Experiment research of CAEP FIR-FEL

First lasing of the CAEP FIR-FEL at the center wavelength of 115 microns was observed in March 2005. The facility is based on RF linac, which consists of an RF-gun, an alpha magnet, an L-band SW accelerator, a beam transport line, a wiggler, an optical cavity and a measurement system. In this paper, the main parts of the facility and the main experimental results are introduced.