Title :
Commissioning a cartridge-type photocathode RF gun system at university of Tokyo
Author :
Sakumi, A. ; Ueda, T. ; Mizuno, K. ; Uesaka, M. ; Kumagai, N. ; Hanaki, H. ; Suzuki, S. ; Tomizawa, H. ; Urakawa, J.
Author_Institution :
Univ. of Tokyo, Tokyo
Abstract :
We have developed a compact-sized cartridge-type photocathode system, which is able to replace a cathode without breaking the vacuum of RF gun to use a high quantum efficiency photocathode. The system consists of a BNL-GUN-IV RF gun, a cathode tube, a feed through and ultra-high vacuum system. The purpose of implementing the system is to increase beam charge for the applications such as pulse radiolysis experiment. We observed the charge of 9 nC from the Cs2Te cathode. The maximal quantum efficiency of 3.5% at the charge of 4 nC. It was simulated that the quantum efficiency is reduced by the space charge limit, which is caused by reducing electric field of the beam.
Keywords :
accelerator RF systems; electron accelerators; electron beams; electron guns; electron sources; particle beam bunching; RF gun; beam charge; cathode tube; electric field; electron accelerators; electron bunches; pump electron beam; quantum efficiency photocathode; radiolysis experiment; space charge limit; ultra-high vacuum system; Cathodes; Electron beams; Electron tubes; Free electron lasers; Laser beams; Laser excitation; Pump lasers; Radio frequency; Vacuum systems; X-ray lasers;
Conference_Titel :
Particle Accelerator Conference, 2007. PAC. IEEE
Conference_Location :
Albuquerque, NM
Print_ISBN :
978-1-4244-0916-7
DOI :
10.1109/PAC.2007.4440576
