Author: Hirshfield, J.L.
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TUPTS054 1st+2nd Harmonic Photocathode Bimodal Gun R&D 2054
SUSPFO086   use link to see paper's listing under its alternate paper code  
  • L. Wang
    SINAP, Shanghai, People’s Republic of China
  • W. Fang, Z.T. Zhao
    SSRF, Shanghai, People’s Republic of China
  • J.L. Hirshfield
    Yale University, Physics Department, New Haven, CT, USA
  • J.L. Hirshfield, S.V. Shchelkunov
    Omega-P, Inc., New Haven, Connecticut, USA
  • Y. Jiang, S.V. Shchelkunov
    Yale University, Beam Physics Laboratory, New Haven, Connecticut, USA
  • L. Wang
    University of Chinese Academy of Sciences, Beijing, People’s Republic of China
  Funding: U.S. Dept. of Energy
A novel Bimodal Electron Gun is designed to apply microwaves at two harmonically-related frequency in a 0.6 cell RF gun to increase the RF breakdown threshold and enhance the beam quality. This stratagem is intended to allow the RF gun structure to support a high accelera-tion gradient as well as to manipulate the emittance evolution in the half cell. By selecting a proper ampli-tude ratio and phase relationship between the first and second harmonic RF field components in the gun cavity, the superposition of the harmonic field components can provide a flat-top like RF profile to omitting the RF emittance component in the gun, while increase the RF breakdown threshold. The recent status of the Bimodal Electron Gun R&D is presented, including the designs of the novel two frequency RF structure and the simulation of the beam dynamic.
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About • paper received ※ 14 May 2019       paper accepted ※ 23 May 2019       issue date ※ 21 June 2019  
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