Abstract

In order to realize a tunable, highly-efficient, high average power, high peak power and ultra-short pulse free-electron laser (FEL), the JAERI FEL group has developed an industrial FEL driven by a compact, stand-alone and zero-boil-off superconducting rf linac with an energy-recovery geometry (ERL). Our discussions will cover user-requirements for the industrial FEL, the JAERI compact, stand-alone and zero-boil-off cryostat, non-stop cooling, and operational experience over these 10 years, our discovery of the new, highly-efficient, high-power, and ultra-short pulse lasing mode, and the ERL-FEL commissioning and preliminary lasing. PACS codes: 41.60.C, 85.25.Q, 42.62.C

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