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

fYear

2007

fDate

25-29 June 2007

Firstpage

2787

Lastpage

2789

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;

fLanguage

English

Publisher

ieee

Conference_Titel

Particle Accelerator Conference, 2007. PAC. IEEE

Conference_Location

Albuquerque, NM

Print_ISBN

978-1-4244-0916-7

Type

conf

DOI

10.1109/PAC.2007.4440576

Filename

4440576