2013年12月1日
Study on electron beam stabilization in ku-fel
FEL 2013: Proceedings of the 35th International Free-Electron Laser Conference
- 開始ページ
- 602
- 終了ページ
- 605
A stable electron beam is essential for a stable FEL operation. In Kyoto University MIR-FEL facility (KU-FEL), a Beam Position Monitor (BPM) system consisting of six 4-button electrode type BPMs and signal processing unit was installed for monitoring of the electron beam position. Fluctuations of the electron beam position have been observed both in horizontal and vertical directions. In horizontal direction, the main fluctuation source could be the energy fluctuation of the electron beam generated by the thermionic RF gun. One of candidate of the energy fluctuation, the cavity temperature of the RF gun has been suspected, because the gun is operated in detuned condition which enhances beam energy dependence on the cavity temperature. Another candidate is the fluctuation of the RF power fed to the RF gun. The both effects were experimentally investigated. We observed a small fluctuation of the beam energy corresponding to the cavity temperature fluctuation. But the large fluctuation of the RF power which was induced by change of temperature of ferrite slabs in the 4-port circulator was clearly observed. A temperature-stabilized water circulation system will be prepared for the ferrite slabs to stabilize the RF power fed to the RF gun. Copyright © 2013 CC-BY-3.0 and by the respective authors.
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- SCOPUS ID : 84892644801