skip to main content
OSTI.GOV title logo U.S. Department of Energy
Office of Scientific and Technical Information

Title: Attainment of Electron Beam Suitable for Medium Energy Electron Cooling

Abstract

Electron cooling of charged particle beams is a well-established technique at electron energies of up to 300 keV. However, up to the present time the advance of electron cooling to the MeV-range energies has remained a purely theoretical possibility. The electron cooling project at Fermilab has recently demonstrated the ¯rst cooling of 8.9 GeV/c antiprotons in the Recycler ring, and therefore, has proved the validity of the idea of relativistic electron cool- ing. The Recycler Electron Cooler (REC) is the key component of the Teva- tron Run II luminosity upgrade project. Its performance depends critically on the quality of electron beam. A stable electron beam of 4.3 MeV car- rying 0.5 A of DC current is required. The beam suitable for the Recycler Electron Cooler must have an angular spread not exceeding 200 ¹rad. The full-scale prototype of the REC was designed, built and tested at Fermilab in the Wideband laboratory to study the feasibility of attaining the high-quality electron beam. In this thesis I describe various aspects of development of the Fermilab electron cooling system, and the techniques used to obtain the electron beam suitable for the cooling process. In particular I emphasize those aspects of the work formore » which I was principally responsible.« less

Authors:
 [1]
+ Show Author Affiliations
  1. Univ. of Rochester, NY (United States)
Publication Date:
Research Org.:
Fermi National Accelerator Lab. (FNAL), Batavia, IL (United States)
Sponsoring Org.:
USDOE
OSTI Identifier:
878935
Report Number(s):
FERMILAB-THESIS-2005-59
TRN: US0701217
DOE Contract Number:
AC02-76CH03000
Resource Type:
Thesis/Dissertation
Country of Publication:
United States
Language:
English
Subject:
43 PARTICLE ACCELERATORS; ALGORITHMS; ANTIPROTONS; CHARGED PARTICLES; ELECTRON BEAMS; ELECTRON COOLING; ELECTRONS; FERMILAB; FERMILAB TEVATRON; HEAT EXCHANGERS; LUMINOSITY; MAGNETIC FIELDS; MEV RANGE; PERFORMANCE; UNINTERRUPTIBLE POWER SUPPLIES; Accelerators

Citation Formats

Seletskiy, Sergei M. Attainment of Electron Beam Suitable for Medium Energy Electron Cooling. United States: N. p., 2005. Web. doi:10.2172/878935.
Copy to clipboard
Seletskiy, Sergei M. Attainment of Electron Beam Suitable for Medium Energy Electron Cooling. United States. doi:10.2172/878935.
Copy to clipboard
Seletskiy, Sergei M. Sat . "Attainment of Electron Beam Suitable for Medium Energy Electron Cooling". United States. doi:10.2172/878935. https://www.osti.gov/servlets/purl/878935.
Copy to clipboard
@article{osti_878935,
title = {Attainment of Electron Beam Suitable for Medium Energy Electron Cooling},
author = {Seletskiy, Sergei M.},
abstractNote = {Electron cooling of charged particle beams is a well-established technique at electron energies of up to 300 keV. However, up to the present time the advance of electron cooling to the MeV-range energies has remained a purely theoretical possibility. The electron cooling project at Fermilab has recently demonstrated the ¯rst cooling of 8.9 GeV/c antiprotons in the Recycler ring, and therefore, has proved the validity of the idea of relativistic electron cool- ing. The Recycler Electron Cooler (REC) is the key component of the Teva- tron Run II luminosity upgrade project. Its performance depends critically on the quality of electron beam. A stable electron beam of 4.3 MeV car- rying 0.5 A of DC current is required. The beam suitable for the Recycler Electron Cooler must have an angular spread not exceeding 200 ¹rad. The full-scale prototype of the REC was designed, built and tested at Fermilab in the Wideband laboratory to study the feasibility of attaining the high-quality electron beam. In this thesis I describe various aspects of development of the Fermilab electron cooling system, and the techniques used to obtain the electron beam suitable for the cooling process. In particular I emphasize those aspects of the work for which I was principally responsible.},
doi = {10.2172/878935},
journal = {},
number = ,
volume = ,
place = {United States},
year = {Sat Jan 01 00:00:00 EST 2005},
month = {Sat Jan 01 00:00:00 EST 2005}
}
Copy to clipboard
Thesis/Dissertation:
View Thesis/Dissertation (3.42 MB)
DOI:  10.2172/878935
Other availability
Please see Document Availability for additional information on obtaining the full-text document. Library patrons may search WorldCat to identify libraries that hold this thesis or dissertation.
Save / Share:
Export Metadata
Save to My Library
You must Sign In or Create an Account in order to save documents to your library.

  • Electron cooling at low energies (..gamma.. slightly greater than one) has been shown to be an extremely effective means to increase the phase space density of proton beams. This document starts with a review of the progress made in low energy electron cooling, followed by a brief look at the parameters of intermediate energy electron cooling. (..gamma.. of five to ten). The results of an emittance measurement done on an electrostatic accelerator are presented indicating that such a device would be ideal for intermediate energy electron cooling. Application of intermediate energy electron cooling to the Fermilab antiproton source is theoreticallymore » studied. Lastly, the final equilibrium antiproton emittances obtainable are estimated.« less

  • Electron-cooling at low energies (more » $$\gamma$$ slightly greater than one) has been shown to be an extremely effective means to increase the phase space density of proton beams. This document starts with a review of the progress made in low energy electron cooling, followed by a brief look at the parameters of intermediate energy electron cooling. ($$\gamma$$ of five to ten). The results of an emittance measurement done on an electrostatic accelerator are presented indicating that such a device would be ideal for intermediate energy electron cooling. A complete electron optics design of the system is done next, solving the beam envelope evolution problem in the presence of emittance, space charge, and acceleration. Application of intermediate energy electron cooling to the Fermilab antiproton source is theoretically studied. The amount of time it takes for the antiproton beam to cool is calculated including the effects of finite electron beam temperature, betatron oscillations, and intrabeam scattering. A four ampere electron beam will cool the Fermilab antiproton beam in half an hour. Lastly, the final equilibrium antiproton emittances obtainable are estimated. Equilibrium between the competing processes of intrabeam scattering and electron cooling exists when the transverse antiproton beam emittances are 0.12 $$\pi$$ mm-mr and the longitudinal antiproton beam emittance is $$\Delta$$ p/p = l x $$10^{-5}$$ This represents a phase space density increase of about 15 in each transverse plane, and an improvement of 20 in the energy resolution of the accumulator. Possible instabilities of such a dense beam are investigated.« less

  • 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 experimentsmore » 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.« less