelerator

    SciTech Connect (OSTI)

    Lumpkin, A. H.; Freund, H. P.; Reinsch, M.

    2014-01-01

    The Advanced Superconducting Test Accelerator (ASTA) facility is currently under construction at Fermi National Accelerator Laboratory. Using a1-ms-long macropulse composed of up to 3000 micropulses, and with beam energies projected from 45 to 800 MeV, the possibility for an extreme ultraviolet (XUV) free-electron laser oscillator (FELO) with the higher energy is evaluated. We have used both GINGER with an oscillator module and the MEDUSA/OPC code to assess FELO saturation prospects at 120 nm, 40 nm, and 13.4 nm. The results support saturation at all of these wavelengths which are also shorter than the demonstrated shortest wavelength record of 176 nm from a storage-ring-based FELO. This indicates linac-driven FELOs can be extended into this XUV wavelength regime previously only reached with single-pass FEL configurations.

  7. Greenfield FELs John Galayda, SLAC

    E-Print Network [OSTI]

    coverage (fundamental) 3 (5)1 (8)# FEL undulators 2012 (?)2009 (2013)Operation start TESLA (upgrade) LCLS (upgrade) X-ray FEL Projects in Preconstruction #12;Status of X-ray FELs in 2015 · LCLS and TESLA FEL ­ Self-seeding ­ Ultrashort pulse · HGHG scheme #12;SASE FEL for 30 keV · LCLS reference parameters: =

  8. TESLA FEL-Report 2000-02 TESLA FEL-Report 2000-02

    E-Print Network [OSTI]

    TESLA FEL-Report 2000-02 #12;TESLA FEL-Report 2000-02 #12;TESLA FEL-Report 2000-02 #12;TESLA FEL-Report 2000-02 #12;TESLA FEL-Report 2000-02 #12;TESLA FEL-Report 2000-02 #12;TESLA FEL-Report 2000-02 #12;TESLA FEL-Report 2000-02 #12;TESLA FEL-Report 2000-02 #12;TESLA FEL-Report 2000-02 #12;TESLA FEL

  9. TESLA FEL-Report 1995-04 TESLA FEL-Report 1995-04

    E-Print Network [OSTI]

    #12;TESLA FEL-Report 1995-04 #12;TESLA FEL-Report 1995-04 #12;TESLA FEL-Report 1995-04 #12;TESLA FEL-Report 1995-04 #12;TESLA FEL-Report 1995-04 #12;TESLA FEL-Report 1995-04 #12;TESLA FEL-Report 1995-04 #12;TESLA FEL-Report 1995-04 #12;TESLA FEL-Report 1995-04 #12;TESLA FEL-Report 1995-04 #12;TESLA FEL

  10. TESLA FEL-Report 1995-02 TESLA FEL-Report 1995-02

    E-Print Network [OSTI]

    TESLA FEL-Report 1995-02 #12;TESLA FEL-Report 1995-02 #12;TESLA FEL-Report 1995-02 #12;TESLA FEL-Report 1995-02 #12;TESLA FEL-Report 1995-02 #12;TESLA FEL-Report 1995-02 #12;TESLA FEL-Report 1995-02 #12;TESLA FEL-Report 1995-02 #12;TESLA FEL-Report 1995-02 #12;TESLA FEL-Report 1995-02 #12;TESLA FEL

  11. TESLA FEL-Report 1999-03 TESLA FEL-Report 1999-03

    E-Print Network [OSTI]

    TESLA FEL-Report 1999-03 #12;TESLA FEL-Report 1999-03 #12;TESLA FEL-Report 1999-03 #12;TESLA FEL-Report 1999-03 #12;TESLA FEL-Report 1999-03 #12;TESLA FEL-Report 1999-03 #12;TESLA FEL-Report 1999-03 #12;TESLA FEL-Report 1999-03 #12;TESLA FEL-Report 1999-03 #12;TESLA FEL-Report 1999-03 #12;TESLA FEL

  12. TESLA FEL-Report 1997-02 TESLA FEL-Report 1997-02

    E-Print Network [OSTI]

    TESLA FEL-Report 1997-02 #12;TESLA FEL-Report 1997-02 #12;TESLA FEL-Report 1997-02 #12;TESLA FEL-Report 1997-02 #12;TESLA FEL-Report 1997-02 #12;TESLA FEL-Report 1997-02 #12;TESLA FEL-Report 1997-02 #12;TESLA FEL-Report 1997-02 #12;TESLA FEL-Report 1997-02 #12;TESLA FEL-Report 1997-02 #12;TESLA FEL

  13. TESLA FEL Report 1996-07 TESLA FEL Report 1996-07

    E-Print Network [OSTI]

    TESLA FEL Report 1996-07 #12;TESLA FEL Report 1996-07 #12;TESLA FEL Report 1996-07 #12;TESLA FEL Report 1996-07 #12;TESLA FEL Report 1996-07 #12;TESLA FEL Report 1996-07 #12;TESLA FEL Report 1996-07 #12;TESLA FEL Report 1996-07 #12;TESLA FEL Report 1996-07 #12;TESLA FEL Report 1996-07 #12;TESLA FEL Report

  14. TESLA FEL-Report 1996-10 TESLA FEL-Report 1996-10

    E-Print Network [OSTI]

    #12;TESLA FEL-Report 1996-10 #12;TESLA FEL-Report 1996-10 #12;TESLA FEL-Report 1996-10 #12;TESLA FEL-Report 1996-10 #12;TESLA FEL-Report 1996-10 #12;TESLA FEL-Report 1996-10 #12;TESLA FEL-Report 1996-10 #12;TESLA FEL-Report 1996-10 #12;TESLA FEL-Report 1996-10 #12;TESLA FEL-Report 1996-10 #12;TESLA FEL

  15. TESLA FEL-Report 1996-16 TESLA FEL-Report 1996-16

    E-Print Network [OSTI]

    #12;TESLA FEL-Report 1996-16 #12;TESLA FEL-Report 1996-16 #12;TESLA FEL-Report 1996-16 #12;TESLA FEL-Report 1996-16 #12;TESLA FEL-Report 1996-16 #12;TESLA FEL-Report 1996-16 #12;TESLA FEL-Report 1996-16 #12;TESLA FEL-Report 1996-16 #12;TESLA FEL-Report 1996-16 #12;TESLA FEL-Report 1996-16 #12;TESLA FEL

  16. TESLA FEL-Report 1996-13 TESLA FEL-Report 1996-13

    E-Print Network [OSTI]

    TESLA FEL-Report 1996-13 #12;TESLA FEL-Report 1996-13 #12;TESLA FEL-Report 1996-13 #12;TESLA FEL-Report 1996-13 #12;TESLA FEL-Report 1996-13 #12;TESLA FEL-Report 1996-13 #12;TESLA FEL-Report 1996-13 #12;TESLA FEL-Report 1996-13 #12;TESLA FEL-Report 1996-13 #12;TESLA FEL-Report 1996-13 #12;TESLA FEL

  17. TESLA FEL Report 1996-06 TESLA FEL Report 1996-06

    E-Print Network [OSTI]

    TESLA FEL Report 1996-06 #12;TESLA FEL Report 1996-06 #12;TESLA FEL Report 1996-06 #12;TESLA FEL Report 1996-06 #12;TESLA FEL Report 1996-06 #12;TESLA FEL Report 1996-06 #12;TESLA FEL Report 1996-06 #12;TESLA FEL Report 1996-06 #12;TESLA FEL Report 1996-06 #12;TESLA FEL Report 1996-06 #12;TESLA FEL Report

  18. Freie Elektronenlaser VUV-FEL Freie Elektronenlaser VUV-FEL

    E-Print Network [OSTI]

    Freie Elektronenlaser VUV-FEL Freie Elektronenlaser VUV-FEL Nach der Inbetriebnahme des neuen Beschleunigungsmodulen kann eine Strahlenergie von etwa 730 MeV erreicht werden. Am 14. Januar wurde zum ersten Mal FEL einem FEL erzeugt wurde. Das Experimentierprogramm f¨ur externe Nutzer be- gann im Sommer 2005 mit der

  19. FUTURE FEL STUDIES AT THE VISA EXPERIMENT G. Andonian, M. Dunning, A. Murokh, C. Pellegrini, S. Reiche, J. Rosenzweig,

    E-Print Network [OSTI]

    Brookhaven National Laboratory

    FUTURE FEL STUDIES AT THE VISA EXPERIMENT G. Andonian, M. Dunning, A. Murokh, C. Pellegrini, S, in 2003, have demonstrated an anomalously large bandwidth spread of the FEL spectrum due to off- angle- cludes a study of a seeded FEL, using a 1 micron YAG laser as a seed, and the accompanying diagnostics

  20. FERMI@Elettra FEL Design Technical Optimization Final Report

    E-Print Network [OSTI]

    Fawley, William; Penn, Gregory; Allaria, Enrico; De Ninno, Giovanni; Graves, William

    2006-01-01

    LBNL-61333 FERMI@Elettra FEL Design Technical Optimization1 Basic FEL Output5 Important Phenomena which affect the FEL

  1. TESLA FEL-Report 1999-04 TESLA FEL-Report 1999-07

    E-Print Network [OSTI]

    TESLA FEL-Report 1999-04 TESLA FEL-Report 1999-07 #12;TESLA FEL-Report 1999-04 TESLA FEL-Report 1999-07 #12;TESLA FEL-Report 1999-04 TESLA FEL-Report 1999-07 #12;TESLA FEL-Report 1999-04 TESLA FEL-Report 1999-07 #12;TESLA FEL-Report 1999-04 TESLA FEL-Report 1999-07 #12;TESLA FEL-Report 1999-04 TESLA FEL

  2. FEL Design Studies at LBNL: Activities and Plans

    E-Print Network [OSTI]

    Corlett, John N.

    2009-01-01

    FEL Design Studies at LBNL: Activities and Plans* J.FELs, and participate in two FEL construction projects. Ourand performance limitations of FEL facilities. An internally

  3. TESLA-FEL 2006-04 Far-Infrared Transition and Diffraction Radiation

    E-Print Network [OSTI]

    TESLA-FEL 2006-04 Far-Infrared Transition and Diffraction Radiation Part II: The THz Beamline at the VUV-FEL Linac Sara Casalbuoni1 , Bernhard Schmidt1 , Peter Schm¨user1,2 , Bernd Steffen1,2 1 Deutsches-Electron Laser (VUV-FEL) at DESY has recently been up- graded to a maximum electron energy of 700 MeV, allowing

  4. Design Studies for a High-Repetition-Rate FEL Facility at LBNL.

    E-Print Network [OSTI]

    CORLETT, J.

    2009-01-01

    high-resolution diagnostics of photon and electron beams, tobeams, free-electron lasers, photocathodes, high-repetition-rate electron-gun systems, laser systems, CW superconducting rf cryomodules, diagnostics,

  5. ON THE RE-ACCELERTION OF BUNCHED BEAMS

    E-Print Network [OSTI]

    Whittum, D.H.

    2008-01-01

    S. S. Yu, "Relativistic Klystron Version of the Two- Beamfor a Relatiyistic Klystron or Free Electron Laser (FEL)INTRODUCTION The Relativistic Klystron} and Free Electron

  6. VISA IB: ULTRA-HIGH BANDWIDTH, HIGH GAIN SASE FEL G. Andonian, A. Murokh, R. Agustsson, C. Pellegrini, S. Reiche, J. B. Rosenzweig, and G. Travish

    E-Print Network [OSTI]

    Brookhaven National Laboratory

    VISA IB: ULTRA-HIGH BANDWIDTH, HIGH GAIN SASE FEL G. Andonian, A. Murokh, R. Agustsson, C spread SASE FEL experiment, the intermediary experiment linking the VISA I and VISA II projects. A highly-election lasers (SASE FEL) promises to be an invalu- able tool for the scientific community. There are current

  7. SASE FEL at the TESLA Facility, Phase 2 The TESLA Test Facility FEL team

    E-Print Network [OSTI]

    SASE FEL at the TESLA Facility, Phase 2 The TESLA Test Facility FEL team June 2002, TESLA-FEL 2002-01 #12;SASE FEL at the TESLA Facility, Phase 2 Abstract The last description of the TESLA Test Facility FEL has been written in 1995 (TESLA- FEL report 95-03). Since then, many changes have developed

  8. TESLA FEL 2004-06 Expected properties of the radiation from VUV-FEL at DESY

    E-Print Network [OSTI]

    TESLA FEL 2004-06 July 2004 Expected properties of the radiation from VUV-FEL at DESY (femtosecond pulse" (200 fs) mode of FEL operation at VUV- FEL, based on a linearized bunch compression that pro- duces FEL radiation. Such a mode of operation was successfully tested at VUV-FEL, Phase I

  9. W-band free-electron masers

    SciTech Connect (OSTI)

    Freund, H. P. [Science Applications International Corp., McLean, Virginia 22102 (United States); Jackson, R. H.; Danly, B. G.; Levush, B. [Naval Research Laboratory, Washington, District of Columbia 20375 (United States)

    1999-05-07

    Theoretical analyses of high power W-band (i.e., {approx_equal}94 GHz) free-electron maser amplifiers are presented for a helical wiggler/cylindrical waveguide configuration using the three-dimensional slow-time-scale ARACHNE simulation code [9]. The geometry treated by ARACHNE is that of an electron beam propagating through the cylindrical waveguide subject to a helical wiggler and an axial guide magnetic field. Two configurations are discussed. The first is the case of a reversed-guide field geometry where the guide field is oriented antiparallel to the helicity of the wiggler field. Using a 330 kV/20 A electron beam, efficiencies of the order of 7% are calculated with a bandwidth (FWHM) of 5 GHz. The second example employs a strong guide field of 20 kG oriented parallel to the helicity of the wiggler. Here, efficiencies of greater than 8% are possible with a FWHM bandwidth of 4.5 GHz using a 300 kV/20 A electron beam. A normalized emittance of 95 mm-mrad is assumed in both cases, and no beam losses are observed for either case. Both cases assume interaction with the fundamental TE{sub 11} mode, which has acceptably low losses in the W-band.

  10. Optical gating and streaking of free-electrons with attosecond precision

    E-Print Network [OSTI]

    Kozak, Martin; Leedle, Kenneth J; Schoenenberger, Norbert; Ruehl, Alex; Hartl, Ingmar; Harris, James S; Byer, Robert L; Hommelhoff, Peter

    2015-01-01

    In this paper we present proof of principle experiments of an optical gating concept for free electrons. We demonstrate a temporal resolution of 1.2+-0.3 fs via energy and transverse momentum modulation as a function of time. The scheme is based on the synchronous interaction between electrons and the near-field mode of a dielectric nano-grating excited by a femtosecond laser pulse with an optical period duration of 6.5 fs. The sub-optical cycle resolution demonstrated here is promising for use in laser-driven streak cameras for attosecond temporal characterization of bunched particle beams as well as time-resolved experiments with free-electron beams. We expect that 10 as temporal resolution will be achieved in the near future using such a scheme.

  11. Stability and Performance of CDRL-FEL

    E-Print Network [OSTI]

    Kim, K.-J.

    2010-01-01

    the EBTL bandwidth is that the FEL saturation takes place atCaptious Figure 1. The FEL spectrum for different cavitypower POP! generated by the FEL interaction is called the

  12. Staged energy cascades for the LUX FEL

    E-Print Network [OSTI]

    Penn, G.

    2004-01-01

    a fully 3D time-dependent FEL simulation code, Nucl. Instr.simulations and general FEL physics. This work was supportedan XUV/soft X-ray harmonic-cascade FEL for the proposed LBNL

  13. HIGH-POWER, HIGH-EFFICIENCY FELS

    E-Print Network [OSTI]

    Sessler, A.M.

    2008-01-01

    M. Kumada, "Scaling of the FEL-ID Equations", ELF Note 128,Instability in a High-power, Short- Wavelength FEL", Proc.of the Ninth FEL" Conference, Williamsburg (1988), and

  14. TTF/VUV-FEL meeting, 21. Mar 06 SaseFelPhotonDiagnostics

    E-Print Network [OSTI]

    TTF/VUV-FEL meeting, 21. Mar 06 SaseFelPhotonDiagnostics Gas Monitor Detector Electronics from charged particles to digital value Fini Jastrow, TTF/VUV-FEL meeting, 21. Mar 06 #12;TTF/VUV-FEL meeting, 21. Mar 06 SaseFelPhotonDiagnostics The Detector Ion Current Measurement Electron Pulse Measurement

  15. Machine Parameter Studies for an FEL Facility Using Staff

    E-Print Network [OSTI]

    Reinsch, M.

    2014-01-01

    PARAMETER STUDIES FOR AN FEL FACILITY USING STAFF ? M.USA Abstract Designing an FEL facility requires balancingmultiple science needs, FEL and accelerator physics

  16. Part 2: Coherent emission from Free Electron Lasers

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

    beam from conventional accelerators is presented. Both spontaneous and coherent emission of electrons is considered. Introduction The importance of the time-resolved studies...

  17. Spreader Design for FERMI@Elettra Free Electron Laser

    E-Print Network [OSTI]

    2008-01-01

    emittance diagnostic section, the electron beam switchyarddiagnostic using optical transition radiation from the screens that can be inserted into the electron beam

  18. The Multi-Cavity Free-Electron Laser

    E-Print Network [OSTI]

    Krishnagopal, S.

    2008-01-01

    A. Vinokurov, "The Optical Klystron Theory and Experiment",One is reminded of an optical klystron [2] or of the "cavities" in a regular klystron. In fact, in our numerical

  19. Jefferson Lab's Free-Electron Laser explores promise of carbon...

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

    and quantum computing and as components for microelectromechanical sensors, or MEMS. The tubes could also function as a "lab on a chip," with attached microelectronics and...

  20. Applications of free electron lasers and synchrotrons in industry...

    Office of Scientific and Technical Information (OSTI)

    in greater depth the potential applications to EUV lithography and to technologies for solar energy. Authors: Barletta, William A. 1 + Show Author Affiliations Dept. of...

  1. Correspondence Principle in Free-Electron Lasers - Comment 

    E-Print Network [OSTI]

    BECKER, W.; McIver, J. K.; Zubairy, M. Suhail

    1985-01-01

    Optimization of the machine and line level issues in an electronic assembly system (EAS) is imperative for the efficient use of resources in the system. This research considers the joint optimization of machine and line ...

  2. Applications of free electron lasers and synchrotrons in industry and

    Office of Scientific and Technical Information (OSTI)

    AFDC Printable Version Share this resource Send a link to EERE: Alternative Fuels Data Center Home Page to someone by E-mail Share EERE: Alternative Fuels Data Center Home Page on Facebook Tweet about EERE: Alternative Fuels Data Center Home Page on Twitter Bookmark EERE: Alternative Fuels Data Center Homesum_a_epg0_fpd_mmcf_m.xls" ,"Available from WebQuantity of NaturalDukeWakefield MunicipalTechnicalInformation4563AbuseConnectJournal Article:(Journalthedefectsresearch

  3. Modeling and Multidimensional Optimization of a Tapered Free Electron Laser

    Office of Scientific and Technical Information (OSTI)

    AFDC Printable Version Share this resource Send a link to EERE: Alternative Fuels Data Center Home Page to someone by E-mail Share EERE: Alternative Fuels Data Center Home Page on Facebook Tweet about EERE: Alternative Fuels Data Center Home Page on Twitter Bookmark EERE: Alternative Fuels Data Center Homesum_a_epg0_fpd_mmcf_m.xls" ,"Available from WebQuantity of NaturalDukeWakefieldSulfate Reducing(JournalspectroscopyReport)Fermentative Activity on Fateof Star

  4. FEL and Optical Klystron Gain for an Electron Beam with Oscillatory Energy Distribution

    SciTech Connect (OSTI)

    Stupakov, G.; Ding, Y.; Huang, Z.; /SLAC

    2009-12-09

    If the energy spread of a beam is larger then the Pierce parameter, the FEL gain length increases dramatically and the FEL output gets suppressed. We show that if the energy distribution of such a beam is made oscillatory on a small scale, the gain length can be considerably decreased. Such an oscillatory energy distribution is generated by first modulating the beam energy with a laser via the mechanism of inverse FEL, and then sending it through a strong chicane. We show that this approach also works for the optical klystron enhancement scheme. Our analytical results are corroborated by numerical simulations.

