An infrared FEL facility for bio/chemical energy research is under construction at the Institute of Advanced Energy, Kyoto University. The electron beam of 25-40 MeV with macropulse duration up to 3μs will be generated by an S-band linac with a thermionic RF gun. Numerical studies to estimate the electron beam parameters and expected FEL gain of the present system have been performed to settle the goal for the system commissioning and the first operational condition. The results show that the present system can provide lasing in the wavelength from 4 to 13 μm by using a 180° arc. However, the macropulse duration is too short to deliver stable FEL for a practical usage. © 2003 Elsevier Science B.V. All rights reserved.
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