ILC光谱仪的腔体BPM系统测试
Cavity BPM System Tests for the ILC Spectrometer
摘要：
国际直线对撞机（ILC）的主要物理方案要求在相互作用点测量射束能量，其精度为$10^{-4}$或更高。为了实现这一目标，已经提出了使用高分辨率束位置监测器（BPM）的磁谱仪。本文报道了腔BPM系统，部署测试这一建议。我们证明了亚微米分辨率和微米级的稳定性超过20小时的$1\m$长BPM三联体。我们发现微米级的稳定性超过1小时的3 BPM站分布在一个$30\m$长基线。从这项工作中获得的BPM的行为和响应的理解，允许进行全面的光谱仪测试。
英文摘要：
The main physics programme of the International Linear Collider (ILC) requires a measurement of the beam energy at the interaction point with an accuracy of $10^{-4}$ or better. To achieve this goal a magnetic spectrometer using high resolution beam position monitors (BPMs) has been proposed. This paper reports on the cavity BPM system that was deployed to test this proposal. We demonstrate sub-micron resolution and micron level stability over 20 hours for a $1\m$ long BPM triplet. We find micron-level stability over 1 hour for 3 BPM stations distributed over a $30\m$ long baseline. The understanding of the behaviour and response of the BPMs gained from this work has allowed full spectrometer tests to be carried out.
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