HERA的高精度法布里-珀罗腔偏振计
A High Precision Fabry-Perot Cavity Polarimeter at HERA
摘要：
一个法布里-珀罗腔偏振计，安装在2003年在HERA的第二阶段的操作，进行了说明。腔偏振计的设计是为了测量HERA电子束的纵向偏振与高精度为每个电子束团间隔的时间间隔为96纳秒。在腔内，激光强度以稳定和可控的方式从其原始值0.7W常规地增强到几kW。通过这种高强度激光束与HERA电子束的相互作用，可以以每分钟每束2%的相对统计精度测量其偏振。还进行了详细的系统研究，导致系统不确定度为1%。
英文摘要：
A Fabry-Perot cavity polarimeter, installed in 2003 at HERA for the second phase of its operation, is described. The cavity polarimeter was designed to measure the longitudinal polarisation of the HERA electron beam with high precision for each electron bunch spaced with a time interval of 96ns. Within the cavity the laser intensity was routinely enhanced up to a few kW from its original value of 0.7W in a stable and controllable way. By interacting such a high intensity laser beam with the HERA electron beam it is possible to measure its polarisation with a relative statistical precision of 2% per bunch per minute. Detailed systematic studies have also been performed resulting in a systematic uncertainty of 1%.
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