  5. A STEADY-STATE FEL: PARTICLE DYNAMICS IN THE FEL PORTION OF A TWO-BEAM ACCELERATOR

    E-Print Network [OSTI]

    Sternbach, E.

    2008-01-01

    September 8-13, 1985 A STEADY-STATE FEL: PARTICLE DYNAMICSIN THE FEL PORTION OF A TWO-BEAM ACCELERATOR E. SternbachLBL-19939 A STEADY-STATE FEL: PARTICLE DYNAMICS IN THE FEL

  6. Lasers Used to Make First Boron-Nitride Nanotube Yarn | Jefferson...

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

    with Jefferson Lab's Free-Electron Laser and later perfected using a commercial welding laser. In this technique, the laser beam strikes a target inside a chamber filled...

  7. nova.tex, 781996. SCATTERING OF LIGHT BY FREE ELECTRONS

    E-Print Network [OSTI]

    Rodriguez, Carlos

    nova.tex, 7­8­1996. SCATTERING OF LIGHT BY FREE ELECTRONS as a Test of Quantum Theory \\Lambda E. T. RELATIVISTIC BASIS OF THE SCHR ¨ ODINGER EQUATION 9 8. NON--ARISTOTELIAN SCATTERING OF LIGHT BY ELECTRONS 10 9 dominates every home and office. But on the other hand, this very fact makes it seem strange that a meeting

  8. Harmonic cascade FEL designs for LUX

    E-Print Network [OSTI]

    2004-01-01

    1.3: a fully 3D time-dependent FEL sim- ulation code, Nucl.a XUV/soft X-ray harmonic-cascade FEL for the proposed LBNLLBNL-56329 Harmonic cascade FEL designs for LUX G. Penn, M.

  9. Laser-PlasmaWakefield Acceleration with Higher Order Laser Modes

    E-Print Network [OSTI]

    Geddes, C.G.R.

    2011-01-01

    Design considerations for a laser-plasma linear collider,"E.Esarey, and W.P.Leemans, "Free-electron laser driven bythe LBNL laser-plasma accelerator," in Proc. Adv. Acc. Con.

  10. HARMONIC CASCADE FEL DESIGNS FOR LUX G. Penn, M. Reinsch, J. Wurtele

    E-Print Network [OSTI]

    Wurtele, Jonathan

    HARMONIC CASCADE FEL DESIGNS FOR LUX G. Penn, M. Reinsch, J. Wurtele , J.N. Corlett, W.M. Fawley, A stages of higher harmonic generation, seeded by a 200­250 nm laser of similar duration. This laser mod then produces ra- diation at a higher harmonic after entering a second, differ- ently tuned undulator. Repeated

  11. Optimization of a high efficiency FEL amplifier

    E-Print Network [OSTI]

    Schneidmiller, E A

    2014-01-01

    The problem of an efficiency increase of an FEL amplifier is now of great practical importance. Technique of undulator tapering in the post-saturation regime is used at the existing x-ray FELs LCLS and SACLA, and is planned for use at the European XFEL, Swiss FEL, and PAL XFEL. There are also discussions on the future of high peak and average power FELs for scientific and industrial applications. In this paper we perform detailed analysis of the tapering strategies for high power seeded FEL amplifiers. Application of similarity techniques allows us to derive universal law of the undulator tapering.

  12. Katja Honkavaara, TTF/VUV-FEL meeting, 21.02.2006 TTF/VUV-FEL meeting 21.02.2006

    E-Print Network [OSTI]

    Katja Honkavaara, TTF/VUV-FEL meeting, 21.02.2006 TTF/VUV-FEL meeting 21.02.2006 Overview + QE measurements #12;Katja Honkavaara, TTF/VUV-FEL meeting, 21.02.2006 Accelerator studies in KW 9-14 · Priority on ILC and XFEL related studies (not VUV-FEL) ­ VUV-FEL benefits directly or indirectly from most

  13. Energy of the quasi-free electron in xenon Xianbo Shi a

    E-Print Network [OSTI]

    Findley, Gary L.

    Energy of the quasi-free electron in xenon Xianbo Shi a , Luxi Li a , C.M. Evans a,, G.L. Findley b critical point. The energy of the quasi-free electron, arising from dopant field ionization, in xenon and for the critical isotherm. Key words: supercritical xenon, field ionization, quasi-free electron energy, electron

  14. Towards attosecond X-ray pulses from the FEL

    E-Print Network [OSTI]

    Zholents, Alexander A.; Fawley, William M.

    2004-01-01

    can be used instead of HC FEL. In the following illustra-UM is now tuned for resonant FEL interaction with the 32-nmAttosecond X-Ray Pulses from the FEL Alexander A. Zholents,

  15. RADIO FREQUENCY PHASE IN THE FEL SECTION OF A TBA

    E-Print Network [OSTI]

    Kuenning, R.W.

    2008-01-01

    and A. M. Sessler. "A Steady-State FEL: Particle Dynamicsin the FEL Portion of a Two-Beam Accelerator," Proc. of 7thand Amplitude Studies of an FEL: Steady State. lD. Resonant

  16. FEL GAIN LENGTH AND TAPER MEASUREMENTS AT LCLS

    E-Print Network [OSTI]

    Ratner, D.

    2010-01-01

    more than double the coherent, FEL power over the satura-FEL GAIN LENGTH AND TAPER MEASUREMENTS AT LCLS ? D.Figure 11: Post-saturation FEL pulse energy for a taper with

  17. Start-Up of FEL Oscillator from Shot Noise

    E-Print Network [OSTI]

    Kumar, V.; Krishnagopal, S.; Fawley, W.M.

    2007-01-01

    of start-up of the CUTE-FEL oscillator from shot noiseof passes required for the FEL to saturate is equivalent toSTART-UP OF FEL OSCILLATOR FROM SHOT NOISE V. Kumar ? , S.

  18. Single shot polarization characterization of XUV FEL pulses from crossed polarized undulators

    DOE Public Access Gateway for Energy & Science Beta (PAGES Beta)

    Ferrari, E.; Allaria, E.; Buck, J.; De Ninno, G.; Diviacco, B.; Gauthier, D.; Giannessi, L.; Glaser, L.; Huang, Z.; Ilchen, M.; et al

    2015-08-28

    Polarization control is a key feature of light generated by short-wavelength free-electron lasers. In this work, we report the first experimental characterization of the polarization properties of an extreme ultraviolet high gain free-electron laser operated with crossed polarized undulators. We research the average degree of polarization and the shot-to-shot stability and we analyze aspects such as existing possibilities for controlling and switching the polarization state of the emitted light. The results are in agreement with predictions based on Gaussian beams propagation.

  19. Excitements and Challenges for Future Light Sources Based on X-Ray FELs

    E-Print Network [OSTI]

    -ray Laser Laboratory #12;LLINACINAC CCOHERENTOHERENT LLIGHTIGHT SSOURCEOURCE 2 Km 0 Km 3 Km #12;LCLS brightness of the LCLS and other facilities operating or under construction LEUTL TTF FEL LCLS Spontaneous)(B. Faatz) UCLAUCLA #12;LCLS - The First Experiments Team Leaders: AbsorptionResonanceRaman t0 t1 t2 t3 t4 t

  20. Beam Dynamics Study of X-Band Linac Driven X-Ray FELS

    SciTech Connect (OSTI)

    Adolphsen, C.; Limborg-Deprey, C.; Raubenheimer, T.O.; Wu, J.; /SLAC; Sun, Y.; /SLAC

    2011-12-13

    Several linac driven X-ray Free Electron Lasers (XFELs) are being developed to provide high brightness photon beams with very short, tunable wavelengths. In this paper, three XFEL configurations are proposed that achieve LCLS-like performance using X-band linac drivers. These linacs are more versatile, efficient and compact than ones using S-band or C-band rf technology. For each of the designs, the overall accelerator layout and the shaping of the bunch longitudinal phase space are described briefly. During the last 40 years, the photon wavelengths from linac driven FELs have been pushed shorter by increasing the electron beam energy and adopting shorter period undulators. Recently, the wavelengths have reached the X-ray range, with FLASH (Free-Electron Laser in Hamburg) and LCLS (Linac Coherent Light Source) successfully providing users with soft and hard X-rays, respectively. FLASH uses a 1.2 GeV L-band (1.3 GHz) superconducting linac driver and can deliver 10-70 fs FWHM long photon pulses in a wavelength range of 44 nm to 4.1 nm. LCLS uses the last third of the SLAC 3 km S-band (2.856 GHz) normal-conducting linac to produce 3.5 GeV to 15 GeV bunches to generate soft and hard X-rays with good spatial coherence at wavelengths from 2.2 nm to 0.12 nm. Newer XFELs (at Spring8 and PSI) use C-band (5.7 GHz) normal-conducting linac drivers, which can sustain higher acceleration gradients, and hence shorten the linac length, and are more efficient at converting rf energy to bunch energy. The X-band (11.4 GHz) rf technology developed for NLC/GLC offers even higher gradients and efficiencies, and the shorter rf wavelength allows more versatility in longitudinal bunch phase space compression and manipulation. In the following sections, three different configurations of X-band linac driven XFELs are described that operate from 6 to 14 GeV. The first (LOW CHARGE DESIGN) has an electron bunch charge of only 10 pC; the second (OPTICS LINEARIZATION DESIGN) is based on optics linearization of the longitudinal phase space in the first stage bunch compressor and can operate with either a high (250 pC) or low (20 pC) bunch charge; and the third (LCLS INJECTOR DESIGN) is similar to LCLS but uses an X-band linac after the first stage bunch compressor at 250 MeV to achieve a final beam energy up to 14 GeV. Compared with LCLS, these X-band linacs are at least a factor of three shorter.

  1. Procedures for Experiments (PFX)

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

    Lab currently supports research in two broad areas of scientific investigation, the Nuclear Physics program and the Free-Electron Laser (FEL) program. Each program has its...

  2. Nuclear Physics: Experiment Research - Call for Beam Time Requests

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

    Free-Electron Laser (FEL) Medical Imaging Physics Topics Campaigns Meetings Recent Talks Archived Talks Additional Information Computing at JLab Operations Logbook Beam Time...

  3. Nuclear Physics: Experiment Research

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

    Free Electron Laser (FEL) Medical Imaging Physics Topics Campaigns Meetings Recent Talks Archived Talks Additional Information Computing at JLab Operations Logbook Experiment...

  4. Nuclear Physics: Recent Talks

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

    Free Electron Laser (FEL) Medical Imaging Physics Topics Campaigns Meetings Recent Talks Archived Talks Additional Information Computing at JLab Operations Logbook Physics Topics:...

  5. Nuclear Physics: Campaigns

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

    Free-Electron Laser (FEL) Medical Imaging Physics Topics Campaigns The Structure of the Nuclear Building Blocks The Structure of Nuclei Symmetry Tests in Nuclear Physics Meetings...

  6. Nuclear Physics: Archived Talks - Accelerator

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

    Free Electron Laser (FEL) Medical Imaging Physics Topics Campaigns Meetings Recent Talks Archived Talks Accelerator Hall A Hall B Hall C 12 GeV Upgrade Experimental Techniques...

  7. Development of a new generation of optical slope measuring profiler

    E-Print Network [OSTI]

    Yashchuk, Valeriy V.

    2010-01-01

    Free Electron Laser (FEL), LCLS, National Synchrotron Light1-3]. The beamlines for LCLS, NSLS-II, and planned upgrade

  8. Nuclear Physics: Experiment Research

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

    Research Highlights Public Interest Nuclear Physics Accelerator Free Electron Laser (FEL) Medical Imaging Physics Topics Campaigns Meetings Recent Talks Archived Talks...

  9. TURKISH ACCELERATOR COMPLEX & STATUS OF TAC SASE FEL

    E-Print Network [OSTI]

    TURKISH ACCELERATOR COMPLEX & STATUS OF TAC SASE FEL Dr. Hatice DURAN YILDIZ On the Behalf of the TAC & TAC SASE-FEL Group DESY April 5, 2011 #12;2 Content Aim & Phases of the TAC Project TAC-TARLA Facility TARLA Resonator System TAC SASE-FEL Group Members & Duties TAC SASE-FEL Tentative Parameters

  10. Energy of the Quasi-free Electron in Argon and Krypton C. M. Evans1,

    E-Print Network [OSTI]

    Findley, Gary L.

    Energy of the Quasi-free Electron in Argon and Krypton C. M. Evans1, and G. L. Findley2, 1 these data, a new local Wigner- Seitz model for the density dependent energy V0(P) of a quasi-free electron/medium polarization energy, and includes the thermal kinetic energy of the quasi-free electron. Using this model, V0(P

  11. Production of Ultrashort FEL XUV Pulses via a Reverse Undulator Taper

    E-Print Network [OSTI]

    Fawley, William M.

    2007-01-01

    Production of Ultrashort FEL XUV Pulses via a Reverseof 2009. In recent years, FEL researchers have explored ara- diator undulators, the FEL emission will predomi- nately

  12. MEASURING FEL RADIATION PROPERTIES AT VISA-FEL A. Murokh*, R...

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

    observed at 840 nm. We describe here the diagnostic system, experimental procedures and data reduction algorithms, as the FEL performance was measured along the length of the...

  13. CRC handbook of laser science and technology. Volume 1. Lasers and masers

    SciTech Connect (OSTI)

    Weber, M.J.

    1982-01-01

    This book describes various types of lasers and masers. The following topics are discussed in detail: types and comparisons of laser sources, crystal and glass lasers, semiconductor lasers, organic dye and other liquid lasers, free-electron and x-ray lasers, masers and laser safety.

  14. Comment to the paper: 'Seeded quantum FEL at 478 keV' AIP Conf. Proc. 'Light at Extreme Intensities' 1462 173-176 (2012)'

    E-Print Network [OSTI]

    Vittoria Petrillo

    2012-12-19

    We criticize the thesis exposed the paper 'Seeded quantum FEL at 478 keV' AIP Conf. Proc. 'Light at Extreme Intensities,' 1462 173-176 (2012), which presents the possibility of producing gamma rays at 478 KeV by means of a seeded quantum FEL driven by an electron beam at 125 MeV, current I=40 A, interacting with an infrared laser. We show that, in the case analyzed, the FEL Pierce parameter has a value two orders of magnitude less than what claimed in the paper in question, overturning the conclusions of the analysis.

  15. Parameter Selection and Longitudinal Phase Space Simulation for a Single Stage X-Band FEL Driver at 250 MeV

    SciTech Connect (OSTI)

    Sun, Yipeng; Raubenheimer, Tor; Wu, Juhao; ,

    2011-08-19

    Hard x-ray Free electron lasers (FEL) are being built or proposed at many accelerator laboratories as it supports wide range of applications in many aspects. Most of the hard x-ray FEL design is similar with the SLAC Linac Coherent Light Source (LCLS), which features a two (or multiple) stage bunch compression. For the first stage of the bunch compression, usually the beam is accelerated in a lower-frequency RF section (such as S-band for LCLS), and then the longitudinal phase space is linearized by a higher-frequency RF section (harmonic RF, such as X-band for LCLS). In this paper, a compact hard x-ray FEL design is proposed, which is based on X-band RF acceleration and eliminating the need of a harmonic RF. The parameter selection and relation is discussed, and the longitudinal phase space simulation is presented. The FEL coherence condition of the electron beam in the undulators requires a large charge density, a small emittance and small energy spread. The RMS electron bunch length from the injector is in the ps scale, with a bunch charge in the range of hundreds pC to several nC, which means that the current is roughly 0.1 kA. According to the requirement from soft x-ray lasing and hard x-ray lasing, a peak current of 1 kA and 3 kA is needed respectively. Thus the bunch has to be compressed. Usually a two stage bunch compression or multipole stage bunch compression is adopted. The z-correlated energy chirp is normally established by letting the beam pass through a section of RF cavities, with a RF phase off crest. As stated above, S-band RF (3 GHz) acceleration could be applied in this section. Due to the nature of RF acceleration wave, the chirp on the bunch is not linear, but has the RF curvature on it. In order to linearize the energy chirp, a harmonic RF section with higher frequency is needed. For LCLS a short X-band RF section (12 GHz) is used which is a fourth order harmonic. The linearized bunch is then passing by a dispersive region, in which the particles with different energy have different path length. A four dipole chicane is the natural choice for the dispersive region. As the example illustrated in Figure 1, the head of the bunch has smaller energy, and gets a stronger bending kick from the dipole magnet, then has a longer path length in the dispersive region. Similarly, the tail of the bunch has larger energy and shorter path length in the dispersive region. At the exit of the dispersive region, the relative longitudinal position of the head and tail of the bunch both move to the center of the bunch, so the bunch length will be shorter.

  16. Compact X-ray Free Electron Laser from a Laser-plasma Accelerator using a

    Office of Scientific and Technical Information (OSTI)

    AFDC Printable Version Share this resource Send a link to EERE: Alternative Fuels Data Center Home Page to someone by E-mail Share EERE: Alternative Fuels Data Center Home Page on Facebook Tweet about EERE: Alternative Fuels Data Center Home Page on Twitter Bookmark EERE: Alternative Fuels Data Center Homesum_a_epg0_fpd_mmcf_m.xls" ,"Available from WebQuantity of NaturalDukeWakefield MunicipalTechnical Report: Achievements ofCOMPOSITION OF VAPORS FROMSciDACReport) |Transverse Gradient

  17. Compact X-ray Free Electron Laser from a Laser-plasma Accelerator using a

    Office of Scientific and Technical Information (OSTI)

    AFDC Printable Version Share this resource Send a link to EERE: Alternative Fuels Data Center Home Page to someone by E-mail Share EERE: Alternative Fuels Data Center Home Page on Facebook Tweet about EERE: Alternative Fuels Data Center Home Page on Twitter Bookmark EERE: Alternative Fuels Data Center Homesum_a_epg0_fpd_mmcf_m.xls" ,"Available from WebQuantity of NaturalDukeWakefieldSulfate Reducing BacteriaConnect Collider Tests of the LittleJournal Article:in

  18. Compact X-ray Free-Electron Laser from a Laser-Plasma Accelerator Using a

    Office of Scientific and Technical Information (OSTI)

    AFDC Printable Version Share this resource Send a link to EERE: Alternative Fuels Data Center Home Page to someone by E-mail Share EERE: Alternative Fuels Data Center Home Page on Facebook Tweet about EERE: Alternative Fuels Data Center Home Page on Twitter Bookmark EERE: Alternative Fuels Data Center Homesum_a_epg0_fpd_mmcf_m.xls" ,"Available from WebQuantity of NaturalDukeWakefieldSulfate Reducing BacteriaConnect Collider Tests of the LittleJournal Article:inTransverse-Gradient

  19. Compact x-ray free electron laser from a laser-plasma accelerator using a

    Office of Scientific and Technical Information (OSTI)

    AFDC Printable Version Share this resource Send a link to EERE: Alternative Fuels Data Center Home Page to someone by E-mail Share EERE: Alternative Fuels Data Center Home Page on Facebook Tweet about EERE: Alternative Fuels Data Center Home Page on Twitter Bookmark EERE: Alternative Fuels Data Center Homesum_a_epg0_fpd_mmcf_m.xls" ,"Available from WebQuantity of NaturalDukeWakefieldSulfate Reducing BacteriaConnect Collider Tests of the LittleJournal

  20. Compact x-ray free electron laser from a laser-plasma accelerator using a

    Office of Scientific and Technical Information (OSTI)

    AFDC Printable Version Share this resource Send a link to EERE: Alternative Fuels Data Center Home Page to someone by E-mail Share EERE: Alternative Fuels Data Center Home Page on Facebook Tweet about EERE: Alternative Fuels Data Center Home Page on Twitter Bookmark EERE: Alternative Fuels Data Center Homesum_a_epg0_fpd_mmcf_m.xls" ,"Available from WebQuantity of NaturalDukeWakefieldSulfate Reducing BacteriaConnect Collider Tests of the LittleJournaltransverse gradient undulator

  1. Latest developments on the Dutch 1MW free electron maser

    SciTech Connect (OSTI)

    Caplan, M. [Lawrence Livermore National Laboratory, 7000 East Ave, L-637 Livermore California, 94551 (United States); Verhoeven, A.G.; Urbanus, W. [FOM Instituut voor Plasma Fysica, Rijnhuizen, P.O. Box 1207, 3430 BE Nieuwegein (The Netherlands)

    1999-05-01

    The FOM Institute (Rijnhuizen, Netherlands), as part of their fusion technology program, has undertaken the development of a Free Electron Maser with the goal of producing 1MW long pulse to CW microwave output in the range 130 GHz{endash}250GHz with wall plug efficiencies of 60{percent}. This project has been carried out as a collaborative effort with Institute of Applied Physics, Nizhny Novgorod Russia, Kurchatov Institute, Moscow Russia, Lawrence Livermore Laboratory, U.S.A and CPI, U.S.A. The key design features of this FEM consists first of a conventional DC acceleration system at high voltage (2MV) which supplies only the unwanted beam interception current and a depressed collector system at 250kV which provides the main beam power. Low body current interception ({lt}25mA) is ensured by using robust inline beam focussing, a low emittance electron gun with halo suppression and periodic magnet side array focussing in the wiggler. The second key feature is use of a low-loss step corrugated waveguide circuit for broad band CW power handling and beam/RF separation. Finally, the required interaction efficiency and mode control is provided by a two stage stepped wiggler. The FEM has been constructed and recently undergone initial short pulse ({lt}10 usec) testing in an inverted mode with the depressed collector absent. Results to date have demonstrated 98.8{percent} beam transmission (over 5 Meters) at currents as high as 8.4 Amps, with 200GHz microwave output at 700kW. There has been good agreement between theory and experiment at the beam current levels tested so far. Details of the most recent experimental results will be presented, in particular the output frequency characteristics with detailed comparisons to theory. The immediate future plans are to operate the system at the design value of 12 Amps with at least 1MW output. The system will then be reconfigured with a 3 stage depressed collector to demonstrate, in the next year, long pulse operation (100 msec) and high wall plug efficiency. Long term future plans call for upgrading the FEM to 2MW and extrapolations up to 5MW are shown to be theoretically possible. {copyright} {ital 1999 American Institute of Physics.}

  2. Front End Loading (FEL) and Process Engineering Workflow

    E-Print Network [OSTI]

    Spangler, Ryan

    2005-05-20

    review of past projects, and develop a comprehensive list of "standard" FEL deliverables. Once these deliverables were defined, a review of engineering workflow activities for each stage of the FEL process was performed. The list of deliverables...

