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Purpose <p>The purpose of this study is to develop a multilayer GEM neutron detector based on ceramic GEM, which has high detection efficiency, high spatial resolution and large effective area (200×200 mm²), and is suitable for neutron scattering instruments such as the Very Small Angle Scattering instrument (VSANS) and Energy Resolved Neutron Imaging instrument (ERNI) at the China Spallation Neutron Source (CSNS).</p> Methods <p>A double-sided symmetric cavity structure and cascaded boron-coated GEMs were adopted to improve the detector’s neutron detection efficiency, and a small readout strip pitch of 0.78 mm was designed to optimize its spatial resolution, with an effective area of 200×200 mm². First, GEANT4 simulation was conducted to predict the detector’s performance, including detection efficiency and spatial resolution. Then the detector was fabricated, and several neutron beam experiments were carried out at the 20th beamline (BL20) of CSNS: the Time-of-Flight (TOF) method was used to measure the neutron wavelength spectrum, and a slit test was performed to characterize its spatial resolution, among others.</p> Results and Conclusion <p>A multilayer GEM neutron detector with a detection efficiency of approximately 18.3%@3 Å, a spatial resolution of about 2 mm and a sensitive area of 200×200 mm² was successfully constructed. The detector’s neutron wavelength spectrum measured via the TOF (Time of Flight) method was highly consistent with that of a high-pressure He tube, and its performance matched the GEANT4 simulation results well. It can meet the application requirements of relevant neutron scattering instruments at CSNS.</p>

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A ceramic GEM-based neutron detector with high spatial resolution and large area

  • 期刊论文

  • 发表日期：

    2025年10月17日

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  • Fei Jia,
  • Hongbang Liu,
  • Jianrong Zhou,
  • Lin Zhu,
  • Xiaojuan Zhou,
  • Lixin Zeng,
  • Liang Xiao,
  • Chaoyue Zhang,
  • Yezhao Yang,
  • Dingfu Li,
  • Hong Xu,
  • Yuguang Xie,
  • Songlin Wang,
  • Yadong Wei,
  • Zhijia Sun,
  • Yuanbo Chen

摘要

Purpose

The purpose of this study is to develop a multilayer GEM neutron detector based on ceramic GEM, which has high detection efficiency, high spatial resolution and large effective area (200×200 mm²), and is suitable for neutron scattering instruments such as the Very Small Angle Scattering instrument (VSANS) and Energy Resolved Neutron Imaging instrument (ERNI) at the China Spallation Neutron Source (CSNS).

Methods

A double-sided symmetric cavity structure and cascaded boron-coated GEMs were adopted to improve the detector’s neutron detection efficiency, and a small readout strip pitch of 0.78 mm was designed to optimize its spatial resolution, with an effective area of 200×200 mm². First, GEANT4 simulation was conducted to predict the detector’s performance, including detection efficiency and spatial resolution. Then the detector was fabricated, and several neutron beam experiments were carried out at the 20th beamline (BL20) of CSNS: the Time-of-Flight (TOF) method was used to measure the neutron wavelength spectrum, and a slit test was performed to characterize its spatial resolution, among others.

Results and Conclusion

A multilayer GEM neutron detector with a detection efficiency of approximately 18.3%@3 Å, a spatial resolution of about 2 mm and a sensitive area of 200×200 mm² was successfully constructed. The detector’s neutron wavelength spectrum measured via the TOF (Time of Flight) method was highly consistent with that of a high-pressure He tube, and its performance matched the GEANT4 simulation results well. It can meet the application requirements of relevant neutron scattering instruments at CSNS.