FEL gain measurement with a Novel Method

Masaki Fujimoto, Ryukou Kato, Keigo Kawase, Akinori Irizawa, Fumiyoshi Kamitsukasa, Hiroki Ohsumi, Masaki Yaguchi, Goro Isoyama, Shigeru Kashiwagi, Shigeru Yamamoto

研究成果: Conference contribution

抄録

A novel method to measure temporal development of the FEL power has been developed using a silicon bolometer, which response linearly to input over a wide range[1]. The Si bolometer has the time resolution of ∼1 ms, which is much longer than the FEL macropulse of a few μs, so that it measures energy in the macropulse. The number of amplifications is changed by varying the pulse length of electrons from the gun of the linac and energy in the FEL macropulse is measured at a wavelength ∼100 μm with the detector and appropriate Teflon absorbers. The energy development of the FEL macropulse is measured over eight orders of magnitude from a very low power level close to the incoherent radiation up to the FEL power saturation. The temporal development of the FEL power is derived from the energy development as a function of the number of amplifications. Then the FEL gain is derived from the power development. We measured energy development in the macropulse and derived the FEL gain at some cavity lengths. The maximum FEL gain thus evaluated is about 56 percent, which agrees with calculation by the Super-Mode theory.

本文言語English
ホスト出版物のタイトルFEL 2012 - 34th International Free Electron Laser Conference
ページ515-518
ページ数4
出版ステータスPublished - 2012
イベント34th International Free Electron Laser Conference, FEL 2012 - Nara, Japan
継続期間: 2012 8 262012 8 31

出版物シリーズ

名前FEL 2012 - 34th International Free Electron Laser Conference

Other

Other34th International Free Electron Laser Conference, FEL 2012
国/地域Japan
CityNara
Period12/8/2612/8/31

ASJC Scopus subject areas

  • 核物理学および高エネルギー物理学

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