  3. Investigation of a 2-Colour Undulator FEL Using Puffin

    E-Print Network [OSTI]

    Campbell, L T; Reiche, S

    2013-01-01

    Initial studies of a 2-colour FEL amplifier using one monoenergetic electron beam are presented. The interaction is modelled using the unaveraged, broadband FEL code Puffin. A series of undulator modules are tuned to generate two resonant frequencies along the FEL interaction and a self-consistent 2-colour FEL interaction at widely spaced non-harmonic wavelengths at 1nm and 2.4nm is demonstrated.

  4. 17 August 2000 FEL 2000 1 Radiation Induced by Relativistic

    E-Print Network [OSTI]

    17 August 2000 FEL 2000 1 Radiation Induced by Relativistic Beams Passing Over a Diffraction 2000 FEL 2000 2 Outline · Spontaneous Smith-Purcell radiation (SPR) can be intense. · Data from the ATF. #12;17 August 2000 FEL 2000 3 Smith-Purcell radiation q v b Dispersion relation: l n c vl cos 1 cosn

  5. FEL3330 Networked and Multi-Agent Control Spring 2011

    E-Print Network [OSTI]

    Dimarogonas, Dimos

    FEL3330 Networked and Multi-Agent Control Systems Spring 2011 Automatic Control School of Electrical Engineering Royal Institute of Technology Lecture 1 1 March 29, 2011 #12;FEL3330 Networked Lecture 1 3 March 29, 2011 #12;FEL3330 Networked and Multi-Agent Control Systems Lecture 1: Introduction

  6. Energy of the Quasi-free Electron in Supercritical Krypton near the Critical Point Luxi Li and C. M. Evans

    E-Print Network [OSTI]

    Findley, Gary L.

    Energy of the Quasi-free Electron in Supercritical Krypton near the Critical Point Luxi Li and C. M by the quasi-free electron that arises from field ionization of the dopant, and the zero point kinetic energy of the free electron. The overall decrease in the shift of the dopant ionization energy near the critical

  7. Energy of the quasi-free electron in supercritical argon near the critical point C.M. Evans1,

    E-Print Network [OSTI]

    Findley, Gary L.

    Energy of the quasi-free electron in supercritical argon near the critical point C.M. Evans1 to the interaction between argon and the quasi-free electron arising from field ionization of the dopant. The energy by the ionic core, V0(P) is the quasi-free electron energy in the perturbing medium, and P is the perturber

  8. X-FEL Report 2004-04 DSP Integrated, Parameterized, FPGA Based

    E-Print Network [OSTI]

    X-FEL Report 2004-04 DSP Integrated, Parameterized, FPGA Based Cavity Simulator & Controller for UV-FEL and X-Ray FEL). The controller bases on a programmable circuit Xilinx VirtexII V3000 embedded on a PCB, VHDL, FEL, TESLA, TTF, UV-FEL, Xilinx, FPGA based systems, LLRF control system of third generation

  9. COMMISSIONING OF THE VUV-FEL INJECTOR AT TTF S. Schreiber

    E-Print Network [OSTI]

    COMMISSIONING OF THE VUV-FEL INJECTOR AT TTF S. Schreiber , DESY, Hamburg, Germany for the VUV-FEL group Abstract The VUV-FEL at the TESLA Test Facility (TTF) at DESY is being upgraded to an FEL user project of the TESLA collaboration at present is the VUV-FEL at the TESLA Test Facility (TTF) at DESY[1

  10. Modeling of free electronic state density in hydrogenic plasmas based on nearest neighbor approximation

    SciTech Connect (OSTI)

    Nishikawa, Takeshi

    2014-07-15

    Most conventional atomic models in a plasma do not treat the effect of the plasma on the free-electron state density. Using a nearest neighbor approximation, the state densities in hydrogenic plasmas for both bound and free electrons were evaluated and the effect of the plasma on the atomic model (especially for the state density of the free electron) was studied. The model evaluates the electron-state densities using the potential distribution formed by the superposition of the Coulomb potentials of two ions. The potential from one ion perturbs the electronic state density on the other. Using this new model, one can evaluate the free-state density without making any ad-hoc assumptions. The resulting contours of the average ionization degree, given as a function of the plasma temperature and density, are shifted slightly to lower temperatures because of the effect of the increasing free-state density.

  11. GINGER simulations of short-pulse effects in the LEUTL FEL

    E-Print Network [OSTI]

    Huang, Z.; Fawley, W.M.

    2001-01-01

    with Þ in a high-gain FEL. GINGER does not presently modelcontribution in the LEUTL FEL. However, for a true GaussianSHORT-PULSE EFFECTS IN THE LEUTL FEL £ Z. Huang Ý , Advanced

  12. A Study of Phase Control in the FEL Two-Beam Accelerator

    E-Print Network [OSTI]

    Sessler, Andrew M.

    2008-01-01

    Study of Phase Control in the FEL Two-Beam Accelerator A.M.OF PHASE CONTROL IN THE FEL TWO-BEAM ACCELERATOR* ANDREW M.OF PHASE CONTROL IN THE FEL TWO-BEAM ACCELERATOR Andrew M.

  13. Oscillator Seeding of a High Gain Harmonic Generation FEL in a Radiator-First Configuration

    E-Print Network [OSTI]

    Gandhi, P.

    2014-01-01

    Proceedings of the 2010 FEL Conference, Malm¨o, Sweden,Proceedings of the 2010 FEL Conference, Malm¨o, Sweden,of a high gain harmonic generation FEL in a radiator-first

  14. Performance of Hole-Coupling Resonator in the Presence of Asymmetric Modes and FEL Gain

    E-Print Network [OSTI]

    Xie, M.

    2011-01-01

    is derived in, K. -1. Kim, "FEL Gain Taking into Accountof Asymmetric Modes :1nd FEL Gain M. Xie and K. -J. KimOF ASYMMETRIC MODES AND FEL GAIN· Ming Xie and Kwang-Je Kim

  15. Technical Design and Optimization Study for the FERMI@Elettra FEL Photoinjector

    E-Print Network [OSTI]

    Lidia, Steven M.; Penco, Giuseppe; Trovo', Mauro

    2006-01-01

    Source for the ELETTRA Linac FEL”, ST/M-03/02, May 2003. [for the FERMI @ Elettra FEL”, Proceedings of the 27 thStudy for the FERMI@Elettra FEL Photoinjector Steve Lidia (

  16. Studies of a Linac Driver for a High Repetition Rate X-Ray FEL

    E-Print Network [OSTI]

    Venturini, M.

    2012-01-01

    REPETITION RATE X-RAY FEL ? M. Venturini † , J. Corlett, L.support a high repetition rate FEL operating in the soft x-of high-repetition rate FEL machine generat- ing soft x-rays

  17. Suppression of Mode-Beating in a Saturated Hole-Coupling FEL Oscillator

    E-Print Network [OSTI]

    Krishnagopal, S.

    2011-01-01

    cavity case L and with an FEL interaction. of mode-beatingMode profiles (with an FEL interaction) at three differentin a Saturated Hole-coupled FEL Oscillator S. Krishnagopal,

  18. Novel Techniques for Single-Pulse Spectrum and Pulsewidth Measurements for an IR-FEL

    E-Print Network [OSTI]

    Leemans, W.P.

    2011-01-01

    ofthe LBL/Stanford diagnostics. FEL Thespectral andtemporalMeasurements for an IR-FEL W.P. Leemans, J.A. Edighoffer, K-Measurements for an IR-FEL* W. P. Leemans, J. A. Edighoffer,

  19. Design study of the bending sections between harmonic cascade FEL stages

    E-Print Network [OSTI]

    Wan, Weishi; Corlett, John; Fawley, William; Zholents, A.

    2004-01-01

    A XUV/Soft X-Ray Harmonic- Cascade FEL for the Proposed LBNLin a Cascaded Harmonic FEL CBP Tech Note-281, Februarybetween Harmonic Cascade FEL Stages W. Wan, J. Corlett, W.

  20. A HIGH REPETITION RATE VUV-SOFT X-RAY FEL CONCEPT

    E-Print Network [OSTI]

    2007-01-01

    performance, based on a number of FEL configurations, fed byREPETITION RATE VUV-SOFT X-RAY FEL CONCEPT* J. Corlett # ,will be switched into each FEL in the array, in a time-

  1. Some issues and subtleties in numerical simulation of X-ray FEL's

    E-Print Network [OSTI]

    Fawley, William M.

    2002-01-01

    ed Spontaneous Emission FEL”, submitted to Phys. Rev, 2002;V. Litvinenko, “Macroparticle FEL Model with Self-ConsistentInitial Stage of a SASE FEL”, Poster MO-P-15, these proceed-

  2. Design Studies for a High-Repetition-Rate FEL Facility at LBNL.

    E-Print Network [OSTI]

    CORLETT, J.

    2009-01-01

    for a High-Repetition-Rate FEL Facility at LBNL* A. Brepetition-rate, seeded FEL. Figure 2: Longitudinal phase-spontaneous emission FEL with energy-chirped electron beam

  3. The Standing Wave FEL/TBA: Realistic Cavity Geometry and Energy Extraction

    E-Print Network [OSTI]

    Kim, J.S.

    2008-01-01

    the Proceedings The Standing Wave FEL/TBA: Realistic CavityAC03- 76SF00098 The Standing Wave FEL/TBA: Realistic Cavitythe conventional wiggle-averaged FEL equations[6]. Using the

  4. FULL ELECTROMAGNETIC FEL SIMULATION VIA THE LORENTZ-BOOSTED FRAME TRANSFORMATION

    E-Print Network [OSTI]

    Fawley, William

    2010-01-01

    FULL ELECTROMAGNETIC FEL SIMULATION VIA THE LORENTZ-BOOSTEDrest frame), the red-shifted FEL radiation and blue-shiftedper- mit direct study of FEL problems for which the eikonal

  5. Three-Dimensional Simulation of a Hole-Coupled FEL Oscillator

    E-Print Network [OSTI]

    Krishnagopal, S.

    2008-01-01

    resonator in the presence of FEL gain, M.Xie and K. -J.Kim,Simulation of a Hole-Coupled FEL Oscillator S. KrishnagopalSimulation of a Hole-Coupled FEL Oscillator S. Krishnagopal,

  6. Technique for the Generation of Attosecond X-Ray Pulses Using an FEL

    E-Print Network [OSTI]

    Penn, G.; Zholents, A.A.

    2005-01-01

    experiments at a X-ray SASE FEL”, Optics Communications,considerations for a SASE X-ray FEL”, Nucl. Instr. Methodsa fully 3D time-dependent FEL simulation code”, Nucl. Instr.

  7. FEL Gain Taking into Account Diffraction and Electron Beam Emittance; Generalized Madey's Theorem

    E-Print Network [OSTI]

    Kim, K.-J.

    2011-01-01

    be published in the Proceedings FEL Gain Taking into AccountLBL--30628 DE92 002262 FEL Gain Taking into Accountfunction SF contains the FEL dynamics, and will be regarded

  8. Connecting Lab-Based Attosecond Science with FEL research

    ScienceCinema (OSTI)

    None

    2011-10-06

    In the last few years laboratory-scale femtosecond laser-based research using XUV light has developed dramatically following the successful development of attosecond laser pulses by means of high-harmonic generation. Using attosecond laser pulses, studies of electron dynamics on the natural timescale that electronic processes occur in atoms, molecules and solids can be contemplated, providing unprecedented insight into the fundamental role that electrons play in photo-induced processes. In my talk I will briefly review the present status of the attosecond science research field in terms of present and foreseen capabilities, and discuss a few recent applications, including a first example of the use of attosecond laser pulses in molecular science. In addition, I will discuss very recent results of experiments where photoionization of dynamically aligned molecules is investigated using a high-harmonics XUV source. Photoionization of aligned molecules becomes all the more interesting if the experiment is performed using x-ray photons. Following the absorption of x-rays, ejected photoelectrons can be used as a probe of the (time-evolving) molecular structure, making use of intra-molecular electron diffraction. This amounts, as some have stated, to ?illuminating the molecule from within?. I will present the present status of our experiments on this topic making use of the FLASH free electron laser in Hamburg. Future progress in this research field not only depends on the availability of better and more powerful light sources, but also requires sophisticated detector strategies. In my talk I will explain how we are trying to meet some of the experimental challenges by using the Medipix family of detectors, which we have already used for time- and space-resolved imaging of electrons and ions.

  9. Generating polarization controllable FELs at Dalian coherent light source

    E-Print Network [OSTI]

    Zhang, T; Wang, D; Zhao, Z T; Zhang, W Q; Wu, G R; Dai, D X; Yang, X M

    2013-01-01

    The property of the FEL polarization is of great importance to the user community. FEL pulses with ultra-high intensity and flexible polarization control ability will absolutely open up new scientific realms. In this paper, several polarization control approaches are presented to investigate the great potential on Dalian coherent light source, which is a government-approved novel FEL user facility with the capability of wavelength continuously tunable in the EUV regime of 50-150 nm. The numerical simulations show that both circularly polarized FELs with highly modulating frequency and 100 microjoule level pulse energy could be generated at Dalian coherent light source.

  10. Instrumentation and Diagnostics for High Repetition Rate LINAC-Driven FEL

    E-Print Network [OSTI]

    De Santis, S

    2014-01-01

    Evtushenko, “Electron Beam Diagnostics For High Current FELDrivers”, FEL 2011, Shanghai (2011). [5] F. Sannibale, etREPETITION RATE LINAC-DRIVEN FEL S. De Santis # , J. Byrd,

  11. Measurements of nonlinear harmonic generation at the Advanced Photon Source's SASE FEL

    E-Print Network [OSTI]

    2002-01-01

    the Advanced Photon Source's SASE FEL* S.G. Biedron* , R.J.Visible to Infrared SASE FEL) experiment at B N L [19]. II.

  12. Comments on : Proposal for Raman x-ray free electron laser.

    SciTech Connect (OSTI)

    Zholents, A.; Zolotorev, M. (Accelerator Systems Division (APS)); (LBNL)

    2011-05-01

    Equation 13 in this paper defines the force experienced by the electron moving in z direction with velocity v{sub z} due to the X-ray wave propagating in z direction with electric field E{sub 1} pointing in y direction and magnetic field B{sub 1} pointing in x direction as {rvec F}{sub 1}(t) = -eE{sub 1} cos({omega}{sub 1}t - k{sub 1}z){rvec e}{sub y}. In our opinion calculating this force one should also include the impact of the X-ray wave's magnetic field and obtain {rvec F}{sub 1}(t) = -e E{sub 1} = v{sub z}/c B{sub 1} cos({omega}{sub 1}t - k{sub 1}z){rvec e}{sub y} {approx} - eE{sub 1}/2{gamma}{sup 2} cos({omega}{sub 1}t - k{sub 1}z){rvec e}{sub y}. Here c is the speed of light and {gamma} is the electron relativistic factor. In result one would need to change E{sub 1} to E{sub 1}/2{gamma}{sup 2} in all the following equations in the cited paper (except wave propagation equations, Eqs. (23) and (34)). They believe that similar omission in the impact of the magnetic field appears in equation (28). Consequently, the formula for the gaion (Eq. (37) in the cited paper) should also include the factor 1/2{gamma}{sup 2}. This is a rather significant modification considering that relativistic electrons with values of {gamma} ranging from approximately 20 to approximately 300 are used in the numerical examples.

  13. Inverse Free Electron Laser Interactions with Sub-Picosecond High Brightness Electron Beams

    E-Print Network [OSTI]

    Moody, Joshua Timothy

    2014-01-01

    Accelerated Electron Beam Spectrum . . . . . . . . . . . .2 High Brightness Electron Beams Produced in thetion of Uniformly Filled Ellipsoidal Electron Beam: Method-

  14. Cyclotron-undulator cooling of a free-electron-laser beam

    SciTech Connect (OSTI)

    Bandurkin, I. V.; Kuzikov, S. V. [Institute of Applied Physics, Russian Academy of Sciences, Nizhny Novgorod (Russian Federation); Savilov, A. V. [Institute of Applied Physics, Russian Academy of Sciences, Nizhny Novgorod (Russian Federation); Lobachevsky State University of Nizhny Novgorod, Nizhny Novgorod (Russian Federation)

    2014-08-18

    We propose methods of fast cooling of an electron beam, which are based on wiggling of particles in an undulator in the presence of an axial magnetic field. We use a strong dependence of the axial electron velocity on the oscillatory velocity, when the electron cyclotron frequency is close to the frequency of electron wiggling in the undulator field. The abnormal character of this dependence (when the oscillatory velocity increases with the increase of the input axial velocity) can be a basis of various methods for fast cooling of moderately relativistic (several MeV) electron beams.

  15. Three-dimensional theory of Smith-Purcell free-electron laser with dielectric loaded grating

    SciTech Connect (OSTI)

    Cao, Miaomiao, E-mail: mona486@yeah.net; Li, Ke, E-mail: like3714@163.com [Key Laboratory of High Power Microwave Sources and Technologies, Institute of Electronics, Chinese Academy of Sciences, Beijing 100190 (China); University of Chinese Academy of Sciences, School of Electronic Science and Technology, Beijing 100049 (China); Liu, Wenxin, E-mail: lwenxin@mail.ie.ac.cn; Wang, Yong, E-mail: wangyong3845@sina.com [Key Laboratory of High Power Microwave Sources and Technologies, Institute of Electronics, Chinese Academy of Sciences, Beijing 100190 (China)

    2014-09-14

    A dielectric loaded rectangular grating for Smith-Purcell devices is proposed in this paper. Regarding the electron beam as a moving plasma dielectric, a three dimensional (3D) linear theory of beam-wave interaction is developed. The first and second order growth rates are calculated, which are obtained by expanding hot dispersion equation at synchronous point. The results show that the cutoff frequency is affected by grating width. The dispersion curve becomes flatter and shifts towards lower frequency by loading dielectric in grooves. The simulation results, which are obtained by a 3D particle-in-cell code, are in good agreement with theoretical calculations. Compared the first and second order growth rate, it shows that the discrepancy is large when beam parameters are selected with high values. In this case, it is necessary to apply the second order growth rate, which can accurately describe the process of beam-wave interaction.

  16. Accurate macromolecular structures using minimal measurements from X-ray free-electron lasers

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

    Hattne, Hattne

    Diffraction patterns from thermolysin microcrystals and one dark run, collected in December 2011. This data was used for metrology calibration and general cctbx.xfel development.

