L波段射频加速器电子束微脉冲诊断
Diagnostics for electron-beam microbunch of L-band RF-linac
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摘要: 利用切伦柯夫辐射的瞬时发光机理，把相对论电子束打在熔石英靶片上转化为可见光，再用皮秒扫描相机进行测量，就可得到射频直线加速器皮秒电子束微脉冲的峰值电流及微脉冲束团。采用该方法，对L波段射频直线加速器的电子束微脉冲宽度和束团结构进行了诊断。由此构建了一套加速器电子束微脉冲的在线测量系统，该系统对调整加速器工作状态、提高束流品质使之适应自由电子激光要求起到了重要作用。Abstract: Theory of the light instantaneously emitted by Cherenkov radiation is applied to diagnosing peak current and electron-beam micro-pulse bunch structure of RF-linac. The relativistic electron-beam hitting fused silica generates visible light, which is measured by ps-streak camera. Therefore, parameters of electron-beam micro-pulse can be obtained. This method can diagnose breadth and bunch structure of electron-beam micro-pulse of L-band RF-linac,which makes it possible to form a suit of on-line measurement system of electron-beam micro-pulse of an accelerator.
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Key words:
- cherenkov radiation /
- ps-streak camera /
- rf-linac /
- ultrashort pulse /
- electron-beam
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