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Chinese Physics C> 2003, Vol. 27> Issue(12) : 1119-1122 

Longitudinal Focusing Design of Space-Charge Dominated Beams

  •  Engineering Physics Dept.,Tsinghua University,Beijing 100084,China2 Institute for Plasma Research,University of Maryland at College Park,MD 20742,USA3 FM Technologies,Inc.,USA

  • Longitudinal focusing is of great importance in space-charge-dominated bunched beams such as heavy ion fusion. The bunches lengthen rapidly due to the strong space-charge forces during transportation. The electron ring at University of Maryland (UMD) is designed to operate with bunches having rectangular and parabolic profiles. Three induction cavities along the ring will be employed for longitudinal focusing. In this paper, we first briefly review the longitudinal dynamics of parabolic and rectangular bunches. The design of the induction cavities with their high repetition rate modulators is then presented. The preliminary test results of lower voltage and repetition rate version of two different modulators and the PSPICE simulation results show that modulators work well.
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    [1] . WANG J G ,Bernal S ,Chin P et al.Design and Development of an Electron Recirculator.In:COMYN M et al.Proc.of the 1997 Particle Accelerator Confrence,Vol.2.Vancouver:APS ,1997.1855—18572. Faltens A ,Lee E P ,Rosenblum S S .J.Appl.Phys,1987,61(12):5219—52213. HO D D ,Brandon S T ,Lee E P .Part.Accel.,1991,35(15)4. WANG D X ,WANG J D ,Reiser M .Phys.Rev.,1994,73(1):66—695. WANG D X ,WANG J G ,Reiser M J.Appl.Phys.Lett.,1993,62(25):3232—32346. Reiser M .Theory and Design of Charged Particle Beams.New York:Wiley,1994.432—4367. Briggs R J.Linear Induction Accelerator.In:Proc.of LINAC’86,APS ,1986.10—138. WANG J G ,Reiser M .Nucl.Instru.Meth.in Phys.Res.,1991,301:19—269. CHEN Y B ,Reiser M J .Appl.Phys.,1989,65(9):3324—3328

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DENG Jian-Jun, WANG Jian-Guang, Reiser Martin and Godlove Terry. Longitudinal Focusing Design of Space-Charge Dominated Beams[J]. Chinese Physics C, 2003, 27(12): 1119-1122.
DENG Jian-Jun, WANG Jian-Guang, Reiser Martin and Godlove Terry. Longitudinal Focusing Design of Space-Charge Dominated Beams[J]. Chinese Physics C, 2003, 27(12): 1119-1122. shu
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Received: 2003-04-07
Revised: 1900-01-01
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Longitudinal Focusing Design of Space-Charge Dominated Beams

    Corresponding author: DENG Jian-Jun,
  • Engineering Physics Dept.,Tsinghua University,Beijing 100084,China2 Institute for Plasma Research,University of Maryland at College Park,MD 20742,USA3 FM Technologies,Inc.,USA
  • Received Date: 2003-04-07
  • Accepted Date: 1900-01-01
  • Available Online: 2003-12-05

Abstract: Longitudinal focusing is of great importance in space-charge-dominated bunched beams such as heavy ion fusion. The bunches lengthen rapidly due to the strong space-charge forces during transportation. The electron ring at University of Maryland (UMD) is designed to operate with bunches having rectangular and parabolic profiles. Three induction cavities along the ring will be employed for longitudinal focusing. In this paper, we first briefly review the longitudinal dynamics of parabolic and rectangular bunches. The design of the induction cavities with their high repetition rate modulators is then presented. The preliminary test results of lower voltage and repetition rate version of two different modulators and the PSPICE simulation results show that modulators work well.

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