  17. A high thermal conductivity waveguide window for use in a free electron laser

    SciTech Connect (OSTI)

    T. Elliott; V. Nguyen; L. Phillips; J. Preble (Jefferson Lab); T. Schultheiss; V. Christina; M. Cole; J. Rathke (Northrop Grumman Corp.)

    1999-04-01

    Design, analysis, and testing of a waveguide window with a goal of propagating greater than 100 kW average power operating at 1500 Mhz has been performed. This is made possible by the favorable material properties of beryllia (BeO). Brazing the window to a soft copper frame and then brazing the frame to a KOVAR flange provides the vacuum seal. RF analysis combined with thermal/structural analysis shows the benefits of the material. The KOVAR flange with a CTE, coefficient of thermal expansion, that matches that of BeO enables a strong braze joint. RF testing to 35 kW has been successful. The basics of this design can be expanded to applications with lower frequencies and higher average power. A paper similar to this was presented at LINAC 98.

  18. Accurate macromolecular structures using minimal measurements from X-ray free-electron lasers

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

    Hattne, Hattne

    2014-03-04

    Diffraction patterns from thermolysin microcrystals and one dark run, collected in December 2011. This data was used for metrology calibration and general cctbx.xfel development.

  19. Goniometer-based femtosecond crystallography with X-ray free electron lasers

    SciTech Connect (OSTI)

    Cohen, Aina E.; Soltis, S. Michael; González, Ana; Aguila, Laura; Alonso-Mori, Roberto; Barnes, Christopher O.; Baxter, Elizabeth L.; Brehmer, Winnie; Brewster, Aaron S.; Brunger, Axel T.; Calero, Guillermo; Chang, Joseph F.; Chollet, Matthieu; Ehrensberger, Paul; Eriksson, Thomas L.; Feng, Yiping; Hattne, Johan; Hedman, Britt; Hollenbeck, Michael; Holton, James M.; Keable, Stephen; Kobilka, Brian K.; Kovaleva, Elena G.; Kruse, Andrew C.; Lemke, Henrik T.; Lin, Guowu; Lyubimov, Artem Y.; Manglik, Aashish; Mathews, Irimpan I.; McPhillips, Scott E.; Nelson, Silke; Peters, John W.; Sauter, Nicholas K.; Smith, Clyde A.; Song, Jinhu; Stevenson, Hilary P.; Tsai, Yingssu; Uervirojnangkoorn, Monarin; Vinetsky, Vladimir; Wakatsuki, Soichi; Weis, William I.; Zadvornyy, Oleg A.; Zeldin, Oliver B.; Zhu, Diling; Hodgson, Keith O.

    2014-10-31

    The emerging method of femtosecond crystallography (FX) may extend the diffraction resolution accessible from small radiation-sensitive crystals and provides a means to determine catalytically accurate structures of acutely radiation-sensitive metalloenzymes. Automated goniometer-based instrumentation developed for use at the Linac Coherent Light Source enabled efficient and flexible FX experiments to be performed on a variety of sample types. In the case of rod-shaped Cpl hydrogenase crystals, only five crystals and about 30 min of beam time were used to obtain the 125 still diffraction patterns used to produce a 1.6-Å resolution electron density map. With smaller crystals, high-density grids were used to increase sample throughput; 930 myoglobin crystals mounted at random orientation inside 32 grids were exposed, demonstrating the utility of this approach. Screening results from cryocooled crystals of ?2-adrenoreceptor and an RNA polymerase II complex indicate the potential to extend the diffraction resolution obtainable from very radiation-sensitive samples beyond that possible with undulator-based synchrotron sources.

  20. Femtosecond dark-field imaging with an X-ray free electron laser (CXIDB ID 19)

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

    Martin, A. V.

    2012-08-25

    This data was collected as part of the same experiment as the data deposited in [ID16](id-16.html). Experiment details are given in [Loh, N.D. et al.](http://dx.doi.org/10.1038/nature11222)

  1. Femtosecond diffractive imaging with a soft-X-ray free-electron laser (CXIDB ID 3)

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

    Chapman, H. N.

    2011-02-23

    The diffraction pattern of this entry corresponds to the one shown in **figure 2a** of the corresponding citation.

  2. Inverse Free Electron Laser Interactions with Sub-Picosecond High Brightness Electron Beams

    E-Print Network [OSTI]

    Moody, Joshua Timothy

    2014-01-01

    the OAP chamber, goes through a periscope that preserves itsthe OAP chamber, goes through a periscope that preserves itsPolarization Preserving Periscope Periscope with Window 500

  3. Femtosecond dark-field imaging with an X-ray free electron laser (CXIDB ID 19)

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

    Martin, A. V.

    This data was collected as part of the same experiment as the data deposited in [ID16](id-16.html). Experiment details are given in [Loh, N.D. et al.](http://dx.doi.org/10.1038/nature11222)

  4. Femtosecond diffractive imaging with a soft-X-ray free-electron laser (CXIDB ID 3)

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

    Chapman, H. N.

    The diffraction pattern of this entry corresponds to the one shown in **figure 2a** of the corresponding citation.

  5. R&D for a Soft X-Ray Free Electron Laser Facility

    E-Print Network [OSTI]

    Staples, John

    2009-01-01

    resolution electron beam diagnostics. • Radiation protectionelectron source, beam instrumentation and diagnostics andand diagnostics equipment to characterize the electron beam.

  6. R&D for a Soft X-Ray Free Electron Laser Facility

    E-Print Network [OSTI]

    Staples, John

    2009-01-01

    22(4): p. 1972. 23. D. H. Dowell, S.Z. Bethel, and K.D.2004) p. 330. 14. D. H. Dowell, et al. , Proc. of the 20071995). 10. E. Colby, D. Dowell, et al, “An Injector Test

  7. Exact and variational solutions of 3D Eigenmodes in high gain Free Electron Lasers

    E-Print Network [OSTI]

    Xie, M.

    2011-01-01

    Phys. Rev. A 41, 1662 [11] LCLS Design Study Report, SLAC-R-radial mode index. Consider LCLS nominal case as an exampleai/a r )2] (Ar/1f(Jx). For the LCLS example, the variational

  8. Design Studies for a VUV--Soft X-ray Free-Electron Laser Array

    E-Print Network [OSTI]

    Corlett, J.

    2010-01-01

    bunch arrival time in the LCLS, and another system that willFERMI@Elettra and 100 fs for LCLS, both requiring about 200-

  9. Three-dimensional analysis of free-electron laser performance using brightness scaled variables

    E-Print Network [OSTI]

    Gullans, M.

    2008-01-01

    to the Linac Coherent Light Source (LCLS) design, ESASEon the LCLS, and the optimal gain for a ?xed emittance.The parameters for LCLS used here are a beam energy of 13.64

  10. R&D for a Soft X-Ray Free Electron Laser Facility

    E-Print Network [OSTI]

    Staples, John

    2009-01-01

    2007). 41. P. Emma for the LCLS commissioning team, PAC2009Test Facility for the LCLS”, SLAC-TN-07-005, (2007). John N.Professional/Academic Director, LCLS Strategic Projects

  11. Design Studies for a VUV--Soft X-ray Free-Electron Laser Array

    E-Print Network [OSTI]

    Corlett, J.

    2010-01-01

    0.75 MV at Q 0 (kW) Peak wall power density at 0.75 MV (W/cmlarge and the power density on the walls is small and

  12. A CW normal-conductive RF gun for free electron laser and energy recovery linac applications

    E-Print Network [OSTI]

    Baptiste, Kenneth

    2009-01-01

    RF power for 750 kV Peak wall power density Stored energyimpedance, to minimize the wall power density, to reduce theresulting modest power load on the walls is compatible with

  13. Goniometer-based femtosecond crystallography with X-ray free electron lasers

    DOE Public Access Gateway for Energy & Science Beta (PAGES Beta)

    Cohen, Aina E.; Soltis, S. Michael; González, Ana; Aguila, Laura; Alonso-Mori, Roberto; Barnes, Christopher O.; Baxter, Elizabeth L.; Brehmer, Winnie; Brewster, Aaron S.; Brunger, Axel T.; et al

    2014-10-31

    The emerging method of femtosecond crystallography (FX) may extend the diffraction resolution accessible from small radiation-sensitive crystals and provides a means to determine catalytically accurate structures of acutely radiation-sensitive metalloenzymes. Automated goniometer-based instrumentation developed for use at the Linac Coherent Light Source enabled efficient and flexible FX experiments to be performed on a variety of sample types. In the case of rod-shaped Cpl hydrogenase crystals, only five crystals and about 30 min of beam time were used to obtain the 125 still diffraction patterns used to produce a 1.6-Å resolution electron density map. With smaller crystals, high-density grids were usedmore »to increase sample throughput; 930 myoglobin crystals mounted at random orientation inside 32 grids were exposed, demonstrating the utility of this approach. Screening results from cryocooled crystals of ?2-adrenoreceptor and an RNA polymerase II complex indicate the potential to extend the diffraction resolution obtainable from very radiation-sensitive samples beyond that possible with undulator-based synchrotron sources.« less

  14. R&D for a Soft X-Ray Free Electron Laser Facility

    E-Print Network [OSTI]

    Staples, John

    2009-01-01

    for Application to Inertial Confinement Fusion, 1998 SPIElaser systems for inertial confinement fusion (ICF). Early

  15. De novo protein crystal structure determination from X-ray free-electron laser data

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

    Barends, Thomas, R.M.

    Serial femtosecond crystallography (SFX) data of microcrystals of a lysozyme gadolinium derivative. The data was used to demonstrate de-novo phasing by single anomalous dispersion.

  16. Experimental Demonstration of a Soft X-ray Self-seeded Free-electron Laser

    DOE Public Access Gateway for Energy & Science Beta (PAGES Beta)

    Ratner, D. [SLAC National Accelerator Laboratory, Menlo Park, CA (United States); Abela, R. [Paul Scherrer Inst. (PSI), Villigen (Switzerland); Amann, J. [SLAC National Accelerator Laboratory, Menlo Park, CA (United States); Behrens, C. [SLAC National Accelerator Laboratory, Menlo Park, CA (United States); Bohler, D. [SLAC National Accelerator Laboratory, Menlo Park, CA (United States); Bouchard, G. [SLAC National Accelerator Laboratory, Menlo Park, CA (United States); Bostedt, C. [SLAC National Accelerator Laboratory, Menlo Park, CA (United States); Boyes, M. [SLAC National Accelerator Laboratory, Menlo Park, CA (United States); Chow, K. [Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States); Cocco, D. [SLAC National Accelerator Laboratory, Menlo Park, CA (United States); Decker, F. J. [SLAC National Accelerator Laboratory, Menlo Park, CA (United States); Ding, Y. [SLAC National Accelerator Laboratory, Menlo Park, CA (United States); Eckman, C. [SLAC National Accelerator Laboratory, Menlo Park, CA (United States); Emma, P. [SLAC National Accelerator Laboratory, Menlo Park, CA (United States); Fairley, D. [SLAC National Accelerator Laboratory, Menlo Park, CA (United States); Feng, Y. [SLAC National Accelerator Laboratory, Menlo Park, CA (United States); Field, C. [SLAC National Accelerator Laboratory, Menlo Park, CA (United States); Flechsig, U. [Paul Scherrer Inst. (PSI), Villigen (Switzerland); Gassner, G. [SLAC National Accelerator Laboratory, Menlo Park, CA (United States); Hastings, J. [SLAC National Accelerator Laboratory, Menlo Park, CA (United States); Heimann, P. [SLAC National Accelerator Laboratory, Menlo Park, CA (United States); Huang, Z. [SLAC National Accelerator Laboratory, Menlo Park, CA (United States); Kelez, N. [SLAC National Accelerator Laboratory, Menlo Park, CA (United States); Krzywinski, J. [SLAC National Accelerator Laboratory, Menlo Park, CA (United States); Loos, H. [SLAC National Accelerator Laboratory, Menlo Park, CA (United States); Lutman, A. [SLAC National Accelerator Laboratory, Menlo Park, CA (United States); Marinelli, A. [SLAC National Accelerator Laboratory, Menlo Park, CA (United States); Marcus, G. [SLAC National Accelerator Laboratory, Menlo Park, CA (United States); Maxwell, T. [SLAC National Accelerator Laboratory, Menlo Park, CA (United States); Moeller, S. [SLAC National Accelerator Laboratory, Menlo Park, CA (United States); Morton, D. [SLAC National Accelerator Laboratory, Menlo Park, CA (United States); Nuhn, H. D. [SLAC National Accelerator Laboratory, Menlo Park, CA (United States); Rodes, N. [Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States); Schlotter, W. [SLAC National Accelerator Laboratory, Menlo Park, CA (United States); Serkez, S. [Deutsches Elektronen-Synchrotron (DESY), Hamburg (Germany); Stevens, T. [Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States); Turner, J. [SLAC National Accelerator Laboratory, Menlo Park, CA (United States); Walz, D. [SLAC National Accelerator Laboratory, Menlo Park, CA (United States); Welch, J. [SLAC National Accelerator Laboratory, Menlo Park, CA (United States); Wu, J. [SLAC National Accelerator Laboratory, Menlo Park, CA (United States)

    2015-02-06

    The Linac Coherent Light Source (LCLS) has added self-seeding capability to the soft x-ray range using a grating monochromator system. We report demonstration of soft x-ray self-seeding with a measured resolving power of 2000-5000, wavelength stability of 10-4, and an increase in peak brightness by a factor of 2-5 across the photon energy range of 500-1000 eV. By avoiding the need for a monochromator at the experimental station, the self-seeded beam can deliver as much as 50 fold higher brightness to users.

  17. Design Overview of a Highly Stable Infrared Free Electron Laser at LBL

    E-Print Network [OSTI]

    Kim, K.-J.

    2011-01-01

    selected the modulating anode klystron for this purpose.In this device, the klystron beam is switched with a lowVoltage regulation of the klystron will be effective in

  18. A NEW VERSION OF A FREE ELECTRON LASER TWO BEAM ACCELERATOR

    E-Print Network [OSTI]

    Sessler, A.M.

    2008-01-01

    S. S. Yu, "Relativistic Klystron Version of the Two- BeamSubharmonic Drive Relativistic Klystron Work at LLNL", Proc.cavities -- a relativistic klystron (RK) as the microwave

  19. Free electron laser with bunched relativistic electron beam and electrostatic longitudinal wiggler

    SciTech Connect (OSTI)

    Sepehri Javan, Nasser [Department of Physics, University of Mohaghegh Ardabili, P.O. Box 179, Ardabil (Iran, Islamic Republic of)

    2010-06-15

    The system of the nonlinear nonstationary equations describing spatial-temporal dynamics of the amplitudes of an undulator radiation and a space charge wave of a relativistic electron beam in the resonator is obtained. The electrostatic longitudinal wiggler is considered. A bunch of the electron beam injects to the resonator, at the ends of which two mirrors are placed. After the interaction of electrons of bunch with radiation in the presence of wiggler and after amplifying electromagnetic pulse, a part of radiation is reflected back by semitransparent mirror. Then, it reaches to the initial of the system where the other mirror is placed. Synchronously, when the pulse is reflecting, the other electron bunch enters to the resonator and interacts with the pulse. This operation has simulated until saturation of growth of the electromagnetic pulse. The dynamics of the problem is simulated by the method of macro particles. The dynamics of pulse amplification, motion of the electrons, and spectra of output radiation in each stage are simulated.

  20. De novo protein crystal structure determination from X-ray free-electron laser data

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

    Barends, Thomas, R.M.

    2013-11-25

    Serial femtosecond crystallography (SFX) data of microcrystals of a lysozyme gadolinium derivative. The data was used to demonstrate de-novo phasing by single anomalous dispersion.

  1. R&D for a Soft X-Ray Free Electron Laser Facility

    E-Print Network [OSTI]

    Staples, John

    2009-01-01

    efforts of the International Linear Collider Global Designfrom the International Linear Collider R&D program, the LCLSlinac of the International Linear Collider and the DOE-

  2. Influence of finite radial geometry on the growth rate of ion-channel free electron laser

    SciTech Connect (OSTI)

    Bahmani, Mohammad; Hamzehpour, Hossein; Hasanbeigi, Ali

    2013-11-15

    The influence of finite radial geometry on the instability of a tenuous relativistic electron beam propagating in an ion-channel in a waveguide is investigated. The instability analysis is based on the linearized Vlasov-Maxwell equations for the perturbation about a self-consistent beam equilibrium. With the help of characteristic method the dispersion relation for the TE-mode is derived and analyzed through the numerical solutions. It is found that the positioning of the beam radius R{sub b} relative to the waveguide radius R{sub c}, and the ion-channel frequency can have a large influence on the maximum growth rate and corresponding wave number.

  3. Femtosecond diffractive imaging with a soft-X-ray free-electron laser

    E-Print Network [OSTI]

    Loss, Daniel

    , STEFANO MARCHESINI1,2 , BRUCE W. WOODS1 , SASA BAJT1 , W. HENRY BENNER1 , RICHARD A. LONDON1,2 , ELKE PL Synchrotron Radiation Laboratory, Stanford Linear Accelerator Center, 2575 Sand Hill Road, Menlo Park

  4. R&D for a Soft X-Ray Free Electron Laser Facility

    E-Print Network [OSTI]

    Staples, John

    2009-01-01

    of Directors: Positive Light Incorporated, Los Gatos, CA.Light Incorporated, Los Gatos, CA. Consultant: Spectra-Light Incorporated, Los Gatos, CA. Involved in all aspects

  5. Design Considerations for the Free-Electron Laser with Self-Seeding...

    Office of Scientific and Technical Information (OSTI)

    Bibtex Format Close 0 pages in this document matching the terms "" Search For Terms: Enter terms in the toolbar above to search the full text of this document for pages...

  6. The European X-ray Free-Electron Laser: A Progress Report | Stanford...

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

    for development of imaging detectors, of instruments and of the ancillary facilities, with involvement of external laboratories and institutes in Europe, shall also be described...

