A stopping layer concept to improve the spatial resolution of gas-electron-multiplier neutron detector
A stopping layer concept to improve the spatial resolution of gas-electron-multiplier neutron detector
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DOI：
10.1088/1674-1056/ac398e
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发表时间：
2022-04-01
影响因子：
1.7
通讯作者：
Chen, Yuanbo
中科院分区：
文献类型：
--
作者：
Zhou, Jianjin;Zhou, Jianrong;Chen, Yuanbo
近年来，气体电子倍增中子探测器正朝着高空间分辨率和高动态计数范围的方向发展。我们提出了一种新的人工智能停止层的概念，使探测器能够达到亚毫米（亚毫米）的空间分辨率。在中子转换层上涂有Al停止层，以限制离子进入漂移区的发射角度。在信号读出板上获得了离子的短航迹投影，探测器获得了良好的空间分辨率。基于Geant4GarfieldInterface对带有Al阻挡层的GEM中子探测器的空间分辨率进行了仿真和优化。当Al停止层厚度为3.0 μ m，漂移区厚度为2 mm，条带间距为600 μ m，采用数字读出时，探测器的空间分辨率为0.76 mm，热中子探测效率约为0.01%。因此，研制出探测器结构简单、读出方式快速的GEM中子探测器，以获得高空间分辨率和高动态计数范围。它可用于高通量中子束的直接测量，如布拉格透射成像、极小角散射中子探测和中子束诊断。
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 mu m thick, the drift region is 2 mm thick, the strip pitch is 600 mu 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.