Design of RF chopper system for improving beam quality in FEL injector with thermionic gun

Design of RF chopper system for improving beam quality in FEL injector with thermionic gun
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提高热电子枪 FEL 注入器光束质量的射频斩波系统设计

DOI:
10.1016/j.nima.2014.04.048
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发表时间:
2014-08
期刊:
Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment
影响因子:
--
通讯作者:
Zhang F.
Zhang F.
中科院分区:
其他
文献类型:
--
作者:
Chen Q.;Qin B.;Tan P.;Hu T.;Pei Y.;Zhang F.

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对于基于直线加速器的自由电子激光器 (FEL),良好的光束质量很大程度上有助于最终辐射的成功。 HUST THz-FEL 设施面临的一个缺陷是电子枪中出现并贯穿整个束线的长束尾。本文建议在电子枪后部署斩波器系统,以在束尾进入直线加速器之前将其截断。详细讨论了斩波腔的物理尺寸,我们开发并导出了适用于所有频率的新解析表达式,以实现最佳设计。此外,还考虑了型腔的技术问题。通过束流动力学模拟来检验截断效应,结果表明,可以有效去除78%以上的束尾,同时将发射度和能量扩散保持在可接受的水平。
For a linac-based Free Electron Laser (FEL), good beam quality largely contributes to the success of the final radiation. An imperfection confronted with the HUST THz-FEL facility is the long beam tail that emerges in the electron gun and exists through the whole beam line. This paper proposes to deploy a chopper system after the electron gun to truncate the beam tails before they enter into the linac. Physical dimensions of the chopper cavity are discussed in detail and we have developed and derived new analytical expressions applying to all frequencies for the optimal design. Also, technical issues of the cavity are considered. Beam dynamic simulation is performed to examine the truncation effect and the results show that more than 78% of the beam tail can be removed effectively, while preserving the emittance and energy spread in acceptable level.
DOI: 10.1109/pac.1989.73023
发表时间: 1989
期刊: Proceedings of the 1989 IEEE Particle Accelerator Conference, . 'Accelerator Science and Technology
影响因子: --
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