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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60 ps的束团响应为120 ps。
On the beam line of Beijing synchrotron radiation device, a set of purity measurement system based on time-correlated single-photon counting principle was established. The system monitors the purity of the bunches in the electronic storage ring and can be used to control the injection mode to meet the needs of time-resolved experiments. It can be in a few dozen seconds to minutes along the whole ring electron beam distribution, accuracy than the bunch flow measurement system three orders of magnitude higher. The measurement results show that the purity of the bunches slowly deteriorates after injection and will reach equilibrium in a few hours, maintaining around 10-4. The time resolution of the system is influenced by the detector, the timing signal, and other factors, and the response to a beam of about 60 ps in real length is 120 ps.