Test Of An Rf Buncher Cavity For The Terahertz Free Electron Laser Facility

A high average power Terahertz radiation facility has been developed by the China Academy of Engineering Physics. It is the first CW THz user facility based on free electron laser in China. A 1300 MHz RF buncher is a dispensable component of this facility, which provides a longitudinal manipulation of the electron beams. This paper mainly presents the RF measurement results of the buncher cavity and some test experiments has also been done. The bunch length of electron beams can be compressed to a minimum value at the field gradient of 1.2 MV/m. Further experimental optimization is under way.