Preliminary results of a femto-second electron bunch facility

A femto-second electron bunch facility has been constructed and commissioned at the Shanghai Institute of Applied Physics(SINAP). The linac of this facility consists of an S-band thermionic cathode RF-gun, an alpha magnet and a SLAC-type accelerating tube to generate a beam, then compress the micro-bunches, and finally accelerate the beam to 20~30 MeV. Preliminary experimental result shows that the length of the micro-bunches is about 250 fs. The measured beam parameters of this facility are presented in this paper.