High Power Laser and Particle Beams, Volume. 37, Issue 1, 014005(2025)

RF design of C-band photocathode electron gun for Southern Advanced Photon Source

Shengjin Liu1,2, Shimin Jiang1,2, Xingguang Liu1,2、*, Yongchuan Xiao1,2, Xiuxia Cao1,2, Yongjia Lü1,2, and Xiao Li1,2
Author Affiliations
  • 1Institute of High Energy Physics, Chinese Academy of Sciences, Beijing 100049, China
  • 2Spallation Neutron Source Science Center, Dongguan 523803, China
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    Figures & Tables(13)
    Test platform of C-band electron gun and emittance evolution
    Profile of 3.6-cell cavity
    RF performance at beam tube and a/b rate
    3.6-cell cavity electric field and on-axis field profile
    Feed-in power vs electric field on cathode surface
    Coupler and multi-pole modes
    S11 parameter at 5.712 GHz
    Pickup angle and beam size
    Distribution of temperature and displacement in cavity
    • Table 1. RF parameters of electron gun

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      Table 1. RF parameters of electron gun

      a/ba/mmb/mmmode separation/MHzEsurf/Ecatheffective shunt impedance/(MΩ/m)Q valuepower/MW
      0.505.010.024.810.947048.68511575.117.58
      0.555.510.021.8370.934646.77511252.318.15
      0.606.010.021.9370.935344.46710901.518.83
      0.706.08.5717.8290.961443.68710691.019.00
    • Table 2. Cavity dimension and sensitivity

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      Table 2. Cavity dimension and sensitivity

      size/mmsensitivity/(MHz·mm−1)
      cavity diameter45.053140.800
      beam tube diameter18.00050.400
      single cell length26.24242.400
      semi short axis5.50014.100
      semi long axis10.00022.100
    • Table 3. X and Y direction beam emittance at different angle

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      Table 3. X and Y direction beam emittance at different angle

      angle of pickup/(°)emittance of X direction/(mm·mrad)emittance of Y direction/(mm·mrad)
      no pickup0.1980.187
      00.2100.228
      300.2230.203
      600.2070.199
      900.2190.195
    • Table 4. Water temperature and RF parameters

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      Table 4. Water temperature and RF parameters

      Twater/℃ΔTcavity/℃ΔDcavity/μmΔf/MHzflatness of E-field/%
      25.0147−1.31
      22.5126−1.12
      20.0105−0.93
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    Shengjin Liu, Shimin Jiang, Xingguang Liu, Yongchuan Xiao, Xiuxia Cao, Yongjia Lü, Xiao Li. RF design of C-band photocathode electron gun for Southern Advanced Photon Source[J]. High Power Laser and Particle Beams, 2025, 37(1): 014005

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    Paper Information

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    Received: Jun. 11, 2024

    Accepted: Nov. 29, 2024

    Published Online: Feb. 21, 2025

    The Author Email: Xingguang Liu (liuxg@ihep.ac.cn)

    DOI:10.11884/HPLPB202537.240195

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