CERN Accelerating science

Article
Title	Reducing Back-Bombardment Effect Using Thermionic Cathode in IAE RF Gun
Author(s)	Kii, Toshiteru ; Hayakawa, Kazushi ; Masuda, Kai ; Murakami, Shio ; Ohgaki, Hideaki ; Yamazaki, Tetsuo ; Yoshikawa, Kiyoshi ; Zen, Heishun
Affiliation	(Kyoto University, Kyoto)
Publication	2004
In:	26th International Free Electron Laser Conference and 11th FEL User Workshop 2004, Trieste, Italy, 29 Aug - 3 Sep 2004, pp.e-proc. TUPOS21
Subject category	Accelerators and Storage Rings
Abstract	We have numerically studied on improvement of electron beam macro-pulse properties from thermionic RF gun [1,2]. Beam properties, such as energy spectrum, macro-pulse duration and emittance were measured with a 2 mm diameter slim thermionic dispenser cathode. Effect of the transverse magnetic field to reduce back-streaming electrons to these properties was studied experimentally. Comparison with measured and numerical results will be discussed. Effect of a non-flat RF input to compensate a decreasing beam energy during macropulse due to a back-bombardment effect will be also presented.