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タイトル: Reduction of transverse emittance in electron injectors caused by space charge effects
著者: Mizuno, A.
Masuda, K.
Yamamoto, M.
著者名の別形: 増田, 開
キーワード: Emittance evolution
Electron injector
Space charge effects
発行日: Feb-2015
出版者: Elsevier B.V.
誌名: Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment
巻: 774
開始ページ: 51
終了ページ: 59
抄録: We report that transverse emittance can be reduced by the space charge effects in electron injectors. The reduction of emittance in an ideal DC-accelerated continuous beam is numerically calculated and the mechanisms of the reduction are analytically discussed. Beam edge and image charge effects at a cathode produce a particular nonlinearity in r–r′ phase space, which is discussed in the paper, and they contribute to reducing the emittance immediately after the cathode. We also show examples of reduced emittance for practical electron injectors such as that in the SCSS thermionic gun with a continuous beam, and those in the SPring-8 rf photoinjector and the BNL-type rf photoinjector with pulsed beams. For pulsed beams, the focusing effects caused by an rf cavity also contribute to reducing the emittance. These reductions only appear when the beam charge is low.
著作権等: © 2014 Elsevier B.V.
This is not the published version. Please cite only the published version. この論文は出版社版でありません。引用の際には出版社版をご確認ご利用ください。
URI: http://hdl.handle.net/2433/193433
DOI(出版社版): 10.1016/j.nima.2014.11.068
出現コレクション:学術雑誌掲載論文等

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