  7. The European X-ray Free-Electron Laser: A Progress Report | Stanford

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

    AFDC Printable Version Share this resource Send a link to EERE: Alternative Fuels Data Center Home Page to someone by E-mail Share EERE: Alternative Fuels Data Center Home Page on Facebook Tweet about EERE: Alternative Fuels Data Center Home Page on Twitter Bookmark EERE: Alternative Fuels Data Center Homesum_a_epg0_fpd_mmcf_m.xls" ,"Available from WebQuantity ofkandz-cm11 Outreach Home RoomPreservationBio-Inspired Solar FuelTechnologyTel: Name: Rm. Tel:Test1TheDaleThe End

  8. Design Considerations for the Free-Electron Laser with Self-Seeding and

    Office of Scientific and Technical Information (OSTI)

    AFDC Printable Version Share this resource Send a link to EERE: Alternative Fuels Data Center Home Page to someone by E-mail Share EERE: Alternative Fuels Data Center Home Page on Facebook Tweet about EERE: Alternative Fuels Data Center Home Page on Twitter Bookmark EERE: Alternative Fuels Data Center Homesum_a_epg0_fpd_mmcf_m.xls" ,"Available from WebQuantity of NaturalDukeWakefield MunicipalTechnical Report:Speeding accessby aLED Street Lighting Host Site: City of Kansas City,

  9. Design Considerations for the Free-Electron Laser with Self-Seeding and

    Office of Scientific and Technical Information (OSTI)

    AFDC Printable Version Share this resource Send a link to EERE: Alternative Fuels Data Center Home Page to someone by E-mail Share EERE: Alternative Fuels Data Center Home Page on Facebook Tweet about EERE: Alternative Fuels Data Center Home Page on Twitter Bookmark EERE: Alternative Fuels Data Center Homesum_a_epg0_fpd_mmcf_m.xls" ,"Available from WebQuantity of NaturalDukeWakefield MunicipalTechnical Report:Speeding accessby aLED Street Lighting Host Site: City of Kansas City,Current

  10. Distributed seeding for narrow-line width hard x-ray free-electron lasers

    Office of Scientific and Technical Information (OSTI)

    AFDC Printable Version Share this resource Send a link to EERE: Alternative Fuels Data Center Home Page to someone by E-mail Share EERE: Alternative Fuels Data Center Home Page on Facebook Tweet about EERE: Alternative Fuels Data Center Home Page on Twitter Bookmark EERE: Alternative Fuels Data Center Homesum_a_epg0_fpd_mmcf_m.xls" ,"Available from WebQuantity of NaturalDukeWakefield MunicipalTechnical Report:Speeding accessby aLED Street Lighting Host Site: City ofNovelQ3:Q3:

  11. Distributed seeding for narrow-line width hard x-ray free-electron lasers

    Office of Scientific and Technical Information (OSTI)

    AFDC Printable Version Share this resource Send a link to EERE: Alternative Fuels Data Center Home Page to someone by E-mail Share EERE: Alternative Fuels Data Center Home Page on Facebook Tweet about EERE: Alternative Fuels Data Center Home Page on Twitter Bookmark EERE: Alternative Fuels Data Center Homesum_a_epg0_fpd_mmcf_m.xls" ,"Available from WebQuantity of NaturalDukeWakefield MunicipalTechnical Report:Speeding accessby aLED Street Lighting Host Site: City

  12. Experimental demonstration of a soft x-ray self-seeded free-electron laser

    Office of Scientific and Technical Information (OSTI)

    AFDC Printable Version Share this resource Send a link to EERE: Alternative Fuels Data Center Home Page to someone by E-mail Share EERE: Alternative Fuels Data Center Home Page on Facebook Tweet about EERE: Alternative Fuels Data Center Home Page on Twitter Bookmark EERE: Alternative Fuels Data Center Homesum_a_epg0_fpd_mmcf_m.xls" ,"Available from WebQuantity of NaturalDukeWakefield MunicipalTechnical Report:Speeding accessby aLED Street Lighting HostDISCLAIMERlinac

  13. Maximizing spectral flux from self-seeding hard x-ray free electron lasers

    Office of Scientific and Technical Information (OSTI)

    AFDC Printable Version Share this resource Send a link to EERE: Alternative Fuels Data Center Home Page to someone by E-mail Share EERE: Alternative Fuels Data Center Home Page on Facebook Tweet about EERE: Alternative Fuels Data Center Home Page on Twitter Bookmark EERE: Alternative Fuels Data Center Homesum_a_epg0_fpd_mmcf_m.xls" ,"Available from WebQuantity of NaturalDukeWakefield MunicipalTechnical Report:Speeding accessby aLED Street LightingFrom theHighI _s - "U N C-

  14. DOE Science Showcase - Free-Electron Lasers | OSTI, US Dept of Energy,

    Office of Scientific and Technical Information (OSTI)

    AFDC Printable Version Share this resource Send a link to EERE: Alternative Fuels Data Center Home Page to someone by E-mail Share EERE: Alternative Fuels Data Center Home Page on Facebook Tweet about EERE: Alternative Fuels Data Center Home Page on Twitter Bookmark EERE: Alternative Fuels Data Center Homesum_a_epg0_fpd_mmcf_m.xls" ,"Available from WebQuantity of NaturalDukeWakefield Municipal GasAdministration Medal01TechnicalScientific and TechnicalOffice ofOfficeEnergy,Office of

  15. A single-shot transmissive spectrometer for hard x-ray free electron lasers

    Office of Scientific and Technical Information (OSTI)

    AFDC Printable Version Share this resource Send a link to EERE: Alternative Fuels Data Center Home Page to someone by E-mail Share EERE: Alternative Fuels Data Center Home Page on Facebook Tweet about EERE: Alternative Fuels Data Center Home Page on Twitter Bookmark EERE: Alternative Fuels Data Center Homesum_a_epg0_fpd_mmcf_m.xls" ,"Available from WebQuantity of NaturalDukeWakefield Municipal GasAdministrationTechnicalTechnicalScience.govWSRC-MS-g8-00318 Heat(Journal Article) |

  16. A single-shot transmissive spectrometer for hard x-ray free electron lasers

    Office of Scientific and Technical Information (OSTI)

    AFDC Printable Version Share this resource Send a link to EERE: Alternative Fuels Data Center Home Page to someone by E-mail Share EERE: Alternative Fuels Data Center Home Page on Facebook Tweet about EERE: Alternative Fuels Data Center Home Page on Twitter Bookmark EERE: Alternative Fuels Data Center Homesum_a_epg0_fpd_mmcf_m.xls" ,"Available from WebQuantity of NaturalDukeWakefield MunicipalTechnicalInformation4563 LLNL(Technicalentanglements for linearAoffromGalerkin

  17. Efficiency Enhancement in a Tapered Free Electron Laser by Varying the

    Office of Scientific and Technical Information (OSTI)

    AFDC Printable Version Share this resource Send a link to EERE: Alternative Fuels Data Center Home Page to someone by E-mail Share EERE: Alternative Fuels Data Center Home Page on Facebook Tweet about EERE: Alternative Fuels Data Center Home Page on Twitter Bookmark EERE: Alternative Fuels Data Center Homesum_a_epg0_fpd_mmcf_m.xls" ,"Available from WebQuantity of NaturalDukeWakefieldSulfate Reducing(Journal Article) | SciTech(Journal Article) | SciTech Connectan oxide

  18. Efficiency Enhancement in a Tapered Free Electron Laser by Varying the

    Office of Scientific and Technical Information (OSTI)

    AFDC Printable Version Share this resource Send a link to EERE: Alternative Fuels Data Center Home Page to someone by E-mail Share EERE: Alternative Fuels Data Center Home Page on Facebook Tweet about EERE: Alternative Fuels Data Center Home Page on Twitter Bookmark EERE: Alternative Fuels Data Center Homesum_a_epg0_fpd_mmcf_m.xls" ,"Available from WebQuantity of NaturalDukeWakefieldSulfate Reducing(Journal Article) | SciTech(Journal Article) | SciTech Connectan oxideElectron Beam

  19. Eigenmode analysis of a high-gain free-electron laser based on a transverse

    Office of Scientific and Technical Information (OSTI)

    AFDC Printable Version Share this resource Send a link to EERE: Alternative Fuels Data Center Home Page to someone by E-mail Share EERE: Alternative Fuels Data Center Home Page on Facebook Tweet about EERE: Alternative Fuels Data Center Home Page on Twitter Bookmark EERE: Alternative Fuels Data Center Homesum_a_epg0_fpd_mmcf_m.xls" ,"Available from WebQuantity of NaturalDukeWakefieldSulfate Reducing(Journal Article) | SciTech(Journal Article) | SciTech(Journal Article)gradient

  20. Experimental demonstration of a soft x-ray self-seeded free-electron laser

    Office of Scientific and Technical Information (OSTI)

    AFDC Printable Version Share this resource Send a link to EERE: Alternative Fuels Data Center Home Page to someone by E-mail Share EERE: Alternative Fuels Data Center Home Page on Facebook Tweet about EERE: Alternative Fuels Data Center Home Page on Twitter Bookmark EERE: Alternative Fuels Data Center Homesum_a_epg0_fpd_mmcf_m.xls" ,"Available from WebQuantity of NaturalDukeWakefieldSulfate Reducing(Journal Article) | SciTech(Journal(Patent)pressure|the typEsilica

  1. Exploring the Wavefront of Hard X-Ray Free-Electron Laser Radiation

    Office of Scientific and Technical Information (OSTI)

    AFDC Printable Version Share this resource Send a link to EERE: Alternative Fuels Data Center Home Page to someone by E-mail Share EERE: Alternative Fuels Data Center Home Page on Facebook Tweet about EERE: Alternative Fuels Data Center Home Page on Twitter Bookmark EERE: Alternative Fuels Data Center Homesum_a_epg0_fpd_mmcf_m.xls" ,"Available from WebQuantity of NaturalDukeWakefieldSulfate Reducing(Journal Article) |production at a linear collider (Conference) |

  2. Focus characterization at an X-ray free-electron laser by coherent

    Office of Scientific and Technical Information (OSTI)

    AFDC Printable Version Share this resource Send a link to EERE: Alternative Fuels Data Center Home Page to someone by E-mail Share EERE: Alternative Fuels Data Center Home Page on Facebook Tweet about EERE: Alternative Fuels Data Center Home Page on Twitter Bookmark EERE: Alternative Fuels Data Center Homesum_a_epg0_fpd_mmcf_m.xls" ,"Available from WebQuantity of NaturalDukeWakefieldSulfate Reducing(Journal Article) |production atmeasurementComparisonArticle) |(Conference) |

  3. Focus characterization at an X-ray free-electron laser by coherent

    Office of Scientific and Technical Information (OSTI)

    AFDC Printable Version Share this resource Send a link to EERE: Alternative Fuels Data Center Home Page to someone by E-mail Share EERE: Alternative Fuels Data Center Home Page on Facebook Tweet about EERE: Alternative Fuels Data Center Home Page on Twitter Bookmark EERE: Alternative Fuels Data Center Homesum_a_epg0_fpd_mmcf_m.xls" ,"Available from WebQuantity of NaturalDukeWakefieldSulfate Reducing(Journal Article) |production atmeasurementComparisonArticle) |(Conference) |scattering

  4. Purified self-amplified spontaneous emission free-electron lasers with

    Office of Scientific and Technical Information (OSTI)

    AFDC Printable Version Share this resource Send a link to EERE: Alternative Fuels Data Center Home Page to someone by E-mail Share EERE: Alternative Fuels Data Center Home Page on Facebook Tweet about EERE: Alternative Fuels Data Center Home Page on Twitter Bookmark EERE: Alternative Fuels Data Center Homesum_a_epg0_fpd_mmcf_m.xls" ,"Available from WebQuantity of NaturalDukeWakefieldSulfateSciTech ConnectSpeedingConnect Pulse energy measurement at the SXRArticle) |

  5. Reabsorption of Soft X-Ray Emission at High X-Ray Free-Electron Laser

    Office of Scientific and Technical Information (OSTI)

    AFDC Printable Version Share this resource Send a link to EERE: Alternative Fuels Data Center Home Page to someone by E-mail Share EERE: Alternative Fuels Data Center Home Page on Facebook Tweet about EERE: Alternative Fuels Data Center Home Page on Twitter Bookmark EERE: Alternative Fuels Data Center Homesum_a_epg0_fpd_mmcf_m.xls" ,"Available from WebQuantity of NaturalDukeWakefieldSulfateSciTech ConnectSpeedingConnect PulseSummary (ProgrambatteriesLi- and Mn-Rich

  6. Toward a Single Mode Free Electron Laser for Coherent Hard X-Ray

    Office of Scientific and Technical Information (OSTI)

    AFDC Printable Version Share this resource Send a link to EERE: Alternative Fuels Data Center Home Page to someone by E-mail Share EERE: Alternative Fuels Data Center Home Page on Facebook Tweet about EERE: Alternative Fuels Data Center Home Page on Twitter Bookmark EERE: Alternative Fuels Data Center Homesum_a_epg0_fpd_mmcf_m.xls" ,"Available from WebQuantity of NaturalDukeWakefieldSulfateSciTechtail.Theory of rare Kaon and Pion

  7. Toward a Single Mode Free Electron Laser for Coherent Hard X-Ray

    Office of Scientific and Technical Information (OSTI)

    AFDC Printable Version Share this resource Send a link to EERE: Alternative Fuels Data Center Home Page to someone by E-mail Share EERE: Alternative Fuels Data Center Home Page on Facebook Tweet about EERE: Alternative Fuels Data Center Home Page on Twitter Bookmark EERE: Alternative Fuels Data Center Homesum_a_epg0_fpd_mmcf_m.xls" ,"Available from WebQuantity of NaturalDukeWakefieldSulfateSciTechtail.Theory of rare Kaon and PionExperiments (Journal Article) | SciTech Connect

  8. Free Electron Laser Program Program at TJNAF| U.S. DOE Office of Science

    Office of Science (SC) Website

    AFDC Printable Version Share this resource Send a link to EERE: Alternative Fuels Data Center Home Page to someone by E-mail Share EERE: Alternative Fuels Data Center Home Page on Facebook Tweet about EERE: Alternative Fuels Data Center Home Page on Twitter Bookmark EERE: Alternative Fuels Data Center Homesum_a_epg0_fpd_mmcf_m.xls" ,"Available from WebQuantityBonneville Power AdministrationRobust,Field-effectWorkingLosThe 26thIWalterOptimizing(SC)Fermi NationalFermiFlorida

  9. VISA: A Milestone on the Path towards X-Ray Free Electron Lasers | Stanford

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

    AFDC Printable Version Share this resource Send a link to EERE: Alternative Fuels Data Center Home Page to someone by E-mail Share EERE: Alternative Fuels Data Center Home Page on Facebook Tweet about EERE: Alternative Fuels Data Center Home Page on Twitter Bookmark EERE: Alternative Fuels Data Center Homesum_a_epg0_fpd_mmcf_m.xls" ,"Available from WebQuantityBonneville Power AdministrationRobust,Field-effectWorking WithTelecentric viewing system forPortal.1 - March

  10. The World's First Free-Electron X-ray Laser | Department of Energy

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

    AFDC Printable Version Share this resource Send a link to EERE: Alternative Fuels Data Center Home Page to someone by E-mail Share EERE: Alternative Fuels Data Center Home Page on Facebook Tweet about EERE: Alternative Fuels Data Center Home Page on Twitter Bookmark EERE: Alternative Fuels Data Center Home Page on Google Bookmark EERE: Alternative Fuels Data Center Home Page on Delicious RankADVANCEDInstallers/ContractorsPhotovoltaicsState ofSavings for Specific Measures (April U.S.First

  11. In the OSTI Collections: Free-Electron Lasers | OSTI, US Dept of Energy,

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

    AFDC Printable Version Share this resource Send a link to EERE: Alternative Fuels Data Center Home Page to someone by E-mail Share EERE: Alternative Fuels Data Center Home Page on Facebook Tweet about EERE: Alternative Fuels Data Center Home Page on Twitter Bookmark EERE: Alternative Fuels Data Center Homesum_a_epg0_fpd_mmcf_m.xls" ,"Available from WebQuantity ofkandz-cm11 Outreach Home Room NewsInformation CurrentHenry Bellamy,Impact AssessmentsImprovingIn CaseLaboratory |ofOffice of

  12. Femtosecond diffractive imaging with a soft-X-ray free-electron laser

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

    AFDC Printable Version Share this resource Send a link to EERE: Alternative Fuels Data Center Home Page to someone by E-mail Share EERE: Alternative Fuels Data Center Home Page on Facebook Tweet about EERE: Alternative Fuels Data Center Home Page on Twitter Bookmark EERE: Alternative Fuels Data Center Homesum_a_epg0_fpd_mmcf_m.xls" ,"Available from WebQuantityBonneville Power Administration would like submitKansasCommunitiesofExtransScientificEnergyBattlefieldFemtosecond

  13. Science Driver Requirements for Seeded Soft X-ray Free Electron Lasers |

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

    AFDC Printable Version Share this resource Send a link to EERE: Alternative Fuels Data Center Home Page to someone by E-mail Share EERE: Alternative Fuels Data Center Home Page on Facebook Tweet about EERE: Alternative Fuels Data Center Home Page on Twitter Bookmark EERE: Alternative Fuels Data Center Homesum_a_epg0_fpd_mmcf_m.xls" ,"Available from WebQuantity ofkandz-cm11 Outreach Home RoomPreservation ofAlbuquerque| Stanford SynchrotronVideo-Contest Sign56ScienceOpensStanford

  14. Energy of the quasi-free electron in argon, krypton and xenon Xianbo Shi a,b

    E-Print Network [OSTI]

    Findley, Gary L.

    Energy of the quasi-free electron in argon, krypton and xenon Xianbo Shi a,b , Luxi Li a,b , C. M ionization of the dopant, and (iii) the kinetic energy of the quasi-free electron. The polarization terms are determined by a standard statistical mechanical treatment. However, the kinetic energy of the quasi-free

  15. A unit vector for characterizing the spin polarization of free electron

    E-Print Network [OSTI]

    Chun-Fang Li; Yan Wang

    2010-08-05

    New degrees of freedom having the form of a unit vector are identified for characterizing the spin polarization of free electron. It is shown that when only the spin is considered, the non-commutativity of the Cartesian components of the Pauli vector allows us to use the azimuthal angle of a second direction, denoted by unit vector $\\mathbf I$, with respect to the quantization direction to characterize the spin polarization. The rotation of $\\mathbf I$ through an angle about the quantization axis leads to a rotation of the spin polarization vector through twice the angle about the same axis. Discussions are also made in Heisenberg picture as well. Upon utilizing this approach to a free electron and letting the quantization direction for each plane wave be the wave vector, we arrive at a representation in which the unit vector $\\mathbf I$ functions as an independent index to characterize the spin polarization.

  16. Application Of Multilayer Piezoelectric Elements For Resonant Cavity Deformation In VUV-FEL DESY Accelerator

    E-Print Network [OSTI]

    Napieralski, A

    2005-01-01

    Application Of Multilayer Piezoelectric Elements For Resonant Cavity Deformation In VUV-FEL DESY Accelerator

  17. Human Communication Technologies Laboratory Changsong Shen, Steve Oldridge, Gregor Miller, Amir Afrah, and Sidney Fels

    E-Print Network [OSTI]

    Millerm Gregor

    Afrah, and Sidney Fels Department of Electrical and Computer Engineering, University of British Columbia

  18. FlowField: Investigating the Semantics of Caress Timothy Chen, Sidney Fels

    E-Print Network [OSTI]

    British Columbia, University of

    FlowField: Investigating the Semantics of Caress Timothy Chen, Sidney Fels Electrical & Computer [Fels et al. 1997; Fels and Mase 1999]. Furthermore, having a direct relation be- tween action. References FELS, S., AND MASE, K. 1999. Iamascope: A Graphical Musical Instru- ment. Computers and Graphics

  19. Contributions to the FEL2002 Conference, September 9-13, 2002 in Argonne, USA

    E-Print Network [OSTI]

    Contributions to the FEL2002 Conference, September 9-13, 2002 in Argonne, USA October 2002, TESLA-FEL of the statistical properties of the radiation from a VUV SASE FEL operating in the femtosecond regime of Statistical Properties of the Third Harmonic of the SASE FEL Radiation

  20. Contributions to the FEL'99 Conference, August 23-28, 1999 in Hamburg, Germany

    E-Print Network [OSTI]

    Contributions to the FEL'99 Conference, August 23-28, 1999 in Hamburg, Germany TESLA FEL of the VUV FEL at the TESLA Tesl Facility Physik, Garching Test Results on the Silicon Pixel Detector for the TTF-FEL Beam Trajectory Monitor

  1. Using pipe with corrugated walls for a sub-terahertz FEL

    E-Print Network [OSTI]

    Stupakov, Gennady

    2014-01-01

    It has been noted in the past, in the study of the wall-roughness impedance, that a metallic pipe with corrugated walls supports propagation of a high-frequency mode that is in resonance with a relativistic beam. This mode can be excited by a beam whose length is a fraction of the wavelength. In this paper, we study another option of excitation of the resonant mode in a metallic pipe with corrugated walls---via the mechanism of the free electron laser instability. This mechanism works if the bunch length is much longer than the wavelength of the radiation.

  2. Magnetic field measurements of a superconducting undulator for a Harmonic Generation FEL experiment at the NSLS

    SciTech Connect (OSTI)

    Solomon, L.; Ingold, G.; Ben-Zvi, I.; Krinsky, S.; Yu, L.H.; Sampson, W.; Robins, K.

    1993-07-01

    An 18mm period, 0.54 Tesla, 8mm gap superconducting undulator with both horizontal and vertical focusing has been built and tested. This magnet, which is fabricated in 25 cm length sections, is being tested for use in the radiator section (total magnet length of 1.5 m) of the Harmonic Generation Free Electron Laser experiment at the National Synchrotron Light Source - Accelerator Test Facility at Brookhaven National Lab., in collaboration with Grumman Corp. The measurement system is outlined, sources and estimates of errors are described, and some magnetic field data are presented and discussed.

  3. The Jefferson lab FEL driver ERLs

    SciTech Connect (OSTI)

    Douglas, David R.; Tennant, Christopher D.

    2013-11-01

    Jefferson Lab has - for over a decade - been operating high power IR and UV FELs using CW energy recovering linacs based on DC photocathode electron sources and CEBAF SRF technology. These machines have unique combinations of beam quality, power, and operational flexibility, and thus offer significant opportunity for experiments that use low and medium energy (several tens - few hundreds of MeV) electron beams. We will describe the systems and detail their present and near-term (potential) performance. Recent internal-target analysis and validation testing will be discussed, and schemes for single- and two-pass fixed target operation described. An introduction to subsequent discussions of beam quality and upgrade paths to polarized operation/higher energy will be given.

