宇航计测技术 ›› 2023, Vol. 43 ›› Issue (1): 40-44.doi: 10.12060/j.issn.1000-7202.2023.01.08

• 量值传递技术 • 上一篇    下一篇

GPD-GEM有效增益研究及其优化

蒋杰臣1，姜维春1，董泽芳1，杨生1，刘晓静1，刘小桦1，杜园园1，焦杨1,2，戴博宇1,2，徐玉朋1,2，何会林1,2   

  1. 1.中国科学院高能物理研究所，中国科学院粒子天体物理实验室，北京 100049；2.中国科学院大学，北京 100049
  • 出版日期:2023-02-25 发布日期:2023-04-12
  • 作者简介:蒋杰臣（1993-），男，工程师，博士，主要研究方向：探测器设计技术。
  • 基金资助:
    中科院空间科学战略先导专项（XDA15020500，XDA15020501，XDA15020501-02）资助。

Research on the Effective Gain and Optimization of the Holes Shape for the GPD-GEM

JIANG Jie-chen1,JIANG Wei-chun1,DONG Ze-fang1,YANG Sheng1,LIU Xiao-jing1,LIU Xiao-Hua1,DU Yuan-yuan1,JIAO Yang1,2,DAI Bo-yu1,2,XU Yu-peng1,2,HE Hui-lin1,2   

  1. 1.Institute of High Energy Physics,Chinese Academy of Sciences;Key Laboratory of Particle Astrophysics,Chinese Academy of Sciences,Beijing 100049,China;2.University of Chinese Academy of Sciences,Beijing 100049,China
  • Online:2023-02-25 Published:2023-04-12

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摘要： 偏振测量X射线聚焦望远镜阵列（PFA）属于增强型X射线时变与偏振空间天文台（eXTP）有效载荷之一，其位于焦平面的气体像素探测器（GPD）用于测量处于极端条件下天体辐射的软X射线偏振度等物理参数。GPD采用单层气体电子倍增器（GEM）作为气体放大级，有效面积为（15.5×15.5）mm2，孔型为双锥形结构，相邻孔间间距为50 μm，孔外直径为30 μm，锥角约为10°；该GEM孔采用非聚焦激光辐照技术制作成型，生产时由于激光非均匀性以及辐照区域重叠，将引起不同孔的锥角出现差异，造成孔间增益不均匀。基于GPD基线设计参数，通过构建GPD-GEM模拟框架，验证了模拟的有效增益和文献测试结果的一致性；在相同工作电压下，0°~10°范围内不同锥角对应的GPD-GEM有效增益基本呈线性关系。该结果表明GPD-GEM孔型最优为圆柱形结构，为其生产工艺提供了优化方向。

关键词: GPD-GEM, 增益, 模拟

Abstract: The Polarimetry Focusing Array(PFA)is one of the payloads in the enhance X-ray Timing and Polarimetry mission(eXTP),each telescope in the PFA contains a Gas Pixel Detector(GPD)which locates in the focal plane and will give the polarized degree of soft X-ray sources from celestial objects under extreme conditions.The GPD consists of a single Gas Electron Multiplier(GEM)foil with an effective area of （15.5×15.5）mm2 and holes of double conical shape as the amplification stage.The GEM foil with a pitch of 50 μm,a hole diameter of 30 μm,and a cone degree of 10 ° is fabricated by laser-etched technique.The non-uniform intensity of the laser and overlap in some irradiation areas causes different gain values among the holes during the GEM fabricates.In this study,we constructed a simulation framework for the GPD-GEM based on the baseline design and obtain a consistent trend of the effective gain measured in the reference,giving the linear relationship between the cone angle of holes and the gain under a condition of the same voltage.The studies illustrate the cylindrical shape of the GPD-GEM is a better option and provide an optimal design of it.

Key words: GPD-GEM, Gain, Simulation

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