Proceedings PaperActivities On Free Electron Laser In Japan
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Outline is presented of activities on FEL in Japan. In the Compton regime, two projects with storage rings are going on. At ETL, studies on three major elements (accelerator, FEL device, optical cavity) at about 585nm are carried out with a TOK and a 220-MeV beam. At UVSOR of Inst. for Molecul. Sci., studies are being made at 488nm with a 500-MeV beam. Gain measurements with external lasers are being tried at both laboratories. A spontaneous emis-sion has been observed with an RF linac under a collaboration of The Univ. of Tokyo and Jpn. Atom. Energy Res. Inst. (JAERI). In the Raman regime, two programs are in progress. Studies with an induction linac, and an electromagnetic wiggler using a CO2 laser are going on at ILE of Osaka Univ. At The Inst. of Phys. and Chem. Res., a cold REB has been developed, and FEL experiments are being carried out with it. Many other FEL projects are proposed. A 25-MeV superconducting linac for FEL is under construction at JAERI. A 35-MeV double-sided microtron for FEL study is near completion at Nihon Univ. Two RF linacs of The Univ. of Tokyo and The ISIR of Osaka Univ. are being modified for FEL experiments. Con-struction of an RF linac is proposed at Tokyo Inst. of Tech. An X-band single-stage FEL is under construction at Nat. Lab. for High Energy Phys. A circular FEL is in preparation at The Inst. of Space and Astronaut. Sci. An undulator has been constructed at Mitsubishi Electric Co., and the magnetic field has been measured. A Smith-Purcell type FEL is studied at Tohoku Univ. A high-gain FEL at a by-pass section of a ring being proposed at Kyushu Univ. is in the stage of design work.