FEL BEAM QUALITIES AND APPLICATION RESEARCHES AT THE FELI

The FELI four FEL facilities (FEL-1, FEL-2, FEL-3 and FEL-4) are open for users to supply several MW-level FELs covering a wide wavelength r ange from 278 nm to 40 mu m. The ultraviolet (UV)- and visible-FEL fac ility (FEL-3) keeps the world record for the shortest wavelength oscil lation of linac-based FELs with a thermionic gun since 1995. Technical challenges have been tried at simultaneous FEL beam sharing with fan- shaped mirrors for multistations including two manipulators and at FEL beam diagnostics of micropulse length and beam profile. The latter is for the evaluations of FEL peak power densities at irradiated spots. FEL peak power densities and adequate wavelengths are evaluated at thi rteen research subjects performed at the FELI. The application researc hes have been performed distributed in a wide field of material scienc e, chemical technology and bio-medical applications. (C) 1998 Elsevier Science B.V. All rights reserved.