论文标题
使用质心抖动和两个光束位置监视器匹配小$β$功能
Matching small $β$ functions using centroid jitter and two beam position monitors
论文作者
论文摘要
需要与小型Beta功能匹配才能保留等离子体加速器中的发射率。等离子体唤醒提供了强大的聚焦场，通常需要在MM尺度上进行beta功能，与线性对撞机的最终聚焦中发现的beta功能相当。这样的光束可以耗时，可以实验产生和诊断。我们提出了一种简单，快速且无创的方法，它仅使用两个梁位置监测器在Linac中测量三丝参数，依赖于梁相空间和抖动相位空间的相似性。通过对常规四极扫描进行基准测试，该技术的生存能力在Flashforward等离子体加速器设施中实验证明。
Matching to small beta functions is required to preserve emittance in plasma accelerators. The plasma wake provides strong focusing fields, which typically require beta functions on the mm-scale, comparable to those found in the final focusing of a linear collider. Such beams can be time consuming to experimentally produce and diagnose. We present a simple, fast, and noninvasive method to measure Twiss parameters in a linac using two beam position monitors only, relying on the similarity of the beam phase space and the jitter phase space. By benchmarking against conventional quadrupole scans, the viability of this technique was experimentally demonstrated at the FLASHForward plasma-accelerator facility.
