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核技术  2015 

BEPCII纯度测量系统

DOI: 10.11889/j.0253-3219.2015.hjs.38.050103, PP. 50103-50103

Keywords: 同步辐射,单光子,储存环,束团纯度

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Abstract:

在北京同步辐射装置光束线上,建立了一套基于时间相关单光子计数原理的纯度测量系统。该套系统能监视电子储存环中的束团纯度情况,能用于控制注入模式来满足时间分辨实验的需求。它能在几十秒到几分钟内得到电子束团沿全环分布,精度比束团流强测量系统高3个量级。测量结果表明,束团的纯度在注入后缓慢变差,在几个小时后将达到平衡,维持在10?4左右。系统的时间分辨能力受探测器、定时信号等因素的影响,对真实长度约为60ps的束团响应为120ps。

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