一种基于SiPM的新型起始时间探测器研制

程泽辉; 余玉洪; 孙志宇; 孙亚洲; 王世陶; 唐述文; 陈俊岭; 章学恒; 方芳; 闫铎; 孙宇; 张永杰; 杨海波; 刘相满; 何志轩; 李公平

doi:10.11804/NuclPhysRev.36.03.343

一种基于SiPM的新型起始时间探测器研制

Development of a New-typed Start-time Detector Based on SiPM

摘要

摘要: 本文介绍了一种新型起始时间探测器的研制。该探测器的灵敏面积为60 mm×60 mm，利用120根直径为1 mm的塑料闪烁光纤分成两层错位紧致排布，且上下相邻的3根光纤作为一个探测单元，每个探测单元均采用硅光电倍增管从双端读出信号。采用⁹⁰Sr放射源对单根光纤进行了性能测试，结果表明，闪烁光沿着光纤方向的有效传播速度约为17 cm/ns，对应的时间分辨优于600 ps。此外，利用中国科学院近代物理研究所第二条放射性束流线（RIBLL2）提供的240 MeV/u的¹⁵N次级束研究了该探测器的性能。束流测试结果表明：该探测器的时间分辨为（150±15）ps，纵向位置分辨为（1.8±0.2）cm，并且结合该探测器以及RIBLL2束流线外靶实验终端上的其他探测器，可以对实验中产生的5 ≤ Z ≤ 8的各种同位素进行非常好的粒子鉴别。

Abstract: In this paper, a new type of start-time detector is developed. The sensitive area of the detector is 60 mm×60 mm, which is divided into two layers of dislocation tightly arranged by 120 plastic scintillating fibers with a diameter of 1mm, and three adjacent fibers are used as one detecting unit that uses the silicon phtotmultiplier to read signals. The work uses ⁹⁰Sr radiation source to test the performance of a single scintillating fiber, the results show that the propagation speed of light in the fiber is about 17 cm/ns, and the corresponding time resolution is better than 600 ps. Besides the test using ⁹⁰Sr source, the detector's performance has also been inspected through the ¹⁵N secondary beam of 240 MeV/u provided by the second radioactive beam line at Lanzhou (RIBLL2) of Institute of Modern Physics, Chinese Academy of Sciences. The in-beam test results show that the time resolution and vertical position resolution of the detector are (150±15) ps and (1.8±0.2) cm respectively. Combined with the detector and other detectors on the RIBLL2 External Target Facility, various isotope particles of 5 ≤ Z ≤ 8 generated in the experiment can be well identified.

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