FEL facilities and application researches at the FELI

Four FEL facilities (FEL-1, FEL-2, FEL-3 and FEL-4) achieved lasing at FELI in October 1994, in February 1995, in December 1995 and in October 1996, respectively. They are open for users and can supply several MW-level FELs covering the wavelength range of 0.3–40 μm. Total operation time in 1996 was about 2400 h. The visible- and UV-facility FEL-3 has broken the world record for the shortest wavelength oscillation of linac-based FELs with a thermionic gun up to 0.278 μm. L beams are delivered from the optical cavities to the diagnostic room and four users rooms (18 stations) through the pipe lines. The beam can be shared by using fan-shaped Au-coated mirrors to several stations including two manipulators simultaneously for isotope separation, bio-medical and semiconductor applications.