四种基材国产厚型气体电子倍增器的模拟与性能研究
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1.核工业二九〇研究所;2.核探测与核电子学国家重点实验室

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TL82

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国家自然科学基金(11205173)


Simulation and performance study on the four type substrates of domestic thick gaseous electron multiplier
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1.No. 290 Institute of Nuclear Industry;2.State Key Laboratory of Nuclear Detection and Nuclear Electronics

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    摘要:

    陶瓷基材厚型气体电子倍增器(THGEM)已被成功运用于中子探测. 用Geant4软件模拟研究和对比了陶瓷(Ceramic)、Kapton(聚酰亚胺)、PTFE(聚四氟乙烯)和FR4(环氧树脂)基材对热中子散射和吸收. 基于国内电路板(PCB)厂生产的陶瓷-THGEM、Kapton-THGEM、PTFE-THGEM和FR4-THGEM具有相同的几何参数,孔径为200 μm,孔间距600 μm,厚度200 μm,绝缘环宽度75 μm,灵敏面积50 mm×50 mm,用能量为5.9 keV的X射线源55Fe对他们分别都做了增益、长期稳定性和能量分辨率等方面的性能测试,结果显示出四种基材的THGEM都能正常工作. 单/双层陶瓷-THGEM在Ar + CO2 = 80:20的工作气体中的最大增益分别为1.2×104和4×104,在Ar + iC4H10 = 97∶3工作气体中双层陶瓷-THGEM能量分辨率好于24.4%,在100 h的连续测试中具有良好的增益稳定性. 用239Pu α源,测试了陶瓷-THGEM的α粒子能量沉积和增益.

    Abstract:

    Ceramic-based Thick Gaseous Electron Multipliers (THGEMs) have been successfully applied to neutron detection. The influences of ceramic, FR4, kapton, and PTFE substrates on the thermal neutron scattering and absorption were studied and compared by Geant4 software. The ceramic-THGEMs, FR4-THGEMs, kapton-THGEMs and PTFE-THGEMs are homemade in PCB factory, which have the same geometric parameters such as aperture of 200 μm, hole spacing of 600 μm, thickness of 200 μm, insulation ring width of 80 μm, and sensitive area of 50 mm × 50 mm. The gas gain, energy resolution and gain stability were measured using 5.9 keV X-rays, four different type substrates THGEM can work normally. The maximum gain of a single and double layer ceramic THGEMs reach 1.2×104 and 4×104 in Ar + CO2 =80:20, respectively. The energy resolution is better than 24.4% in Ar + iC4H10 = 97:3. Good gain stability was obtained during a more than 100 hours continuous test. By using a 239Pu source, the alpha deposited energy spectrum and gain curve of the ceramic THGEM were measured.

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引用本文格式: 颜嘉庆,谢宇广,邓善桥,郑智阳. 四种基材国产厚型气体电子倍增器的模拟与性能研究[J]. 四川大学学报: 自然科学版, 2021, 58: 055001.

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  • 收稿日期:2021-02-19
  • 最后修改日期:2021-03-26
  • 录用日期:2021-03-31
  • 在线发布日期: 2021-10-12
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