First lasing of the NIJI-IV storage-ring free-electron laser
Abstract
The first lasing at around 590 nm of a free-electron laser (FEL) in the storage ring NIJI-IV was achieved on August 18, 1992, though just above threshold. The NIJI-IV is a racetrack-type ring dedicated to FEL, which was completed in December 1990. Though the ring is compact, it has two 7.25-m straight sections. The electron beam was stacked for the first time in February 1991. After a 6.3-m optical klystron was installed in one of the straight sections, FEL related experiments were started at the end of April this year, and oscillation experiments have been carried out since the beginning of August. The electron-beam energy during the lasing was about 240 MeV, and the current was 1.1-0.2 mA/bunch. The laser wavelength ranged from 594.5 to 588.7 nm, and the bandwidth was below 0.4 nm.
- Publication:
-
Nuclear Instruments and Methods in Physics Research A
- Pub Date:
- July 1993
- DOI:
- 10.1016/0168-9002(93)90008-6
- Bibcode:
- 1993NIMPA.331...27Y