  4. Free-electron maser driven by a two-stage ferroelectric electron gun M. Einat, E. Jerby,a)

    E-Print Network [OSTI]

    Jerby, Eli

    Free-electron maser driven by a two-stage ferroelectric electron gun M. Einat, E. Jerby,a) and G; accepted 25 November 2002 A two-stage ferroelectric electron gun is employed in a free-electron maser FEM oscillator experiment. This gun produces a pulsed electron beam of a 5­15 keV energy, 0.5 A current, and 3

  5. Iamascope: A Graphical Musical Instrument Sidney Fels Kenji Mase

    E-Print Network [OSTI]

    British Columbia, University of

    Iamascope: A Graphical Musical Instrument Sidney Fels Kenji Mase Dept. of Electrical and Computer with this aesthetically uplifting interactive device. In the installation, the user takes the place of a colourful piece

  6. RADIO FREQUENCY PHASE IN THE FEL SECTION OF A TBA

    E-Print Network [OSTI]

    Kuenning, R.W.

    2008-01-01

    Amplitude Control of the Radio Frequency Wave in the Two-Madison, WI, August 21-27, 1986 RADIO FREQUENCY PHASE IN THEAC03-76SF00098 LBL- 223Pl RADIO FREQUENCY PHASE IN THE FEL

  7. Experimental Possibilities in Material Science enabled by FEL...

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

    Experimental Possibilities in Material Science enabled by FEL Sources Wednesday, July 1, 2015 - 3:00pm SLAC, Redtail Hawk Conference Room 108A Speaker: Joerg Hallmann, XFEL Program...

  8. Peculiarities of the Light Absorption and Emission by Free Electrons in Multivalley Semiconductors

    E-Print Network [OSTI]

    P. M. Tomchuk

    2008-11-18

    General expressions are obtained for the coefficient of light absorption by free carriers as well as the intensity of the spontaneous light emission by hot electrons in multivalley semiconductors. These expressions depend on the electron concentration and electron temperature in the individual valleys. An anisotropy of the dispersion law and electron scattering mechanisms is taken into account. Impurity-related and acoustic scattering mechanisms are analyzed. Polarization dependence of the spontaneous emission by hot electrons is found out. At unidirectional pressure applied or high irradiation intensities, the polarization dependence also appears in the coefficient of light absorption by free electrons.

  9. Fully QED/relativistic theory of light pressure on free electrons by isotropic radiation

    E-Print Network [OSTI]

    A. E. Kaplan

    2015-07-27

    A relativistic/QED theory of light pressure on electrons by an isotropic, in particular blackbody radiation predicts thermalization rates of free electrons over entire span of energies available in the lab and the nature. The calculations based on the QED Klein-Nishina theory of electron-photon scattering and relativistic Fokker-Planck equation, show that the transition from classical (Thompson) to QED (Compton) thermalization determined by the product of electron energy and radiation temperature, is reachable under conditions for controlled nuclear fusion, and predicts large acceleration of electron thermalization in the Compton domain and strong damping of plasma oscillations at the temperatures near plasma nuclear fusion.

  10. j szocializmus fel: Bevezet W. Paul Cockshott Allin Cottrell

    E-Print Network [OSTI]

    Cockshott, W. Paul

    , hogy a szociáldemokrácia túlságosan sokat ad fel a szocializmus történelmi ambícióiból termelési módja révén különböztessük meg a többitl, akkor fel kell ismernünk, hogy a szocializmus nem egy

  11. THE SECOND STAGE OF FERMI@ELETTRA: A SEEDED FEL IN THE SOFT X-RAY SPECTRAL RANGE

    E-Print Network [OSTI]

    Allaria, E.

    2010-01-01

    OF FERMI@ELETTRA: A SEEDED FEL IN THE SOFT X-RAY SPECTRALTrieste, Italy. Abstract The second stage of the FERMI FEL,named FEL-2, is based on the principle of high-gain harmonic

  12. Simple Formula for the Optimization of the FEL Gain Length Including the Effects of Emittance, Betatron Oscillations and Energy Spread

    E-Print Network [OSTI]

    Chin, Y.H.

    2011-01-01

    for a quick estimate of the FEL parameters which minimizefor the Optimization of the FEL Gain Length Including thet h e Optimization o f the FEL Gain Length Including t h e

  13. LCLS X-Ray FEL Output Performance in the Presence of Highly Time-Dependent Undulator Wakefields

    E-Print Network [OSTI]

    Bane, Karl L.F.; Emma, Paul; Huang, Heinz-Dieter Nuhn; Stupakov, Gennady; Fawley, William M.; Reiche, Sven

    2005-01-01

    al. , “Optimization of the LCLS X-RAY FEL Performance in theLCLS X-Ray FEL Output Performance in the Presence of Highlyeld strength, can degrade the FEL process by detun- ing the

  14. A FOUR-DIMENSIONAL VLASOV SOLVER FOR MICROBUNCHING INSTABILITY IN THE INJECTION SYSTEM FOR X-RAY FELS

    E-Print Network [OSTI]

    Migliorati, Mauro

    2008-01-01

    et al. , DESY Report No. TESLA-FEL 95-05, 1995. [8] A. Chao,in Linac dedicated to FEL oper- ation. The goal is tothe proper operation of the FEL-based next genera- tion of

  15. A concept for Z-dependent microbunching measurements with coherent X-ray transition radiation in a sase FEL

    E-Print Network [OSTI]

    Lumpkin, A.H.; Fawley, W.M.; Rule, D.W.

    2004-01-01

    Model to Data from a SASE FEL at 540, 265, and 157 nm,”simulation of the x-ray SASE FEL showing the SASE radiationTRANSITION RADIATION IN A SASE FEL* A.H. Lumpkin # , W.M.

  16. Propagation of gamma rays and production of free electrons in air

    SciTech Connect (OSTI)

    Dimant, Y. S.; Nusinovich, G. S.; Romero-Talamas, C. A.; Granatstein, V. L.; Sprangle, P.; Penano, J.

    2012-10-15

    This paper is devoted to the analysis of production of free electrons in air by gamma-rays leaking from radioactive materials. A model based on the Klein-Nishina scattering theory is used to calculate scattering cross sections and approximate the electron production rate. The model includes the effects of primary gamma-quanta radiated by the source as well as that scattered in air. Comparison of the model with the mcnpx kinetic code (http://mcnpx.lanl.gov/) in a sample problem shows excellent agreement. The motivation for this research comes from the recently proposed concept of remote detection of concealed radioactive materials [V. L. Granatstein and G. S. Nusinovich, J. Appl. Phys. 108, 063304 (2010)]. The concept is based on the breakdown in air at the focal point of a high-power beam of electromagnetic waves produced by a THz gyrotron with a 10-20 {mu}s pulse. The presence of a radioactive material can greatly exceed the production rate of free electrons over the natural background rate. Additional electrons act as seeds to initiate the breakdown and create sufficiently dense plasma at the focal region. The dense plasma can then be remotely detected as an unambiguous effect of the concealed radioactive material.

  17. Search for: All records | SciTech Connect

    Office of Scientific and Technical Information (OSTI)

    (1) explosions (1) femtosecond studies (1) free-electron laser (1) grazing (1) hard x radiation (1) instrumentation related to nuclear science and technology fel (1) kev range (1)...

  18. Self-Stimulated Undulator Klystron

    E-Print Network [OSTI]

    Bessonov, E G; Mikhailichenko, A A

    2011-01-01

    The Self Stimulated Undulator Klystron (SSUK) and its possible applications in the Particle Accelerator Physics, incoherent Self-Stimulated Undulator Radiation Sources (SSUR) and Free-Electron Lasers (FEL) are discussed.

  19. LDRD Program Plan master

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

    energy of CEBAF. In addition, it facilitated the development of our Free Electron Laser (FEL) and Energy Recovery Linac (ERL), key future state-of-the-art techniques to support...

  20. Search for: All records | SciTech Connect

    Office of Scientific and Technical Information (OSTI)

    free electron laser (FEL) pulses is crucial for their use in diffractive imaging. We describe how the distribution of average phase tilts and intensities on hard x-ray pulses with...

  1. Getting to the starting line | Jefferson Lab

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

    for Proposals to further develop the technology of the high-power, infrared free-electron laser. Prior to this, high-power infrared FEL development work was primarily done at...

  2. Ultraviolet | Jefferson Lab

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

    States. For some years, the Jefferson Lab FEL has been a world leader in free-electron laser power. Strongly supported by funding from the Office of Naval Research, it achieved...

  3. VisionGL: Towards an API for Integrating Vision and Graphics Gregor Miller and Sidney Fels

    E-Print Network [OSTI]

    British Columbia, University of

    VisionGL: Towards an API for Integrating Vision and Graphics Gregor Miller and Sidney Fels Human) and per- formance/appearance capture. Recently we introduced OpenVL [Miller and Fels 2013], an abstraction

  4. OpenVL: A Developer-Level Abstraction of Computer Vision Gregor Miller and Sidney Fels

    E-Print Network [OSTI]

    British Columbia, University of

    OpenVL: A Developer-Level Abstraction of Computer Vision Gregor Miller and Sidney Fels Human- ple language model [Miller and Fels 2013]); the third is a detailed description of the individual

  5. Electron Beam Diagnostics Of The JLAB UV FEL

    SciTech Connect (OSTI)

    Evtushenko, Pavel; Benson, Stephen; Biallas, George; Coleman, James; Dickover, Cody; Douglas, David; Marchlik, Matthew; Sexton, Daniel; Tennant, Christopher

    2011-03-01

    In this contribution we describe various systems and aspects of the electron beam diagnostics of the JLab UV FEL. The FEL is installed on a new bypass beam line at the existing 10 kW IR Upgrade FEL. Here, we describe a set of the following systems. A combination of OTR and phosphor viewers is used for measurements of the transverse beam profile, transverse emittance, and Twiss parameters. This system is also used for alignment of the optical cavity of the UV oscillator and to ensure the overlap between the electron beam and optical mode in the FEL wiggler. A system of beam position monitors equipped with log-amp based BPM electronics. Bunch length on the order of 120 fs RMS is measured with the help of a modified Martin-Puplett interferometer. The longitudinal transfer function measurement system is used to set up bunch compression in an optimal way, such that the LINAC RF curvature is compensated using only higher order magnetic elements of the beam transport. This set of diagnostic systems made a significant contribution in achieving first lasing of the FEL after only about 60 hours of beam operation.

  6. Remote electrical arc suppression by laser filamentation

    E-Print Network [OSTI]

    Schubert, Elise; Kasparian, Jérôme; Wolf, Jean-Pierre

    2015-01-01

    We investigate the interaction of narrow plasma channels formed in the filamentation of ultrashort laser pulses, with a DC high voltage. The laser filaments prevent electrical arcs by triggering corona that neutralize the high-voltage electrodes. This phenomenon, due to the electric field modulation and free electron release around the filament, opens new prospects to lightning and over-voltage mitigation.

  7. Pathway to a Compact SASE FEL Device

    E-Print Network [OSTI]

    Dattoli, G; Petrillo, V; Rau, J V; Sabia, E; Spassovsky, I; Biedron, S G; Einstein, J; Milton, S V

    2015-01-01

    Newly developed high peak power lasers have opened the possibilities of driving coherent light sources operating with laser plasma accelerated beams and wave undulators. We speculate on the combination of these two concepts and show that the merging of the underlying technologies could lead to new and interesting possibilities to achieve truly compact, coherent radiator devices.

  8. HARMONIC CASCADE FEL DESIGNS FOR LUX, A FACILTY FOR ULTRAFAST X-RAY SCIENCE

    E-Print Network [OSTI]

    Wurtele, Jonathan

    HARMONIC CASCADE FEL DESIGNS FOR LUX, A FACILTY FOR ULTRAFAST X-RAY SCIENCE J. Corlett, W. Fawley. We also discuss lattice considerations pertinent to harmonic cascade FELs, somesensitivity studies. While much of this effort has been concentrated upon SASE-based FEL's, there is an alternative "harmonic

  9. Contributions to the FEL2000 Conference, August 13-18, 2000 in Durham, North Carolina USA

    E-Print Network [OSTI]

    Contributions to the FEL2000 Conference, August 13-18, 2000 in Durham, North Carolina USA October 2000, TESLA-FEL 2000-05 #12;Contents B. Faatz, J. P uger, DESY, Germany Di erent focusing solutions for the TTF-FEL undulator: : : : : : : : : : : : : : : : : : : : : 1 B. Faatza, A.A. Fateevb, J. Feldhausa, J

  10. Manufacturing Considerations of the Magnetic Structures for the Undulators for the X-FEL at TESLA

    E-Print Network [OSTI]

    1 Manufacturing Considerations of the Magnetic Structures for the Undulators for the X-FEL at TESLA DESY / HASYLAB Notkestr. 85, 22607 Hamburg, Germany TESLA-FEL 2000-10 Abstract A study is presented FELs. The total magnetic length of the magnet structures is 1405m. It is proposed to produce these huge

  11. FEL3330 Networked and Multi-Agent Control Lecture 11: Distributed Estimation

    E-Print Network [OSTI]

    Dimarogonas, Dimos

    FEL3330 Networked and Multi-Agent Control Systems Lecture 11: Distributed Estimation Distributed Estimation Distributed Localization FEL3330, Lecture 11 1 June 8, 2011 #12;Distributed Estimation is from the fact that P-1^x = HR-1 V y. FEL3330, Lecture 11 2 June 8, 2011 #12;Distributed Estimation Each

  12. FEL3330/EL2910 Networked and Multi-Agent Control Systems

    E-Print Network [OSTI]

    Dimarogonas, Dimos

    FEL3330/EL2910 Networked and Multi-Agent Control Systems Spring 2013 Automatic Control School of Electrical Engineering Royal Institute of Technology Lecture 1 1 May 6, 2013 #12;FEL3330/EL2910 Networked #12;FEL3330/EL2910 Networked and Multi-Agent Control Systems Lecture 1: Introduction · Practical

  13. TESLA FEL Report 200602 Finite Element Analyses for RF Photoinjector Gun Cavities

    E-Print Network [OSTI]

    TESLA FEL Report 200602 Finite Element Analyses for RF Photoinjector Gun Cavities F. Marhauser BESSY GmbH #12;TESLA FEL Report 200602 Contents 1. INTRODUCTION......................................................................................................................................................28 #12;TESLA FEL Report 200602 Finite Element Analyses for RF Photoinjector Gun Cavities F

  14. Coherence and Linewidth Studies of a 4-nm High Power FEL

    E-Print Network [OSTI]

    Fawley, W.M.

    2008-01-01

    bandwidth for a single-pass FEL amplifier initiated by SASE.Studies of a 4-nm High Power FEL W.M. Fawley, A.M. Sessler,Studies of a 4-nm High Power FEL W. M. Fawley and A. M.

  15. HIGH GAIN FEL AMPLIFICATION OF CHARGE MODULATION CAUSED BY A HADRON *

    E-Print Network [OSTI]

    HIGH GAIN FEL AMPLIFICATION OF CHARGE MODULATION CAUSED BY A HADRON * Vladimir N. Litvinenko in a high gain FEL. The resulting amplified modulation of electron beam, its shape, form and its lethargy]). We also discuss the influence of the electron beam parameters on the FEL response. INTRODUCTION

  16. STATUS OF LBL/LLNL FEL RESEARCH FOR TWO BEAM ACCELERATOR APPLICATIONS

    E-Print Network [OSTI]

    Hopkins, D.B.

    2008-01-01

    of a High Gain Microwave FEL Operating at 140 GHz", Nucl.Radio Frequency Phase in the FEL Section of a TBA", Proc. ofD. B. Hopkins, et aI, "An FEL Power Source for a TeV Linear

  17. Sample -PDF FEL.doc 2012-04-18 THE UNIVERSITY OF BRITISH COLUMBIA

    E-Print Network [OSTI]

    Strynadka, Natalie

    Sample - PDF FEL.doc 2012-04-18 THE UNIVERSITY OF BRITISH COLUMBIA - FACULTY APPOINTMENT FORM GRANT % AMOUNT (mandatory) ANNUAL AMOUNT (Optional)Monthly Per Period 2012-12-01 2013-11-30 FEL FAKE covered by FEL, will need BEN line - Only one PG can cover benefits - BEN line needed even if PDF

  18. Field Accuracy Requirements for the Undulator Systems of the X-ray FEL's at TESLA

    E-Print Network [OSTI]

    Field Accuracy Requirements for the Undulator Systems of the X-ray FEL's at TESLA B. Faatz, J. 85, 22607 Hamburg, Germany Abstract In SASE FELs, the radiation power has to saturate in a single. The influence of the electron beam quality has been studied in detail in many papers. For the TESLA X-ray FEL

  19. A HIGH REPETITION RATE VUV-SOFT X-RAY FEL CONCEPT* J. Corlett#

    E-Print Network [OSTI]

    Wurtele, Jonathan

    A HIGH REPETITION RATE VUV-SOFT X-RAY FEL CONCEPT* J. Corlett# , J. Byrd, W. M. Fawley, M. Gullans, Berkeley, CA 94720, U.S.A. Abstract We report on design studies for a seeded FEL light source that is responsive to the scientific needs of the future. The FEL process increases radiation flux by several orders

  20. Undulators for the BESSY SASE-FEL Project

    SciTech Connect (OSTI)

    Bahrdt, J.; Frentrup, W.; Gaupp, A.; Kuske, B.; Meseck, A.; Scheer, M.

    2004-05-12

    BESSY plans to build a SASE-FEL facility for the energy range from 20 eV to 1000 eV. The energy range will be covered by three APPLE II type undulators with a magnetic length of about 60 m each. This paper summarizes the basic parameters of the FEL-undulators. The magnetic design will be presented. A modified APPLE II design will be discussed which provides higher fields at the expense of reduced horizontal access. GENESIS simulations give an estimate on the tolerances for the beam wander and for gap errors.

  1. Proceedings of the 2007 Aging Aircraft Conference Cost Model for Assessing the Transition to Lead-Free Electronics

    E-Print Network [OSTI]

    Sandborn, Peter

    Proceedings of the 2007 Aging Aircraft Conference Cost Model for Assessing the Transition to Lead the cost ramifications of the transition from tin- lead to lead-free electronic parts. All tin-lead, all lead-free and mixed assembly approaches are considered. The model makes basic assumptions of a fixed

  2. Energy of the quasi-free electron in low density Ar and Kr: Extension of the local

    E-Print Network [OSTI]

    Findley, Gary L.

    Energy of the quasi-free electron in low density Ar and Kr: Extension of the local Wigner induced shift of the CH3I ion- ization energy at low perturber number densities and analyze these data­15]. In both regions, the perturber-induced energy shift (P), where P is the perturber number density

  3. First Lasing of Volume FEL (VFEL) at Wavelength Range $?\\sim $ 4-6 mm

    E-Print Network [OSTI]

    V. Baryshevsky; K. Batrakov; A. Gurinovich; I. Ilienko; A. Lobko; V. Moroz; P. Sofronov; V. Stolyarsky

    2001-07-18

    First lasing of volume free electron laser (VFEL) is described. The generating system consists of two metal diffraction grating with different spatial periods. The first grating creates the conditions for Smith Purcell emission mechanism. The second grating provides the distributed feedback for emitted wave. The length of diffraction grating is 10 cm. Electron beam pulse with a time duration $\\tau \\sim$ 10 ms has a sinusoidal form with the amplitude varied from 1 to ~10 kV. The measured microwave power reached the value of about 3-4 W in mm wavelength range. The generation stops at threshold current value. When the current tends to the threshold value, the region of generation tends to a narrow band near to 5 kV. At higher current values the radiation appears in electron energy range 5 - 7.5 KeV.

  4. ARCHITECTURE AND MAIN HARDWARE COMPONENTS OF THE FEL CONTROL SYSTEM

    E-Print Network [OSTI]

    Kozak, Victor R.

    ARCHITECTURE AND MAIN HARDWARE COMPONENTS OF THE FEL CONTROL SYSTEM E.N. Dementiev, V.R. Kozak, E general structure and listing the main features and hardware of individual components. Comparative as the reasons for choosing certain standards. Main issues of the future development of the control system

  5. THE NOVOSIBIRSK TERAHERTZ FEL FACILITY CURRENT STATUS AND FUTURE PROSPECTS*

    E-Print Network [OSTI]

    Kozak, Victor R.

