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Purpose <p>The global shortage of He gas has created an urgent need for alternative thermal neutron detector technologies foradvanced neutron scattering instruments at large facilities like the China Spallation Neutron Source (CSNS). This paper aims todevelop a position-sensitive scintillator neutron detector with high detection efficiency and fine spatial resolution to replace traditionalHe tubes.</p> Methods <p>A novel detector design based on Silicon Photomultiplier (SiPM) readout is proposed, featuring a louver structurecomposed of oblique LiF/ZnS(Ag) scintillator screens. Key parameters of the detector, including the tilt angle of the scintillationscreen, the shape of the optical guide, and the pixel size of the SiPM, were optimized using the Geant4 software based on the MonteCarlo simulation method</p> Results <p>The simulation results identify an optimized detector configuration: 400 μm-thick LiF/ZnS(Ag) scintillation screens with a75 oblique angle, coupled with trapezoidal BK7 optical guides and SiPMs with a 3 mm × 3 mm pixel size. Using the center-of-gravitymethod for position calculation, this design achieves a spatial resolution of 0.64 mm. The detection efficiency for thermal neutronsexceeds 80%.</p> Conclusion <p>The proposed SiPM-based louver-structure neutron detector demonstrates high performance, achieving both highdetection efficiency (80%) and excellent position resolution (0.64 mm). This design presents a viable, high-performance, and costeffectivealternative to He tubes for future neutron scattering instruments.</p>

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A simulation research of the louver structure scintillator neutron detector with SiPM readout

  • 期刊论文

  • 发表日期：

    2025年11月5日

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  • Y.j. Wang,
  • C. Huang,
  • B. Tang,
  • D. W. Guo,
  • J. J. Fu,
  • Q. Yu,
  • S. J. Chen,
  • X. K. Wang,
  • H. Xu,
  • L. Yu,
  • Z. J. Sun,
  • Y. B. Chen

摘要

Purpose

The global shortage of He gas has created an urgent need for alternative thermal neutron detector technologies foradvanced neutron scattering instruments at large facilities like the China Spallation Neutron Source (CSNS). This paper aims todevelop a position-sensitive scintillator neutron detector with high detection efficiency and fine spatial resolution to replace traditionalHe tubes.

Methods

A novel detector design based on Silicon Photomultiplier (SiPM) readout is proposed, featuring a louver structurecomposed of oblique LiF/ZnS(Ag) scintillator screens. Key parameters of the detector, including the tilt angle of the scintillationscreen, the shape of the optical guide, and the pixel size of the SiPM, were optimized using the Geant4 software based on the MonteCarlo simulation method

Results

The simulation results identify an optimized detector configuration: 400 μm-thick LiF/ZnS(Ag) scintillation screens with a75 oblique angle, coupled with trapezoidal BK7 optical guides and SiPMs with a 3 mm × 3 mm pixel size. Using the center-of-gravitymethod for position calculation, this design achieves a spatial resolution of 0.64 mm. The detection efficiency for thermal neutronsexceeds 80%.

Conclusion

The proposed SiPM-based louver-structure neutron detector demonstrates high performance, achieving both highdetection efficiency (80%) and excellent position resolution (0.64 mm). This design presents a viable, high-performance, and costeffectivealternative to He tubes for future neutron scattering instruments.