A new method to generate relativistic comb bunches with tunable subpicosecond spacing

We propose and analyze a scheme to produce comb bunches, i.e. a bunch consisting of micro-bunch trains, with tunable subpicosecond spacing. In the scheme, the electron beam is first deflected by a deflecting cavity which introduces a longitudinal-dependent linear transverse kick to the particles. Af...

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Published inChinese physics C Vol. 36; no. 2; pp. 151 - 155
Main Author 杜应超 黄文会 唐传祥
Format Journal Article
LanguageEnglish
Published 01.02.2012
Subjects
Accelerators
Beams (radiation)
Deflection
Electron beams
Holes
Infrared
Masks
Trains
亚皮秒
可调
相对论
等离子体尾场
纵向分布
线性耦合
自由电子激光
间距
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ISSN1674-1137
0254-3052
DOI10.1088/1674-1137/36/2/009

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Summary:We propose and analyze a scheme to produce comb bunches, i.e. a bunch consisting of micro-bunch trains, with tunable subpicosecond spacing. In the scheme, the electron beam is first deflected by a deflecting cavity which introduces a longitudinal-dependent linear transverse kick to the particles. After passing through a drift space, the transverse beam size is linearly coupled to the longitudinal position of the particle inside the beam, and a mask is placed there to tailor the beam, then the mask distribution is imprinted on the beam＇s longitudinal distribution. A quadrupole magnet and another deflecting cavity are used in the beam line to compensate the transverse angle due to the first deflecting cavity. Analysis shows that the number, length, and spacing of the trains can be controlled through the parameters of the deflecting cavity and the mask. Such electron bunch trains can be applied to an infrared free electron laser, a plasma-wakefield accelerator and a supper-radiance THz source.
Bibliography:11-5641/O4
DU Ying-Chao HUANG Wen-Hui TANG Chuan-Xiang 1 Accelerator Laboratory, Department of Engineering Physics, Tsinghua University, Beijing 100084, China 2 Key Laboratory of Particle and Radiation Imaging （Tsinghua University）, Ministry of Education, Beijing 100084, China 3 Key Laboratory of High Energy Radiation Imaging Fundamental Science for National Defense, Beijing 100084, China
bunch trains, mask, deflecting cavity
We propose and analyze a scheme to produce comb bunches, i.e. a bunch consisting of micro-bunch trains, with tunable subpicosecond spacing. In the scheme, the electron beam is first deflected by a deflecting cavity which introduces a longitudinal-dependent linear transverse kick to the particles. After passing through a drift space, the transverse beam size is linearly coupled to the longitudinal position of the particle inside the beam, and a mask is placed there to tailor the beam, then the mask distribution is imprinted on the beam＇s longitudinal distribution. A quadrupole magnet and another deflecting cavity are used in the beam line to compensate the transverse angle due to the first deflecting cavity. Analysis shows that the number, length, and spacing of the trains can be controlled through the parameters of the deflecting cavity and the mask. Such electron bunch trains can be applied to an infrared free electron laser, a plasma-wakefield accelerator and a supper-radiance THz source.
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ISSN:1674-1137
0254-3052
DOI:10.1088/1674-1137/36/2/009