Beam Dynamics characteristic in 1/2+m Cell's Harmonic Microwave Cun

  • In order to decrease the energy spread and to get a small traverse emittance as well as high brightness of the electron beam in the injector of the FEL, a 1/2+m cell's microwave gun scheme adopted the technique of the harmonic cavity is presented. By using K. J. Kim method, the beam dynamics characteristic in the 1/2+m cell'S harmonic microwave gun is studied. The derived formulas demonstrate that with this scheme, the energy spread and traverse emittance of the electron beam are improved. In comparison with above analytical results, a beam dynamics simulation is performed with PARMELA code. The result shows that the harmonic microwave gun is favourable for improving the energy spread and repressing the phase space dilution.
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  • [1] C.E.Hess et al,IEEE Trans.Nucl.Sci,NS-32(1985)2924.[2]T.I.Smith,SLAC-303(1986)421.[3]赵振堂,混频加速腔的理论与实验研究,清华大学博士论文(1990).[4]K.T.Mcdonald,IEEE Trans Electr.Dev,35(1988)2052.[5]E.Tanabe et al,SLAC-PUB-5054(1989).[6]K.Batchelor et al,EPAC-1988(1988)954.[7]K.J.Kim,Nucl.Instr.Meth.in Phys.Res,A275(1988)207.[8]P.G.O'shea et al,Nucl.Instr.Meth.in Phys.Res,A318(1992)52.[9]M.Takabe et al,ibid 367.
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Zhao Zhentang, Lin Yuzheng and Wang Hongyuan. Beam Dynamics characteristic in 1/2+m Cell's Harmonic Microwave Cun[J]. Chinese Physics C, 1994, 18(7): 664-672.
Zhao Zhentang, Lin Yuzheng and Wang Hongyuan. Beam Dynamics characteristic in 1/2+m Cell's Harmonic Microwave Cun[J]. Chinese Physics C, 1994, 18(7): 664-672. shu
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Received: 1900-01-01
Revised: 1900-01-01
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Beam Dynamics characteristic in 1/2+m Cell's Harmonic Microwave Cun

    Corresponding author: Zhao Zhentang,
  • Department of Physics.Tsinghua University,Beijing 100084

Abstract: In order to decrease the energy spread and to get a small traverse emittance as well as high brightness of the electron beam in the injector of the FEL, a 1/2+m cell's microwave gun scheme adopted the technique of the harmonic cavity is presented. By using K. J. Kim method, the beam dynamics characteristic in the 1/2+m cell'S harmonic microwave gun is studied. The derived formulas demonstrate that with this scheme, the energy spread and traverse emittance of the electron beam are improved. In comparison with above analytical results, a beam dynamics simulation is performed with PARMELA code. The result shows that the harmonic microwave gun is favourable for improving the energy spread and repressing the phase space dilution.

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