Present status of Kyoto University MIR-FEL facility

A Mid-infrared Free Electron Laser (MIR-FEL) facility for energy sciences has been developed in Institute of Advanced Energy, Kyoto University. The FEL consists of a 4.5-cell thermionic RF gun, an S-band accelerator tube, an undulator and an optical cavity. The tunable range of the FEL is extended from 10-13 μm to 5-14.5 μm after replacing its undulator and cavity mirrors. In the last fiscal year, the total operation time of FEL driver linac was 315 hours and 17% of the operation time was assigned to user experiments. In this paper, undergoing R&D work for the MIR-FEL is also reported.