High-intensity multi-bunch beam generation by a photo-cathode RF gun

Koichiro Hirano, Masafumi Fukuda, Mikio Takano, Yoshio Yamazaki, Toshiya Muto, Sakae Araki, Nobuhiro Terunuma, Masao Kuriki, Mitsuo Akemoto, Hitoshi Hayano, Junji Urakawa

Research output: Contribution to journalArticlepeer-review

25 Citations (Scopus)


A multi-bunch photo-cathode RF gun system has been developed as an electron source for the production of intense quasi-monochromatic X-rays based on inverse Compton scattering. The desired multi-bunch beam is 100 bunches/pulse with a total charge of 500 nC and a bunch spacing of 2.8 ns. We modified the gun cavity of a 'BNL-type IV' RF gun to allow a CsTe cathode plug in the end plate. The system uses a four-dipole chicane beam line to allow the injection of laser light normal to the cathode surface. We compensate the gun cavity beam loading caused by the high-intensity multi-bunch electron beam by injecting the laser pulse before RF power has filled the cavity. We have achieved a total intensity of 220 nC in 100 bunches with a bunch-to-bunch energy spread under 1.3% (peak-to-peak). This paper concentrates on experiments to generate the high-intensity multi-bunch beam with compensation of the bunch-to-bunch energy spread due to heavy beam loading.

Original languageEnglish
Pages (from-to)233-239
Number of pages7
JournalNuclear Instruments and Methods in Physics Research, Section A: Accelerators, Spectrometers, Detectors and Associated Equipment
Issue number2
Publication statusPublished - 2006 May 10


  • Beam loading
  • Multi-bunch
  • Photo-cathode
  • RF gun


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