Short bunch effect on tabletop THz FEL amplification

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• 作者：Keisuke Higashimura ; ^{keisuke.higashimura@iae.kyoto-u.ac.jp} ; Satoshi Ueda ; Kyohei Yoshida ; Ryota Kinjo ; Mahmoud A. Bakr ; Taro Sonobe ; Kai Masuda ; Toshiteru Kii ; Hideaki Ohgaki
• 关键词：Free-electron lasers ; Terahertz radiation ; Photocathode RF gun
• 刊名：Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment
• 出版年：2011
• 出版时间：1 May, 2011
• 年：2011
• 卷：637
• 期：1_supp_S
• 页码：S83-S86
• 全文大小：1K

文摘

A tabletop THz free-electron laser (FEL) amplifier, which consists of a photocathode radio-frequency gun and an undulator, has been studied at the Institute of Advanced Energy, Kyoto University. The concepts of the THz amplifier are (1) a high peak power of about 1 MW, (2) a whole length of less than 4 m, and (3) a spectral range of 150-300 ¦Ìm. For the feasibility study for the conceptual design, a start-to-end simulation was conducted by using Parmela and GENESIS 1.3. The slippage effect and the diffraction loss were taken into account in the FEL simulation. An output power of about 350 kW is expected from the present design scheme. The calculation shows that the short bunch electron beam has an advantage toward obtaining a higher FEL gain because of its small energy spread. Since the slippage effect becomes dominant, however, the FEL gain drops with the excessive short bunch beam.