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Sasabe, J.

Paper Title Page
WEPLS053 RF Design of a Cartridge-type Photocathode RF Gun in S-band Linac 2499
 
  • H. Moritani, Y. Muroya, A. Sakumi, T. Ueda, M. Uesaka
    UTNL, Ibaraki
  • H. Hanaki, N. Kumagai, S. Suzuki, H. Tomizawa
    JASRI/SPring-8, Hyogo-ken
  • J. Sasabe
    Hamamatsu Photonics K.K., Hamakita, Shizuoka
  • J. Urakawa
    KEK, Ibaraki
 
  A cartridge-type photocathode RF gun is under development in collaboration with SPring-8 and Hamamatsu Photonics. Each type of cathode (Cs2Te, Mg, diamond, Ag-Cs-O) is sealed in a cartridge-type vacuum tube. Several tubes can be installed in a vacuum chamber. The cathode in the tube is inserted into a center hole in the back plate of the RF gun by a vacuum manipulator. These cartridge-type photocathodes with high QE or sensitivity for visible lights, which are prepared in a factory, can be used for a long time without vacuum breaking. Since a load-lock system for forming a new high QE film is not needed, the cartridge-type RF gun becomes compact. We are going to introduce this cartridge-type system to our linac with the BNL-GUN-IV RF gun this summer. Now, we are calculating the gun parameters of the transmission cavity which has a back plate with a center hole 8mm in diameter with SUPERFISH and simulating the beam dynamics after modifying the beam line to install the system with PARMELA. We aim to use reliable Mg and high-QE Cs2Te and try diamond and Ag-Cs-O for radiation chemistry applications. The detailed numerical design and construction will be presented.