    . The third FEL will be installed on the fourth orbit. In this paper we report the latest results obtained ­ bending magnets, 4 ­ undulator, 5 ­ dump. Multiturn ERLs look very promising for making ERLs less. The 180-degree bending arcs also include small bending magnets with parallel edges and quadrupoles

  6. CLIC Drive Beam and LHC Based Fel-Nucleus Collider

    E-Print Network [OSTI]

    H. Braun; R. Corsini; S. Sultansoy; O. Yavas

    2005-08-09

    The feasibility of a CLIC-LHC based FEL-nucleus collider is investigated. It is shown that the proposed scheme satisfies all requirements of an ideal photon source for the Nuclear Resonance Fluorescence method. The physics potential of the proposed collider is illustrated for a beam of Pb nuclei.

  7. The Linac Coherent Light Source

    DOE Public Access Gateway for Energy & Science Beta (PAGES Beta)

    White, William E.; Robert, Aymeric; Dunne, Mike

    2015-05-01

    The Linac Coherent Light Source (LCLS) at the SLAC National Accelerator Laboratory was the first hard X-ray free-electron laser (FEL) to operate as a user facility. After five years of operation, LCLS is now a mature FEL user facility. Our personal views about opportunities and challenges inherent to these unique light sources are discussed.

  8. COMMISSIONING STATUS AND FURTHER DEVELOPMENT OF THE NOVOSIBIRSK MULTITURN ERL*

    E-Print Network [OSTI]

    Kozak, Victor R.

    The Novosibirsk ERL is used as a source of electron beams for the powerful Free Electron Laser. It is based of the Novosibirsk ERL and FEL facility. ACCELERATOR DESIGN The Novosibirsk FEL facility is based on the multiturn at the ceiling. At the common track there are two round magnets. By switching these magnets on and off one can

  9. The FERMI @ Elettra Technical Optimization Study: General Layout and Parameters and Physics Studies of Longitudinal Space Charge, the Spreader, the Injector, and Preliminary FEL Performance

    E-Print Network [OSTI]

    2005-01-01

    Studies of the FERMI at ELETTRA FEL Design”, G. De Ninno, B.very preliminary GENESIS runs of FEL-II output are shown infigures show a summary of runs FEL-II at 10 nm. Tapering is

  10. Macro-particle FEL model with self-consistent spontaneous radiation

    E-Print Network [OSTI]

    Litvinenko, Vladimir N

    2015-01-01

    Spontaneous radiation plays an important role in SASE FELs and storage ring FELs operating in giant pulse mode. It defines the correlation function of the FEL radiation as well as its many spectral features. Simulations of these systems using randomly distributed macro-particles with charge much higher that of a single electron create the problem of anomalously strong spontaneous radiation, limiting the capabilities of many FEL codes. In this paper we present a self-consistent macro-particle model which provided statistically exact simulation of multi-mode, multi-harmonic and multi-frequency short-wavelength 3-D FELs including the high power and saturation effects. The use of macro-particle clones allows both spontaneous and induced radiation to be treated in the same fashion. Simulations using this model do not require a seed and provide complete temporal and spatial structure of the FEL optical field.

  11. DRIVER ACCELERATOR DESIGN FOR THE 10 KW UPGRADE OF THE JEFFERSON LAB IR FEL

    E-Print Network [OSTI]

    DRIVER ACCELERATOR DESIGN FOR THE 10 KW UPGRADE OF THE JEFFERSON LAB IR FEL D. Douglas, S. V, Newport News, VA23606, USA Abstract An upgrade of the Jefferson Lab IR FEL [1] is now un- der construction. It will provide 10 kW output light power in a wavelength range of 2­10 µm. The FEL will be driven by a modest

  12. TESLA-FEL 2004-05 The Potential for Extending the Spectral

    E-Print Network [OSTI]

    TESLA-FEL 2004-05 The Potential for Extending the Spectral Range Accessible to the European X electron beam energy of 17.5 GeV can be covered by operating the SASE FEL with three undulators which have. There are at least two possible sources of the VUV radiation associated with the X-ray FEL: the "low (2.5 GeV) energy

  13. Lasers

    SciTech Connect (OSTI)

    1995-01-01

    The scope of our research in laser and related technologies has grown over the years and has attracted a broad user base for applications within DOE, DOD, and private industry. Within the next few years, we expect to begin constructing the National Ignition Facility, to make substantial progress in deploying AVLIS technology for uranium and gadolinium enrichment, and to develop new radar sensing techniques to detect underwater objects. Further, we expect to translate LLNL patent ideas in microlithography into useful industrial products and to successfully apply high-power, diode-based laser technology to industrial and government applications.

  14. Design, analysis, and testing of a high thermal conductivity waveguide window for use in a free-electron laser

    SciTech Connect (OSTI)

    T. Schultheiss; V. Christina; M. Cole; J. Rathke; T. Elliott; V. Nguyen; L. Phillips; J. Preble

    1998-08-01

    Design, analysis and testing of a waveguide window with a goal of propagating greater than 100 kW average power operating at 1500 Mhz has been performed. This is made possible by the favorable material properties of Beryllia (BeO). Brazing the window to a soft copper frame and then brazing the frame to a KOVAR flange provides the vacuum seal. RF analysis combined with thermal/structural analysis shows the benefits of the material. The KOVAR flange with a CTE,coefficient of thermal expansion, that matches that of BeO enables a strong braze joint. RF testing to 35 kW has been successful, and higher powers will be tested in the near future. The basics of this design can be expanded to applications with lower frequencies and higher average power.

  15. Accelerator Design Study for a Soft X-Ray Free Electron Laser at the Lawrence Berkeley National Laboratory

    E-Print Network [OSTI]

    Kur, E.

    2010-01-01

    Newsletter, N38, Ed. I.S. Ko. Dowell D. H. , Hayward T. D. ,compression can be achieved [Dowell et al. ] by correcting

  16. Multicolor operation and spectral control in a gain-modulated x-ray free-electron laser

    E-Print Network [OSTI]

    2013-01-01

    Coherent Light Source (LCLS, at SLAC) [1], SACLA (RIKEN) [experimental demonstration at LCLS. FIG. 1 (color online).demonstrated experimentally at LCLS. The experimental beam

  17. Pixel array detector for X-ray free electron laser experiments Hugh T. Philipp a,, Marianne Hromalik c

    E-Print Network [OSTI]

    Gruner, Sol M.

    Source (LCLS) at the SLAC National Laboratory [3]. The detector features 14-bit in-pixel digitization Coherent Light Source (LCLS). The PAD was made by fabricating custom CMOS electronics using a commercial 0

  18. Common Analysis of the Relativistic Klystron and the Standing-Wave Free-Electron Laser Two-Beam Accelerator

    E-Print Network [OSTI]

    Wurtele, Jonathan S.

    2008-01-01

    Powered by a Relativistic Klystron", Phys. Rev. Lett. 11.Analysis the Relativistic Klystron and the Standing-WaveANALYSIS OF THE RELATIVISTIC KLYSTRON AND THE STANDING-WAVE

  19. Theoretical Examination of Transfer Cavities in a Standing-wave Free-electron Laser Two-beam Accelerator

    E-Print Network [OSTI]

    Govil, R.

    2008-01-01

    Analysis of the Relativistic Klystron and the Standing-Waveboth in the relativistic klystron version (RK/TBA) and thewith a relativistic klystron (RK) or a standing-wave free-

  20. Two-Dimensional Simulation Analysis of the Standing-wave Free-electron Laser Two-Beam Accelerator

    E-Print Network [OSTI]

    Wang, C.

    2008-01-01

    and S. Yu, "Relativistic klystron simulations using RKTW2D,"dimensional relativistic klystron code, developed by Ryneand the relativistic klystron two-beam accelerator. In this

  1. Modern problems in Statistical Physics of Bose-Einstein Condensation and in Electrodynamics of Free Electron Lasers 

    E-Print Network [OSTI]

    Dorfman, Konstantin E.

    2010-07-14

    In this dissertation, I have studied theoretical problems in statistical physics and electrodynamics of Bose particles, namely, mesoscopic effects in statistics of Bose- Einstein condensate (BEC) of atoms and electromagnetic ...

  2. Two-Bunch Self-Seeding for Narrow-Bandwidth Hard X-Ray Free-Electron Lasers

    Office of Scientific and Technical Information (OSTI)

    AFDC Printable Version Share this resource Send a link to EERE: Alternative Fuels Data Center Home Page to someone by E-mail Share EERE: Alternative Fuels Data Center Home Page on Facebook Tweet about EERE: Alternative Fuels Data Center Home Page on Twitter Bookmark EERE: Alternative Fuels Data Center Homesum_a_epg0_fpd_mmcf_m.xls" ,"Available from WebQuantity of NaturalDukeWakefield MunicipalTechnicalInformation FederatedInformationTITLE:Connect Transportation(Journal

  3. Two-Bunch Self-Seeding for Narrow-Bandwidth Hard X-Ray Free-Electron Lasers

    Office of Scientific and Technical Information (OSTI)

    AFDC Printable Version Share this resource Send a link to EERE: Alternative Fuels Data Center Home Page to someone by E-mail Share EERE: Alternative Fuels Data Center Home Page on Facebook Tweet about EERE: Alternative Fuels Data Center Home Page on Twitter Bookmark EERE: Alternative Fuels Data Center Homesum_a_epg0_fpd_mmcf_m.xls" ,"Available from WebQuantity of NaturalDukeWakefield MunicipalTechnicalInformation FederatedInformationTITLE:Connect

  4. GA-FEL Spreadsheet Instructions 1. Please complete and submit this form electronically (as an attachment) to

    E-Print Network [OSTI]

    Farritor, Shane

    GA-FEL Spreadsheet Instructions 1. Please complete and submit this form electronically (as TUITION &/OR FEES BEGIN AND END WAIVED Due to FEL DATES Beginning Date Ending Date Number of Payments

  5. Towards Predicting Biomechanical Consequences of Jaw Reconstruction Ian Stavness, Alan G. Hannam, John E. Lloyd, and Sidney Fels

    E-Print Network [OSTI]

    British Columbia, University of

    , John E. Lloyd, and Sidney Fels Abstract-- We are developing dynamic computer models of surgical jaw examination of the biomechanics of surgically reconstructed anatomy I. Stavness, J. Lloyd, and S. Fels

  6. R&D Requirements, RF Gun Mode Studies, FEL-2 Steady-StateStudies, Preliminary FEL-1 Time-Dependent Studies, and Preliminary LayoutOption Investigation

    SciTech Connect (OSTI)

    Byrd, John; Corlett, John; Doolittle, Larry; Fawley, William; Lidia, Steven; Penn, Gregory; Ratti, Alex; Staples, John; Wilcox Russell; Wurtele, Jonathan; Zholents, Alexander

    2005-10-01

    This report constitutes the third deliverable of LBNLs contracted role in the FERMI {at} Elettra Technical Optimization study. It describes proposed R&D activities for the baseline design of the Technical Optimization Study, initial studies of the RF gun mode-coupling and potential effects on beam dynamics, steady-state studies of FEL-2 performance to 10 nm, preliminary studies of time-dependent FEL-1 performance using electron bunch distribution from the start-to-end studies, and a preliminary investigation of a configuration with FEL sinclined at a small angle from the line of the linac.

  7. Optimization of the LCLS X-ray FEL output performance in the presence of strong undulator wakefields

    E-Print Network [OSTI]

    Reiche, S; Emma, P; Fawley, W M; Huang, Z; Nuhn, H D; Stupakov, G V

    2005-01-01

    Optimization of the LCLS X-ray FEL output performance in the presence of strong undulator wakefields

  8. Development of a Femtosecond Soft X-ray SASE FEL at W. Brefelda, B. Faatza, J. Feldhausa, M. Korfera,

    E-Print Network [OSTI]

    Development of a Femtosecond Soft X-ray SASE FEL at DESY W. Brefelda, B. Faatza, J. Feldhausa, M of the soft X-ray SASE FEL at the TESLA Test Facility (TTF) at DESY for generation of femtosecond pulses cant fraction of the electron beam due to the FEL interaction process, and only a small part

  9. PHOTON BEAM DIAGNOSTICS FOR VISA FEL , C. Pellegrini, J. Rosenzweig, P. Frigola, P. Musumeci, A. Tremaine, UCLA

    E-Print Network [OSTI]

    Brookhaven National Laboratory

    PHOTON BEAM DIAGNOSTICS FOR VISA FEL A. Murokh , C. Pellegrini, J. Rosenzweig, P. Frigola, P@stout.physics.ucla.edu Abstract The VISA (Visible to Infrared SASE Amplifier) project is designed to be a SASE-FEL driven and spectral distribution of the FEL light at the exit and inside of the undulator; electron beam micro

  10. Influence of different focusing solutions for the TESLA X-ray FEL's on debunching of the electron beam

    E-Print Network [OSTI]

    Influence of different focusing solutions for the TESLA X-ray FEL's on debunching of the electron), Notkestr. 85, 22607 Hamburg, Germany Abstract For SASE-FELs the total undulator length increases different types of focusing for the TESLA X-ray FEL parameters will be discussed. 1. Introduction The TESLA

  11. Femtosecond X-ray Absorption Spectroscopy at a Hard X-ray Free Electron

    Office of Scientific and Technical Information (OSTI)

    AFDC Printable Version Share this resource Send a link to EERE: Alternative Fuels Data Center Home Page to someone by E-mail Share EERE: Alternative Fuels Data Center Home Page on Facebook Tweet about EERE: Alternative Fuels Data Center Home Page on Twitter Bookmark EERE: Alternative Fuels Data Center Homesum_a_epg0_fpd_mmcf_m.xls" ,"Available from WebQuantity of NaturalDukeWakefieldSulfate Reducing(Journal Article) |production at aSciTech Connect Fe AtomicSciTechLaser: Application

  12. Goniometer-based femtosecond crystallography with X-ray free electron

    Office of Scientific and Technical Information (OSTI)

    AFDC Printable Version Share this resource Send a link to EERE: Alternative Fuels Data Center Home Page to someone by E-mail Share EERE: Alternative Fuels Data Center Home Page on Facebook Tweet about EERE: Alternative Fuels Data Center Home Page on Twitter Bookmark EERE: Alternative Fuels Data Center Homesum_a_epg0_fpd_mmcf_m.xls" ,"Available from WebQuantity of NaturalDukeWakefieldSulfate Reducing(Journal Article)lasers (Journal Article) | SciTech Connect González, Ana ; Aguila,

  13. Goniometer-based femtosecond crystallography with X-ray free electron

    Office of Scientific and Technical Information (OSTI)

    AFDC Printable Version Share this resource Send a link to EERE: Alternative Fuels Data Center Home Page to someone by E-mail Share EERE: Alternative Fuels Data Center Home Page on Facebook Tweet about EERE: Alternative Fuels Data Center Home Page on Twitter Bookmark EERE: Alternative Fuels Data Center Homesum_a_epg0_fpd_mmcf_m.xls" ,"Available from WebQuantity of NaturalDukeWakefieldSulfate Reducing(Journal Article)lasers (Journal Article) | SciTech Connect González, Ana ;

  14. Pulse energy measurement at the hard x-ray laser in Japan

    SciTech Connect (OSTI)

    Kato, M.; Tanaka, T.; Saito, N.; Kurosawa, T.; Richter, M.; Sorokin, A. A.; Tiedtke, K.; Kudo, T.; Yabashi, M.; Tono, K.; Ishikawa, T.

    2012-07-09

    The pulse energies of a free electron laser have accurately been measured in the hard x-ray spectral range. In the photon energy regime from 4.4 keV to 16.8 keV, pulse energies up to 100 {mu}J were obtained at the hard x-ray laser facility SACLA (SPring-8 Angstrom Compact free-electron LAser). Two independent methods, using a cryogenic radiometer and a gas monitor detector, were applied and agreement within 3.3% was achieved. Based on our validated pulse energy measurement, a SACLA online monitor detector could be calibrated for all future experiments.

  15. Performance of an LPD prototype detector at MHz frame rates under Synchrotron and FEL radiation

    E-Print Network [OSTI]

    Koch, Andreas; Nicholls, Tim; Angelsen, Christian; Coughlan, John; French, Marcus; Hauf, Steffen; Kuster, Markus; Sztuk-Dambietz, Jolanta; Turcato, Monica; Carini, Gabriella A; Chollet, Matthieu; Herrmann, Sven C; Lemke, Henrik T; Nelson, Silke; Song, Sanghoon; Weaver, Matt; Zhu, Diling; Meents, Alke; Fischer, Pontus

    2013-01-01

    A MHz frame rate X-ray area detector (LPD - Large Pixel Detector) is under development by the Rutherford Appleton Laboratory for the European XFEL. The detector will have 1 million pixels and allows analogue storage of 512 images taken at 4.5 MHz in the detector front end. The LPD detector has 500 mm thick silicon sensor tiles that are bump bonded to a readout ASIC. The ASICs preamplifier provides relatively low noise at high speed which results in a high dynamic range of 10^5 photons over an energy range of 5-20 keV. Small scale prototypes of 32x256 pixels (LPD 2-Tile detector) and 256x256 pixels (LPD supermodule detector) are now available for X-ray tests. The performance of prototypes of the detector is reported for first tests under synchrotron radiation (PETRA III at DESY) and Free-Electron-Laser radiation (LCLS at SLAC). The initial performance of the detector in terms of signal range and noise, radiation hardness and spatial and temporal response are reported. The main result is that the 4.5 MHz sampli...

  16. Maximizing Spectral Flux from Self-Seeding Hard X-ray FELs

    E-Print Network [OSTI]

    Yang, Xi

    2013-01-01

    Fully coherent x-rays can be generated by self-seeding x-ray free-electron lasers (XFELs). Self-seeding by a forward Bragg diffraction (FBD) monochromator has been recently proposed [1] and demonstrated [2]. Characteristic time To of FBD determines the power, spectral, and time characteristics of the FBD seed [3]. Here we show that for a given electron bunch with duration sigma_e the spectral flux of the self-seeding XFEL can be maximized, and the spectral bandwidth can be respectively minimized by choosing To ~ sigma_e/pi and by optimizing the electron bunch delay tau_e. The choices of To and tau_e are not unique. In all cases, the maximum value of the spectral flux and the minimum bandwidth are primarily determined by sigma_e. Two-color seeding takes place To >> sigma_e/\\pi. The studies are performed, for a Gaussian electron bunch distribution with the parameters, close to those used in the short-bunch (sigma_e ~ 5 fs) and long-bunch (sigma_e ~ 20 fs) operation modes of the LCLS XFEL.

  17. Evolution of electron beam phase space distribution in a high-gain FEL

    SciTech Connect (OSTI)

    Webb,S.D.; Litvinenko, V. N.

    2009-08-23

    FEL-based coherent electron cooling (CEC) offers a new avenue to achieve high luminosities in high energy colliders such as RHIC, LHC, and eRHIC. Traditional treatments consider the FEL as an amplifier of optical waves with specific initial conditions, focusing on the resulting field. CEC requires knowledge of the phase space distribution of the electron beam in the FEL. We present 1D analytical results for the phase space distribution of an electron beam with an arbitrary initial current profile, and discuss approaches of expanding to 3D results.

  18. Polarization Analysis for Seeded FELs in a Crossed-Planar Undulator

    SciTech Connect (OSTI)

    Geng, Huiping; /SLAC; Ding, Yuantao; /SLAC; Huang, Zhirong; /SLAC; Bartolini, Riccardo; /Diamond Light Source; Dunning, David; /Daresbury; Thompson, Neil; /Daresbury

    2012-06-25

    The crossed-planar undulator is a promising scheme for full polarization control in x-ray FELs. For SASE FELs, it has been shown a maximum degree of circular polarization of about 80% is achievable at fundamental wavelength just before saturation. In this paper, we study the effectiveness of a crossed undulator for a seeded x-ray FEL. The degree of circular polarization for both the fundamental and the harmonic radiation are considered. Simulations with realistic beam distributions show that a degree of circular polarization of over 90% and 80% is obtainable at the fundamental and 2nd harmonic frequencies, respectively.

