Tsumoru Shintake

Status of SPring-8 compact SASE source FEL project

Abstract To develop the fourth generation light source, RIKEN has started research program on an X-ray FEL source based on SASE in 2002. For the first stage of the program, in order to develop key technology specially required for the X-ray FEL, and to study technique for handling of high-peak-power radiation, RIKEN is developing the SCSS-machine: SPring-8 Compact SASE Source, which aims to generate FEL radiation at VUV region using low-emittance electron beam at 0.5–1xa0GeV energy. SCSS uses three key technologies (1) low-emittance electron injector with 500xa0kV thermionic pulsed gun, (2) high-gradient C-band (5712xa0MHz) RF system and (3) in-vacuum type short period undulator. This paper reports the current R&D status of the SCSS project.

Progress on the C-band accelerator for the SPring-8 compact SASE source

SCSS: SPring-8 Compact SASE Source (Soft X-ray FEL project) was started in 2002 in order to establish the technology required for the X-ray Free Electron Laser at 1 Angstrom region. Three key technologies: the short-period in-vacuum undulator, the high-gradient C-band accelerator and the low emittance electron source using CeB/sub 6/ single crystal thermionic-cathode enable to design the SCSS machine size within 100 m facility. The C-band RF system R&D was originally started at KEK to establish linear-accelerator technology for the e/sup +/e/sup -/ Linear Collider project, and transferred to SCSS project at SPring-8/RIKEN. In SCSS, 8 klystrons and modulators, 16 accelerating structures will be used to accelerate the beam up to 1 GeV. Construction and operation of SCSS machine will provide realistic information on reliability, maintainability and cost of the C-band RF system, which will be very useful to judge the reality of Linear Collider project based on C-band technology.