Design and study of FIR FEL device using S-band linac at FEL-SUT

Tokyo University of Science and Kawasaki Heavy Industries, Ltd. (KHI) have completed in 2001 the design and assembly of an FIR-FEL device using an S-band linac based at a spectral range between 300 and 1000 μm. The FEL device was installed into the IR FEL Center at Tokyo University of Science in April 2002. Our optical resonator is composed of a waveguide with a gap of 4.5 mm and two cylindrical mirrors positioned in the waveguide in order to mitigate problems of slippage and diffraction losses