DEVELOPMENT OF A COMPACT C-BAND PHOTOCATHODE RF GUN*

A C-band photocathode RF gun for a compact electron diffraction facility is developed at Tsinghua University, which is designed to work at the frequency of 5.712GHz. This paper presents the physics and structure design of this C-band RF gun, and the comparison of beam dynamics of S-band and C-band photoinjectors. New design features will be adopted in this gun, including the optimized cavity length and elliptical iris, which are helpful to achieve better compression, lower emittance and larger mode separation.