Author/Authors :
Kuroda، نويسنده , , R. and Ogawa، نويسنده , , H. and Sei، نويسنده , , N. and Toyokawa، نويسنده , , H. and Yagi-Watanabe، نويسنده , , K. and Yasumoto، نويسنده , , M. and Koike، نويسنده , , M. and Yamada، نويسنده , , K. and Yanagida، نويسنده , , T. and Nakajyo، نويسنده , , T. and Sakai، نويسنده , , F.، نويسنده ,
Abstract :
A compact terahertz (THz) SASE-FEL source has been developed with a compact S-band electron linac at AIST. The S-band linac has been improved using a Cs2Te photocathode rf gun with a compact load-lock system. The 40 MeV electron beam which has a bunch charge of more than 2 nC/bunch was stably generated using our system with the Cs2Te photocathode, and the quantum efficiency (QE) typically achieved was about 0.3%. The surface observation of the Cs2Te photocathode to obtain the surface micrographs and QE mapping images was successfully performed with a photoelectron emission microscopy (PEEM).
Keywords :
THz , Cs2Te photocathode , Free-electron laser , Photoelectron emission microscopy , PEEM
