Author/Authors :
Hayakawa، نويسنده , , Y. and Sato، نويسنده , , I. and Hayakawa، نويسنده , , K. and Tanaka، نويسنده , , T. and Nakazawa، نويسنده , , H. and Yokoyama، نويسنده , , K. and Kanno، نويسنده , , K. and SAKAI، نويسنده , , T. and Ishiwata، نويسنده , , K. and Enomoto، نويسنده , , A. and Fukuda، نويسنده , , S. and OHSAWA، نويسنده , , S. and Tsuchiya، نويسنده , , K. and Kato، نويسنده , , M.، نويسنده ,
Abstract :
The FEL system covering wavelengths from 800 nm to 5 μm has been developed at Laboratory for Electron Beam Research and Application (LEBRA) in Nihon University. The system consists of a conventional 125 MeV S-band linac and a planar undulator with the alternative field of 50 periods.
rst lasing of the system was achieved at the wavelength of 1.5 μm using dielectric mirrors. Although the saturation of the FEL power has not been observed yet, amplification of the spontaneous radiation power by about 108 times has been obtained with the measurement using the InSb detector. The absolute power has been estimated to be a few mJ/macropulse.
ense visible light has been observed frequently depending on the intensity of the fundamental FEL. The measured time structure of the phenomenon suggests that this is the radiation related with the formation of the microbunches in the electron beam.
