基于硅光电倍增管的新型通用表面μ子仪器（GPS），用于在连续波束上进行μSR测量。

The new versatile general purpose surface-muon instrument (GPS) based on silicon photomultipliers for μSR measurements on a continuous-wave beam.

作者信息

Amato A, Luetkens H, Sedlak K, Stoykov A, Scheuermann R, Elender M, Raselli A, Graf D

机构信息

Laboratory for Muon-Spin Spectroscopy, Paul Scherrer Institute, 5232 Villigen PSI, Switzerland.

Swiss Plasma Center, Ecole Polytechnique Fédérale de Lausanne, 5232 Villigen PSI, Switzerland.

出版信息

Rev Sci Instrum. 2017 Sep;88(9):093301. doi: 10.1063/1.4986045.

DOI:10.1063/1.4986045

PMID:28964216

Abstract

We report on the design and commissioning of a new spectrometer for muon-spin relaxation/rotation studies installed at the Swiss Muon Source (SμS) of the Paul Scherrer Institute (PSI, Switzerland). This new instrument is essentially a new design and replaces the old general-purpose surface-muon (GPS) instrument that has been for long the workhorse of the μSR user facility at PSI. By making use of muon and positron detectors made of plastic scintillators read out by silicon photomultipliers, a time resolution of the complete instrument of about 160 ps (standard deviation) could be achieved. In addition, the absence of light guides, which are needed in traditionally built μSR instrument to deliver the scintillation light to photomultiplier tubes located outside magnetic fields applied, allowed us to design a compact instrument with a detector set covering an increased solid angle compared with the old GPS.

摘要

我们报告了一台安装在瑞士保罗谢勒研究所（PSI）瑞士μ子源（SμS）的用于μ子自旋弛豫/旋转研究的新型光谱仪的设计与调试情况。这台新仪器本质上是一种全新设计，取代了长期以来作为PSI的μSR用户设施主力设备的旧通用表面μ子（GPS）仪器。通过使用由硅光电倍增管读出的塑料闪烁体制成的μ子和正电子探测器，整套仪器可实现约160皮秒（标准偏差）的时间分辨率。此外，传统μSR仪器中需要将闪烁光传输到施加磁场外的光电倍增管的光导不存在了，这使我们能够设计出一种紧凑的仪器，其探测器组覆盖的立体角比旧的GPS有所增加。