Status report of Research Laboratory for Quantum Beam Science, ISIR, Osaka University

The present status of L-band, RF-gun and S-band linacs and MeV electron microscope at the Research Laboratory for Quantum Beam Science in ISIR, at Osaka University was reported. The L-band linac is used for time-resolved measurements of ionizing radiation induced reactions by pulse radiolysis technique in the time range from nano-second down to sub-picosecond, and for generation of terahertz light based on free electron laser (FEL). The last year, dark current measures of electron gun cathode were taken, and cooling and pressurized air piping, FEL equipment and solid-state switches were repaired and updated. Furthermore, a kicker magnet aiming for beam sharing of 10Hz or more was manufactured. The RF-Gun linac is mainly used for generation of ultrashort-pulsed electron bunches and for study of femto-second/atto-second pulse radiolysis. Last year, the picosecond laser used to excite the RF electron gun failed. Therefore, the RF electron gun linac and MeV electron microscope were used in the experiments with ultrashort pulsed electron beams using a femtosecond laser. The 45-degree beam port of the S-band linac were maintained, and the beam focusing experiments by discharged plasma were conducted. (author)