The JAERI superconducting RF linac-based FELs and their cryogenics

Abstract

In the 21st century, a powerful and efficient free-electron laser (FEL) is needed for academic and industrial uses in almost all fields. In order to realize such a tunable, highly-efficient, high average power, high peak power and ultra-short pulse FEL, the JAERI FEL group and E. J. Minehara have developed an industrial FEL driven by a compact, stand-alone and zero-boil off superconducting rf linac with an energy-recovery geometry. Discussions on the JAERI FEL and cryogenics will cover market-requirements for the industrial FELs, some answers from the JAERI compact, stand-alone and zero-boil off cryostat concept and operational experiences over these 9 years, the discovery of the new, highly-efficient, high-power, and ultra-short pulse lasing mode, and the energy-recovery geometry.