JAERI QUASI-CW, AND HIGH-AVERAGE POWER FREE-ELECTRON LASER-DRIVEN BY A SUPERCONDUCTING RF LINAC

We have developed and constructed a prototype for a quasi-cw, and high -average power free electron laser driven by a superconducting rf lina c at the Japan Atomic Energy Research Institute (JAERI), Tokai. We hav e successfully demonstrated expected performances of the JAERI 250 keV electron gun and bunching system, and completed an extension to an ol d 5.5 MV electrostatic accelerator building as an FEL accelerator vaul t in the 1991 Japanese fiscal year. All solid state rf amplifiers, liq uid He refrigerators, a hybrid undulator and vacuum pumping stations a re ready for use now. The first superconducting accelerator module is now under preparation for a cold rf test, and the other three modules are now under assembly. A description and the latest results of the JA ERI superconducting rf linac FEL will be discussed, and reported in de tail.