  19. Quantum field theory treatment of magnetic effects on the spin and orbital angular momentum of a free electron

    E-Print Network [OSTI]

    P. Kurian; C. Verzegnassi

    2015-08-01

    We consider in a quantum field theory framework the effects of a classical magnetic field on the spin and orbital angular momentum (OAM) of a free electron. We derive formulae for the changes in the spin and OAM due to the introduction of a general classical background field. We consider then a constant magnetic field, in which case the relevant expressions of the effects become much simpler and conversions between spin and OAM become readily apparent. An estimate of the expectation values for a realistic electron state is also given. Our findings may be of interest to researchers in spintronics and the field of quantum biology, where electron spin has been implicated on macroscopic time and energy scales.

  20. Ultrafast dynamics of nonequilibrium electrons in metals under femtosecond laser irradiation B. Rethfeld*

    E-Print Network [OSTI]

    von der Linde, D.

    Ultrafast dynamics of nonequilibrium electrons in metals under femtosecond laser irradiation B with an ultrashort laser pulse leads to a disturbance of the free-electron gas out of thermal equilibrium. We investigate theoretically the transient evolution of the distribution function of the electron gas in a metal

  1. Study of CSR Effects in the Jefferson Laboratory FEL Driver

    SciTech Connect (OSTI)

    Hall, C. C.; Biedron, S.; Burleson, Theodore A.; Milton, Stephen V.; Morin, Auralee L.; Benson, Stephen V.; Douglas, David R.; Evtushenko, Pavel E.; Hannon, Fay E.; Li, Rui; Tennant, Christopher D.; Zhang, Shukui; Carlsten, Bruce E.; Lewellen, John W.

    2013-08-01

    In a recent experiment conducted on the Jefferson Laboratory IR FEL driver the effects of Coherent Synchrotron Radiation (CSR) on beam quality were studied. The primary goal of this work was to explore CSR output and effect on the beam with variation of the bunch compression in the IR chicane. This experiment also provides a valuable opportunity to benchmark existing CSR models in a system that may not be fully represented by a 1-D CSR model. Here we present results from this experiment and compare to initial simulations of CSR in the magnetic compression chicane of the machine. Finally, we touch upon the possibility for CSR induced microbunching gain in the magnetic compression chicane, and show that parameters in the machine are such that it should be thoroughly damped.

  2. Ultraviolet radiation induced discharge laser

    DOE Patents [OSTI]

    Gilson, Verle A. (Livermore, CA); Schriever, Richard L. (Livermore, CA); Shearer, James W. (Livermore, CA)

    1978-01-01

    An ultraviolet radiation source associated with a suitable cathode-anode electrode structure, disposed in a gas-filled cavity of a high pressure pulsed laser, such as a transverse electric atmosphere (TEA) laser, to achieve free electron production in the gas by photoelectric interaction between ultraviolet radiation and the cathode prior to the gas-exciting cathode-to-anode electrical discharge, thereby providing volume ionization of the gas. The ultraviolet radiation is produced by a light source or by a spark discharge.

  3. Fabrication and characterization of cesium telluride photocathodes: A promising electron source for the Los Alamos Advanced FEL

    SciTech Connect (OSTI)

    Kong, S.H.; Nuguyen, D.C.; Sheffield, R.L.; Sherwood, B.A.

    1994-09-01

    The Advanced FEL at Los Alamos embodies a Y{sub 2}CsSb photocathode as an electron source. The photocathode consists of a K{sub 2}CsSb film deposited on a molybdenum plug that can be inserted into the linac of the FEL. However, because K{sub 2}CsSb is easily contaminated and has a half-life of less than a day when in use, switching to a more rugged high quantum efficiency (QE) material such as Cs{sub 2}Te is considered as a means to lengthen the beam time. Cs{sub 2}Te films were deposited on molybdenum plugs in an ultrahigh-vacuum research chamber. Several Cs{sub 2}Te films were measured in-situ for their spectral responses with a bias voltage of 90V; the resulting QEs were 12-18% at a wavelength of 254 nm, 0.2-1.2% at 334 nm, 10{sup {minus}4}-10{sup {minus}3} at 365 nm, and 10{sup {minus}7}-10{sup {minus}5} at 546 nm. For this cathode to be useful, the authors need to frequency quadruple the 1052 mn line of the Nd:YLF laser to achieve a wavelength of 263 mm. Initial studies showed that the 251-nm QE of Cs{sub 2}Te is much less sensitive to contamination than the 526-nm QE of K{sub 2}CsSb. The authors exposed Cs{sub 2}Te photocathodes to air at 10{sup {minus}4} torr for five minutes. As a result, the QEs dropped from 16-18% to 1-2% at 254 mn. However, heating the cathode to 165{degrees}C revived the QE to about 10%. They conclude that Cs{sub 2}Te is a very rugged photocathode material for use in an rf photoelectron source.

  4. Fast pulsed excitation wiggler or undulator

    DOE Patents [OSTI]

    van Steenbergen, Arie (Shoreham, NY)

    1990-01-01

    A fast pulsed excitation, electromagnetic undulator or wiggler, employing geometrically alternating substacks of thin laminations of ferromagnetic material, together with a single turn current loop excitation of the composite assembly, of such shape and configuration that intense, spatially alternating, magnetic fields are generated; for use as a pulsed mode undulator or wiggler radiator, for use in a Free Electron Laser (FEL) type radiation source or, for use in an Inverse Free Electron Laser (IFEL) charged particle accelerator.

  5. Light Well: ATunable Free-Electron Light Source on a Chip K. F. MacDonald,1,* Y. H. Fu,2

    E-Print Network [OSTI]

    Zheludev, Nikolay

    Light Well: ATunable Free-Electron Light Source on a Chip G. Adamo,1 K. F. MacDonald,1,* Y. H. Fu,2 metal-dielectric structure creates a new type of tunable, nanoscale radiation source--a ``light well''. In the reported demonstration, tunable light is generated at an intensity of $200 W=cm2 as electrons with energies

  6. Beam Size Measurement by Optical Diffraction Radiation and Laser System for Compton Polarimeter

    SciTech Connect (OSTI)

    Chuyu Liu

    2012-12-31

    Beam diagnostics is an essential constituent of any accelerator, so that it is named as "organs of sense" or "eyes of the accelerator." Beam diagnostics is a rich field. A great variety of physical effects or physical principles are made use of in this field. Some devices are based on electro-magnetic influence by moving charges, such as faraday cups, beam transformers, pick-ups; Some are related to Coulomb interaction of charged particles with matter, such as scintillators, viewing screens, ionization chambers; Nuclear or elementary particle physics interactions happen in some other devices, like beam loss monitors, polarimeters, luminosity monitors; Some measure photons emitted by moving charges, such as transition radiation, synchrotron radiation monitors and diffraction radiation-which is the topic of the first part of this thesis; Also, some make use of interaction of particles with photons, such as laser wire and Compton polarimeters-which is the second part of my thesis. Diagnostics let us perceive what properties a beam has and how it behaves in a machine, give us guideline for commissioning, controlling the machine and indispensable parameters vital to physics experiments. In the next two decades, the research highlight will be colliders (TESLA, CLIC, JLC) and fourth-generation light sources (TESLA FEL, LCLS, Spring 8 FEL) based on linear accelerator. These machines require a new generation of accelerator with smaller beam, better stability and greater efficiency. Compared with those existing linear accelerators, the performance of next generation linear accelerator will be doubled in all aspects, such as 10 times smaller horizontal beam size, more than 10 times smaller vertical beam size and a few or more times higher peak power. Furthermore, some special positions in the accelerator have even more stringent requirements, such as the interaction point of colliders and wigglor of free electron lasers. Higher performance of these accelerators increases the difficulty of diagnostics. For most cases, intercepting measurements are no longer acceptable, and nonintercepting method like synchrotron radiation monitor can not be applied to linear accelerators. The development of accelerator technology asks for simutanous diagnostics innovations, to expand the performance of diagnostic tools to meet the requirements of the next generation accelerators. Diffraction radiation and inverse Compton scattering are two of the most promising techniques, their nonintercepting nature avoids perturbance to the beam and damage to the instrumentation. This thesis is divided into two parts, beam size measurement by optical diffraction radiation and Laser system for Compton polarimeter. Diffraction radiation, produced by the interaction between the electric field of charged particles and the target, is related to transition radiation. Even though the theory of diffraction radiation has been discussed since 1960s, there are only a few experimental studies in recent years. The successful beam size measurement by optical diffraction radiation at CEBAF machine is a milestone: First of all, we have successfully demonstrated diffraction radiation as an effective nonintercepting diagnostics; Secondly, the simple linear relationship between the diffraction radiation image size and the actual beam size improves the reliability of ODR measurements; And, we measured the polarized components of diffraction radiation for the first time and I analyzed the contribution from edge radiation to diffraction radiation.

  7. Design and Commissioning Plan for a Laser Heater for FERMI@elettra

    SciTech Connect (OSTI)

    Zholents, Alexander A.; Qiang, J.; Venturini, M.; Wells,, R.; Wilcox, R.; Di Mitri, S.; Spampinati, S.; Penco, G.

    2008-10-25

    The purpose of a laser heater is to increase the electron beam uncorrelated energy spread as a way to control and ideally suppress the microbunching instability in the linac drive for x-rays FELs. We review the motivations for equipping FERMI with a laser heater and provide a specification for the basics parameters as well as a description of a practical layout including desired diagnostics provisions for both the electron and laser beams. We also outline some useful operational guidelines for commissioning.

  8. Accelerator Development @ Daresbury Laboratory

    E-Print Network [OSTI]

    -injectors ­ Superconducting RF acceleration ­ Cryogenic systems ­ Advanced diagnostics ­ Free Electron Lasers ­ Photon beam radioisotopes. 2 Treatment & Diagnostics #12;Basic Accelerator Configuration 3 Beam Source Low Energy Capture electron beam technology development. 4 Booster Compressor IR-FEL Photoinjector Laser Linac Acceleration

  9. Design and test of SX-FEL cavity BPM

    E-Print Network [OSTI]

    Yuan, Renxian; Chen, Zhichu; Yu, Luyang; Wang, Baopen; Leng, Yongbin

    2013-01-01

    This paper reports the design and cold test of the cavity beam position monitor (CBPM) for SX-FEL to fulfill the requirement of beam position measurement resolution of less than 1{\\mu}m, even 0.1{\\mu}m. The CBPM was optimized by using a coupling slot to damp the TM010 mode in the output signal. The isolation of TM010 mode is about 117dB, and the shunt impedance is about 200{\\Omega}@4.65GHz with the quality factor 80 from MAFIA simulation and test result. A special antenna was designed to load power for reducing excitation of other modes in the cavity. The resulting output power of TM110 mode was about 90mV/mm when the source was 6dBm, and the accomplishable minimum voltage was about 200{\\mu}V. The resolution of the CBPM was about 0.1{\\mu}m from the linear fitting result based on the cold test.

  10. X-band photoinjector for a chirped-pulse FEL

    SciTech Connect (OSTI)

    Landahl, E. C.; Alvis, R. M.; Troha, A. L.; Hartemann, F. V.; Baldis, H. A. [Applied Science Department, University of California, Davis California 95616 (United States); Institute for Laser Science and Applications, LLNL, Livermore, California 94550 (United States); Le Sage, G. P.; White, W. E. [Lawrence Livermore National Laboratory, Livermore, California 94550 (United States); Bennett, C. V. [Electrical Engineering Department, University of California, Los Angeles, California 90024 (United States); Li, K.; Heritage, J. P. [Electrical and Computer Engineering Department, University of California, Davis, California (United States); Ho, C. H. [Synchrotron Radiation Research Center, Taiwan (China); Luhmann, N. C. Jr. [Applied Science Department, University of California, Davis California 95616 (United States)

    1999-05-07

    The phase noise and jitter characteristics of the laser and rf systems of a high gradient X-band photoinjector have been measured experimentally. The laser oscillator is a self-modelocked Titanium:Sapphire system operating at the 108th subharmonic of the rf gun. The X-band signal is produced from the laser by a phase-locked dielectric resonance oscillator, and amplified by a pulsed TWT and klystron. A comparison between the klystron and TWT amplifier phase noise and the fields excited in the rf gun demonstrates the filtering effect of the high Q structure, thus indicating that the rf gun can be used as a master oscillator, and could be energized by either a rf oscillator such as a magnetron or a compact source such as a cross-field amplifier. In particular, the rf gun can play the role of a pulsed rf clock to synchronize the photocathode laser system: direct drive of a synchronously modelocked AlGaAs quantum well laser has been achieved using the X-band gun rf fields. This novel, GHz repetition rate, laser system is being developed to replace the more conventional femtosecond Ti:Al{sub 2}O{sub 3} system. Some advantages include pumping this laser with a stabilized current source instead of a costly, low efficiency pump laser. Finally, dark current measurements and initial photoelectron measurements are reported.

  11. X-band photoinjector for a chirped-pulse FEL

    SciTech Connect (OSTI)

    Landahl, E.C.; Alvis, R.M.; Troha, A.L.; Hartemann, F.V.; Baldis, H.A.; Luhmann, N.C. Jr. [Applied Science Department, University of California, Davis , California 95616 (United States); Landahl, E.C.; Alvis, R.M.; Troha, A.L.; Hartemann, F.V.; Baldis, H.A. [Institute for Laser Science and Applications, LLNL, Livermore, California 94550 (United States); Le Sage, G.P.; White, W.E. [Lawrence Livermore National Laboratory, Livermore, California 94550 (United States); Bennett, C.V. [Electrical Engineering Department, University of California, Los Angeles, California 90024 (United States); Li, K.; Heritage, J.P. [Electrical and Computer Engineering Department, University of California, Davis, California (United States); Ho, C.H. [Synchrotron Radiation Research Center (Taiwan)

    1999-05-01

    The phase noise and jitter characteristics of the laser and rf systems of a high gradient X-band photoinjector have been measured experimentally. The laser oscillator is a self-modelocked Titanium:Sapphire system operating at the 108th subharmonic of the rf gun. The X-band signal is produced from the laser by a phase-locked dielectric resonance oscillator, and amplified by a pulsed TWT and klystron. A comparison between the klystron and TWT amplifier phase noise and the fields excited in the rf gun demonstrates the filtering effect of the high Q structure, thus indicating that the rf gun can be used as a master oscillator, and could be energized by either a rf oscillator such as a magnetron or a compact source such as a cross-field amplifier. In particular, the rf gun can play the role of a pulsed rf clock to synchronize the photocathode laser system: direct drive of a synchronously modelocked AlGaAs quantum well laser has been achieved using the X-band gun rf fields. This novel, GHz repetition rate, laser system is being developed to replace the more conventional femtosecond Ti:Al{sub 2}O{sub 3} system. Some advantages include pumping this laser with a stabilized current source instead of a costly, low efficiency pump laser. Finally, dark current measurements and initial photoelectron measurements are reported. {copyright} {ital 1999 American Institute of Physics.}

  12. The Model 5000-16C 1000 WATT FEL Lamp Standard pro-vides absolute calibration of spectral irradiance from 250 nm to

    E-Print Network [OSTI]

    The Model 5000-16C 1000 WATT FEL Lamp Standard pro- vides absolute calibration of spectral irradiance from 250 nm to 2.5 microns.This Tungsten-Halogen Lamp Standard bears the ANSI designation of FEL might be discernible at the crossover point of the two referenced NIST Scales. 5000 FEL 1000Watt Lamp

  13. Beam Based Alignment of the TESLA X-ray FEL undulators Deutsches Elektronen-Synchrotron (DESY), Notkestr. 85, 22607 Hamburg, Germany

    E-Print Network [OSTI]

    Beam Based Alignment of the TESLA X-ray FEL undulators B. Faatz Deutsches Elektronen the performance of the FEL is the overlap between electron beam and radiation field during the amplification The TESLA X-ray FEL laboratory is a proposed user facility in the wavelength range between ¼ Å and 6 nm

  14. InvenTcl: Making Open Inventor Interpretive with Tcl/[incr Tcl] Sidney Fels, Silvio Esser, Armin Bruderlin, Kenji Mase

    E-Print Network [OSTI]

    Fels, Sidney S.

    InvenTcl: Making Open Inventor Interpretive with Tcl/[incr Tcl] Sidney Fels, Silvio Esser, Armin: fels@mic.atr.co.jp Open Inventor is an object oriented 3D graphics toolkit written in C++. Because Open/compile/debug iteration cycle. In this sketch, we introduce InvenTcl which is an interpretive version of Open Inventor

  15. Optical laser systems at the Linac Coherent Light Source

    DOE Public Access Gateway for Energy & Science Beta (PAGES Beta)

    Minitti, Michael P.; Robinson, Joseph S.; Coffee, Ryan N.; Edstrom, Steve; Gilevich, Sasha; Glownia, James M.; Granados, Eduardo; Hering, Philippe; Hoffmann, Matthias C.; Miahnahri, Alan; et al

    2015-04-22

    Ultrafast optical lasers play an essential role in exploiting the unique capabilities of recently commissioned X-ray free-electron laser facilities such as the Linac Coherent Light Source (LCLS). Pump–probe experimental techniques reveal ultrafast dynamics in atomic and molecular processes and reveal new insights in chemistry, biology, material science and high-energy-density physics. This manuscript describes the laser systems and experimental methods that enable cutting-edge optical laser/X-ray pump–probe experiments to be performed at LCLS.

  16. A photocathode rf gun design for a mm-wave linac-based FEL

    SciTech Connect (OSTI)

    Nassiri, A.; Berenc, T,; Foster, J.; Waldschmidt, G.; Zhou, J.

    1995-07-01

    In recent years, advances in the rf gun technology have made it possible to produce small beam emittances suitable for short period microundulators which take advantage of the low emittance beam to reduce the wavelength of FELs. At the Advanced Photon Source, we are studying the design of a compact 50-MeV superconducting mm-wave linac-based FEL for the production of short wavelengths ({approximately}300 nm) to carry out FEL demonstration experiments. The electron source considered for the linac is a 30- GHz, 3 1/2-cell {pi}-mode photocathode rf gun. For cold model rf measurements a 15-GHz prototype structure was fabricated. Here we report on the design, numerical modelling and the initial cold-model rf measurement results on the 15-GHz prototype structure.

  17. Using The SLAC Two-Mile Accelerator for Powering an FEL

    SciTech Connect (OSTI)

    Barletta, W.A.; Sessler, A.M.; Yu, L.H.; /Brookhaven

    2012-06-29

    A parameter survey is made, employing the recently developed 2D formalism for an FEL, of the characteristics of an FEL using the SLAC accelerator. Attention is focused upon a wavelength of 40 {angstrom} (the water window) and 1 {angstrom} case is also presented. They consider employing the SLAC linac with its present operating parameters and with improved parameters such as would be supplied by a new photo-cathode injector. They find that improved parameters are necessary, but that the parameters presently achieved with present-day photo-cathode guns are adequate to reach the water window.

  18. CLIC-LHC Based FEL-Nucleus Collider: Feasibility and Physics Search Potential

    E-Print Network [OSTI]

    H. Braun; R. Corsini; J. P. Delahaye; E. Guliyev; A. Ozcan; S. Sultansoy; O. Yavas; S. Yigit

    2005-03-25

    The feasibility of a CLIC-LHC based FEL-nucleus collider is investigated. It is shown that the proposed scheme satisfies all requirements of an ideal photon source for the Nuclear Resonance Fluorescence method. The tunability, monochromaticity and high polarization of the FEL beam together with high statistics and huge energy of LHC nucleus beams will give an unique opportunity to determine different characteristics of excited nuclear levels. The physics potential of the proposed collider is illustrated for a beam of Pb nuclei.

  19. FEL GAIN LENGTH AND TAPER MEASUREMENTS AT LCLS

    E-Print Network [OSTI]

    Ratner, D.

    2010-01-01

    taper mea- surements from LCLS. We ?nd gain lengths of ? 2.9AND TAPER MEASUREMENTS AT LCLS ? D. Ratner † , A. Brachmann,et al. , First Results of the LCLS Laser-Heater Sys- tem,

  20. TESLA-FEL 2004-01 Silica Aerogel Radiators for Bunch Length

    E-Print Network [OSTI]

    TESLA-FEL 2004-01 Silica Aerogel Radiators for Bunch Length Measurements J. B¨ahr a , V. Djordjadze aerogel are used to measure the electron bunch length at the photo injector test facility at DESY Zeuthen by the usage of aerogel is calculated analytically and Monte Carlo simulations are performed. It is shown