Simulation study of a photo-injector for brightness improvement in Thomson scattering X-ray source via ballistic bunching
Simulation study of a photo-injector for brightness improvement in Thomson scattering X-ray source via ballistic bunching
复制标题
通过弹道聚束提高汤姆逊散射 X 射线源亮度的光注入器仿真研究
DOI：
10.1088/1674-1137/38/2/027003
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发表时间：
2014
影响因子：
3.6
通讯作者：
Huang Wen-Hui
中科院分区：
文献类型：
--
作者：
Ding Yun-Ze;Du Ying-Chao;Zhang Zhen;Huang Wen-Hui
提高峰值亮度有利于汤姆逊散射X射线源的各种应用。散射X射线脉冲的较高峰值亮度要求通过电子束线中的束压缩实现的较短散射电子束。在本文中，我们研究的可能性，压缩电子束在一个典型的S波段正常传导的光电注入器通过弹道聚束，通过添加一个短的RF直线加速器部分的RF枪后面，以提高峰值亮度的散射X射线脉冲。ASTRA数值优化结果表明，对于500 pC、10 ps半高宽的电子脉冲，峰值电流可以从50 A增加到> 300 A，而归一化的横向RMS发射度和RMS能量扩展几乎没有增加。相应地，汤姆逊散射X射线源的峰值亮度估计增加约三倍。
Increasing the peak brightness is beneficial to various applications of the Thomson scattering X-ray source. A higher peak brightness of the scattered X-ray pulse demands a shorter scattering electron beam realized by beam compression in the electron beam-line. In this article, we study the possibility of compressing the electron beam in a typical S-band normal conducting photo-injector via ballistic bunching, through just adding a short RF linac section right behind the RF gun, so as to improve the peak brightness of the scattered x-ray pulse. Numerical optimization by ASTRA demonstrates that the peak current can increase from 50 A to > 300 A for a 500 pC, 10 ps FWHM electron pulse, while normalized transverse RMS emittance and RMS energy spread increases very little. Correspondingly, the peak brightness of the Thomson scattering X-ray source is estimated to increase about three times.