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《中国物理C》（英文）编辑部
2024年10月30日
Chinese Physics C> 2005, Vol. 29> Issue(5) : 517-523 

Analysis and Calculation on Electron Bunch Length Measurementby Using CDR

  •  Shanghai Institute of Applied Physics,Shanghai 201800,China

  • Measurement of electron bunch length through its generated coherent diffraction radiation (CDR) via optical autocorrelation is a new non-intercepting frequency domain diagnostics technique developed in accelerator fields recently. In this paper, the CDR emitted by femto-second electron bunches provided by the SINAP linac are analyzed and numerically calculated, experimental designs on CDR generation and bunch length measurement are presented, and the beam splitter affected interferogram is simulated. As a result, broad band continuous and high intensity CDR covering a range from far-infrared to mm-wave region can be obtained by directly using these bunches. CDR energy is mainly concentrated near the beam axis and can be up to several millijoules for Gaussian bunches. We use a far-infrared Michelson interferometer and a Golay detector to measure the autocorrelation interferogram of CDR, considering the interference effects caused by the beam splitter, the electron bunch length can be easily obtained, from which one can derive its electron density distribution.
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    [1] .LCLS Technical Design Report,SLAC-R2593 LC2414.April,20022.LI Zhi-Hui et al.HEP NP,2003,27(9):831)835 (in Chinese)(李智慧等,高能物理与核物理,2003,27(9):831)835)3.Uesaka U,Ueda T et al.Nucl.Instrum.Methods,1998,A 406:371)3794.Barry W.Proc.of the Workshop on Advanced Beam Instrument ation,KEK,Tsukuba,Japan,April,19915.Kung P,Lihn H,Bocck D et al.Phys.,Rev.,Lett.,1994,73:967)9706.ZHU Jun-Biao et al.HEP NP,2000,24 (2):172)180 (in Chinese)(朱俊彪等.高能物理与核物理,2000,24(2):172)180)7.Shibata Y,Hasebe S,Ishi K et al.Phys.Rev.,1995,E52:6787)67948.Lumpkin A H,Sereno N S,Rule DW.Nucl.Instrum.Methods,2001,A475:470)4759.Settakorn C.Proceedings of the Second Asian Particle Accelerator Conference.Beijing,China,2001.514)51610.Cast ellaoM,VerzilovY,Catani L et al.DIPAC 2001 Proceedings)ES-RF,Grenoble11.Ter Mikaelian M L.High Energy Electromagnet ic Processes in Condensed Media.In:Wiley Intersciencr.New York:Academic Press,1972.377)38912.Feng B,Oyamada M,Hinode F et al.Nucl.Instrum.and Methods,2001,A475:492)49713.Kinura WD,Fiorito R B,Rule D W.Proceeding of the 1999 Part icleAccelerat ion Conference.New York,1999.487)48914.Nodvick J S,Saxon D S.Phys.Rev.,1954,96:180)18415.Lihn H C,Kung P,Set takorn C et al.Phys.Rev.,1996,A53:6413)641816.Settakon C.Generation and Use of Coherent Transit ion Radiat ion fromShort Electron Bunches.PhD Thesis,St anford University,California,1996.113)116

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LIU Ai-Qin, LOU Zheng-Ping, CHEN You-Zhong, ZHOU Wei-Min and Dai Zhi-Min. Analysis and Calculation on Electron Bunch Length Measurementby Using CDR[J]. Chinese Physics C, 2005, 29(5): 517-523.
LIU Ai-Qin, LOU Zheng-Ping, CHEN You-Zhong, ZHOU Wei-Min and Dai Zhi-Min. Analysis and Calculation on Electron Bunch Length Measurementby Using CDR[J]. Chinese Physics C, 2005, 29(5): 517-523. shu
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Received: 2004-09-29
Revised: 2004-11-27
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Analysis and Calculation on Electron Bunch Length Measurementby Using CDR

    Corresponding author: LIU Ai-Qin,
  • Shanghai Institute of Applied Physics,Shanghai 201800,China
  • Received Date: 2004-09-29
  • Accepted Date: 2004-11-27
  • Available Online: 2005-05-05

Abstract: Measurement of electron bunch length through its generated coherent diffraction radiation (CDR) via optical autocorrelation is a new non-intercepting frequency domain diagnostics technique developed in accelerator fields recently. In this paper, the CDR emitted by femto-second electron bunches provided by the SINAP linac are analyzed and numerically calculated, experimental designs on CDR generation and bunch length measurement are presented, and the beam splitter affected interferogram is simulated. As a result, broad band continuous and high intensity CDR covering a range from far-infrared to mm-wave region can be obtained by directly using these bunches. CDR energy is mainly concentrated near the beam axis and can be up to several millijoules for Gaussian bunches. We use a far-infrared Michelson interferometer and a Golay detector to measure the autocorrelation interferogram of CDR, considering the interference effects caused by the beam splitter, the electron bunch length can be easily obtained, from which one can derive its electron density distribution.

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