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A stopping layer concept to improve the spatial resolution of gas-electron-multiplier neutron detector |
| Jianjin Zhou(周建晋)1,2,3,5, Jianrong Zhou(周健荣)2,3,4,†, Xiaojuan Zhou(周晓娟)2,3, Lin Zhu(朱林)2,3,4, Jianqing Yang(杨建清)2,3, Guian Yang(杨桂安)2,3, Yi Zhang(张毅)1, Baowei Ding(丁宝卫)1,‡, Bitao Hu(胡碧涛)1, Zhijia Sun(孙志嘉)2,3,4,§, Limin Duan(段利敏)5, and Yuanbo Chen(陈元柏)2,3,4 |
1 School of Nuclear Science and Technology, Lanzhou University, Lanzhou 730000, China;
2 Spallation Neutron Source Science Center, Dongguan 523803, China;
3 State Key Laboratory of Particle Detection and Electronics, Institute of High Energy Physics, Chinese Academy of Sciences, Beijing 100049, China;
4 University of Chinese Academy of Sciences, Beijing 100049, China;
5 Institute of Modern Physics, Chinese Academy of Sciences, Lanzhou 730000, China |
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Abstract In recent years, gas electron multiplier (GEM) neutron detectors have been developing towards high spatial resolution and high dynamic counting range. We propose a novel concept of an Al stopping layer to enable the detector to achieve sub-millimeter (sub-mm) spatial resolution. The neutron conversion layer is coated with the Al stopping layer to limit the emission angle of ions into the drift region. The short track projection of ions is obtained on the signal readout board, and the detector would get good spatial resolution. The spatial resolutions of the GEM neutron detector with the Al stopping layer are simulated and optimized based on Geant4GarfieldInterface. The spatial resolution of the detector is 0.76 mm and the thermal neutron detection efficiency is about 0.01% when the Al stopping layer is 3.0 μ m thick, the drift region is 2 mm thick, the strip pitch is 600 μ m, and the digital readout is employed. Thus, the GEM neutron detector with a simple detector structure and a fast readout mode is developed to obtain a high spatial resolution and high dynamic counting range. It could be used for the direct measurement of a high-flux neutron beam, such as Bragg transmission imaging, very small-angle scattering neutron detection and neutron beam diagnostic.
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Received: 01 October 2021
Revised: 11 November 2021
Accepted manuscript online:
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PACS:
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07.07.Df
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(Sensors (chemical, optical, electrical, movement, gas, etc.); remote sensing)
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29.40.Gx
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(Tracking and position-sensitive detectors)
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28.20.Pr
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(Neutron imaging; neutron tomography)
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61.05.F-
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(Neutron diffraction and scattering)
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| Fund: This work was supported by the National Key R&D Program of China (Grant No.2017YFA0403702),the National Natural Science Foundation of China (Grant Nos.11574123,11775243,12175254,and U2032166),Youth Innovation Promotion Association CAS and Guangdong Basic and Applied Basic Research Foundation (Grant No.2019A1515110217),and the Xie Jialin Foundation,China (Grant No.E1546FU2). |
Corresponding Authors:
Jianrong Zhou,E-mail:zhoujr@ihep.ac.cn;Baowei Ding,E-mail:dingbw@lzu.edu.cn;Zhijia Sun,E-mail:sunzj@ihep.ac.cn
E-mail: zhoujr@ihep.ac.cn;dingbw@lzu.edu.cn;sunzj@ihep.ac.cn
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| About author: 2021-11-15 |
Cite this article:
Jianjin Zhou(周建晋), Jianrong Zhou(周健荣), Xiaojuan Zhou(周晓娟), Lin Zhu(朱林), Jianqing Yang(杨建清), Guian Yang(杨桂安), Yi Zhang(张毅), Baowei Ding(丁宝卫), Bitao Hu(胡碧涛), Zhijia Sun(孙志嘉), Limin Duan(段利敏), and Yuanbo Chen(陈元柏) A stopping layer concept to improve the spatial resolution of gas-electron-multiplier neutron detector 2022 Chin. Phys. B 31 050702
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