PRESENT STATUS OF PHOTO-CATHODE RF GUN SYSTEM AND ITS APPLICATIONS AT WASEDA UNIVERSITY*

High quality electron beam generation using photocathode rf gun system and its application experiments have been developed at Waseda University since 2002 fiscal year. Our system is a table-top size within 2 × 2 m 2 including the rf gun system and can generate about 4 MeV low emittance electron beam. This is applied for soft X-ray generation using laser Compton scattering and pulse radiolysis experiments based on the pump-probe technique. In case of the soft X-ray generation, the laser Compton scattering experiment between about 4.2 MeV electron beam and Nd:YLF laser light (1047 nm) is performed at 20 degrees interaction angle, so that about 300 eV soft X-ray is generated. In case of the pulse radiolysis experiment, the electron beam is used for the pump beam. The probe light is generated as white light by concentrating Nd:YLF laser light (1047 nm) on the water cell. The measurement with about 30 ps (FWHM) time resolution of this system is demonstrated for the absorption of hydrated electrons.