Construction and development of a UV free electron laser under the cooperation of Nihon U, KEK, PNC, ETL and Tohoku U

The construction and development of a UV free electron laser has started under the cooperation of Nihon U, KEK, PNC, ETL and Tohoku U. The project requires a 70 MeV S band electron linear accelerator to produce a high brightness electron beam at a micropulse of 210pC and 3.5ps with a macropulse of 20μs and 200mA in average current. The injection system consists of a rf gun with a LaB6 cathode and beams are compressed by using α magnet. The rf cavity is designed to eliminate the cathode back-bombardment and allows control of the beam current. A laser output of 30 MW in peak power and 30 W in average power would be expected in the wavelength of UV region. (author)