中国物理B ›› 2023, Vol. 32 ›› Issue (11): 110701-110701.doi: 10.1088/1674-1056/acd8a2

所属专题： Featured Column — INSTRUMENTATION AND MEASUREMENT

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Performance optimization of scintillator neutron detectors for EMD in CSNS

Xiaojie Cai(蔡小杰)1,2, Qian Yu(于潜)3, Chang Huang(黄畅)1, Bin Tang(唐彬)1,4,†, Shihui Zhou(周诗慧)1, Xiaohu Wang(王小胡)5,‡, Xiuping Yue(岳秀萍)1, and Zhijia Sun(孙志嘉)1,4,§   

  1. 1 Spallation Neutron Source Science Center, Dongguan 523803, China;
    2 Southwest University of Science and Technology, Mianyang 621002, China;
    3 Institute of Modern Physics, Chinese Academy of Sciences, Lanzhou 730000, China;
    4 Institute of High Energy Physics, Chinese Academy of Sciences, Beijing 100049, China;
    5 Shenzhen Key Laboratory of Ultraintense Laser and Advanced Material Technology, Center for Advanced Material Diagnostic Technology, and College of Engineering Physics, Shenzhen Technology University, Shenzhen 518118, China
  • 收稿日期:2022-12-23 修回日期:2023-05-15 接受日期:2023-05-25 出版日期:2023-10-16 发布日期:2023-10-26
  • 通讯作者: Bin Tang, Xiaohu Wang, Zhijia Sun E-mail:tangb@ihep.ac.cn;wangxiaohu@sztu.edu.cn;sunzj@ihep.ac.cn
  • 基金资助:
    Project supported by the National Natural Science Foundation of China (Grant Nos. 11975255 and 11875273) and Guangdong Basic and Applied Basic Research Foundation (Grant No. 2020B1515120025).

Performance optimization of scintillator neutron detectors for EMD in CSNS

Xiaojie Cai(蔡小杰)1,2, Qian Yu(于潜)3, Chang Huang(黄畅)1, Bin Tang(唐彬)1,4,†, Shihui Zhou(周诗慧)1, Xiaohu Wang(王小胡)5,‡, Xiuping Yue(岳秀萍)1, and Zhijia Sun(孙志嘉)1,4,§   

  1. 1 Spallation Neutron Source Science Center, Dongguan 523803, China;
    2 Southwest University of Science and Technology, Mianyang 621002, China;
    3 Institute of Modern Physics, Chinese Academy of Sciences, Lanzhou 730000, China;
    4 Institute of High Energy Physics, Chinese Academy of Sciences, Beijing 100049, China;
    5 Shenzhen Key Laboratory of Ultraintense Laser and Advanced Material Technology, Center for Advanced Material Diagnostic Technology, and College of Engineering Physics, Shenzhen Technology University, Shenzhen 518118, China
  • Received:2022-12-23 Revised:2023-05-15 Accepted:2023-05-25 Online:2023-10-16 Published:2023-10-26
  • Contact: Bin Tang, Xiaohu Wang, Zhijia Sun E-mail:tangb@ihep.ac.cn;wangxiaohu@sztu.edu.cn;sunzj@ihep.ac.cn
  • Supported by:
    Project supported by the National Natural Science Foundation of China (Grant Nos. 11975255 and 11875273) and Guangdong Basic and Applied Basic Research Foundation (Grant No. 2020B1515120025).

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摘要： Chinese Spallation Neutron Source (CSNS) has successfully produced its first neutron beam in 28th August 2017. It has been running steadily from March, 2018. According to the construction plan, the engineering materials diffractometer (EMD) will be installed between 2019-2023. This instrument requires the neutron detectors with the cover area near 3 m2 in two 90° neutron diffraction angle positions, the neutron detecting efficiency is better than 40%@1 Å, and the spatial resolution is better than 4 mm×200 mm in horizontal and vertical directions respectively. We have developed a one-dimensional position-sensitive neutron detector based on the oblique 6LiF/ZnS(Ag) scintillators, wavelength shifting fibers, and SiPMs (silicon photomultipliers) readout. The inhomogeneity of the neutron detection efficiency between each pixel and each detector module, which caused by the inconsistency of the wave-length shifting fibers in collecting scintillation photons, needs to be mitigated before the installation. A performance optimization experiment of the detector modules was carried out on the BL20 (beam line 20) of CSNS. Using water sample, the neutron beam with Φ 5 mm exit hole was dispersed related evenly into the forward space. According to the neutron counts of each pixel of the detector module, the readout electronics threshold of each pixel is adjusted. Compared with the unadjusted detector module, the inhomogeneity of the detection efficiency for the adjusted one has been improved from 69% to 90%. The test result of the diffraction peak of the standard sample Si showed that the adjusted detector module works well.

关键词: scintillator neutron detector, silicon photomultipliers, wavelength shifting fiber, 6LiF/ZnS scintillator, detection efficiency inhomogeneity

Abstract: Chinese Spallation Neutron Source (CSNS) has successfully produced its first neutron beam in 28th August 2017. It has been running steadily from March, 2018. According to the construction plan, the engineering materials diffractometer (EMD) will be installed between 2019-2023. This instrument requires the neutron detectors with the cover area near 3 m2 in two 90° neutron diffraction angle positions, the neutron detecting efficiency is better than 40%@1 Å, and the spatial resolution is better than 4 mm×200 mm in horizontal and vertical directions respectively. We have developed a one-dimensional position-sensitive neutron detector based on the oblique 6LiF/ZnS(Ag) scintillators, wavelength shifting fibers, and SiPMs (silicon photomultipliers) readout. The inhomogeneity of the neutron detection efficiency between each pixel and each detector module, which caused by the inconsistency of the wave-length shifting fibers in collecting scintillation photons, needs to be mitigated before the installation. A performance optimization experiment of the detector modules was carried out on the BL20 (beam line 20) of CSNS. Using water sample, the neutron beam with Φ 5 mm exit hole was dispersed related evenly into the forward space. According to the neutron counts of each pixel of the detector module, the readout electronics threshold of each pixel is adjusted. Compared with the unadjusted detector module, the inhomogeneity of the detection efficiency for the adjusted one has been improved from 69% to 90%. The test result of the diffraction peak of the standard sample Si showed that the adjusted detector module works well.

Key words: scintillator neutron detector, silicon photomultipliers, wavelength shifting fiber, 6LiF/ZnS scintillator, detection efficiency inhomogeneity

中图分类号:  (Sensors (chemical, optical, electrical, movement, gas, etc.); remote sensing)

  • 07.07.Df
29.40.Mc (Scintillation detectors) 28.20.Cz (Neutron scattering) 61.05.F- (Neutron diffraction and scattering)