在PSI进行的MUSE实验用带SiPM读出的定时探测器
Timing Detectors with SiPM read-out for the MUSE Experiment at PSI
摘要：
保罗·谢勒研究所的μ子散射实验使用电子、μ子和π子的混合束，需要精确的时间来识别束粒子和它们引起的反应。我们描述了三个定时探测器的设计和性能，使用塑料闪烁体读出与硅光电倍增器，已建成的实验。位于散射目标上游的束流描迹仪对束流通量进行计数，并对束粒子进行精确计时，以识别物种并为飞行时间测量提供起始时间。位于散射目标下游的射束监视器可对未散射的射束通量进行计数，帮助识别散射事件中的背景，并精确计算射束粒子的飞行时间测量时间。光束聚焦监视器安装在靶真空室内液氢靶下方的靶梯上，用于在靶中心附近的三个点（光束应聚焦的位置）进行专门的光束点采样。
英文摘要：
The Muon Scattering Experiment at the Paul Scherrer Institut uses a mixed beam of electrons, muons, and pions, necessitating precise timing to identify the beam particles and reactions they cause. We describe the design and performance of three timing detectors using plastic scintillator read out with silicon photomultipliers that have been built for the experiment. The Beam Hodoscope, upstream of the scattering target, counts the beam flux and precisely times beam particles both to identify species and provide a starting time for time-of-flight measurements. The Beam Monitor, downstream of the scattering target, counts the unscattered beam flux, helps identify background in scattering events, and precisely times beam particles for time-of-flight measurements. The Beam Focus Monitor, mounted on the target ladder under the liquid hydrogen target inside the target vacuum chamber, is used in dedicated runs to sample the beam spot at three points near the target center, where the beam should be focused.
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