研究目的
Developing a solid-state position sensitive neutron detector prototype based on 6Li-glass scintillator and digital SiPM arrays to overcome limitations of PMT-based detectors, such as sensitivity to magnetic fields and high operating voltages, and to achieve a spatial resolution of 1 mm × 1 mm and a neutron counting rate of 20 Mcps/m2 for use in neutron reflectometry experiments.
研究成果
The simulations indicate that a 1 mm thick GS20? scintillator glass combined with a 1 mm thick disperser glass of refractive index 1.5 and a polished aluminum cap can achieve the target spatial resolution of 1 mm × 1 mm. This configuration provides sufficient light distribution across SiPM pixels for accurate position reconstruction. Future work involves experimental testing at the TREFF instrument to validate the design and performance.
研究不足
The study is based on simulations and a prototype; experimental validation is pending. Radiation damage to SiPMs over long-term use is a concern, though prior studies suggest it may be manageable. The design may have sensitivity to gamma rays, and further optimization of the neutron positioning algorithm is needed.
1：Experimental Design and Method Selection:
The study involves designing a neutron detector prototype using Geant4 simulations for optical front-end optimization. The detector consists of a scintillator glass, a disperser glass, and digital SiPM arrays. Simulations model neutron interactions, light propagation, and photon detection to optimize parameters like disperser thickness and refractive index.
2：Sample Selection and Data Sources:
The scintillator used is GS20? 6Li glass from Scintacor, with a thickness of 1 mm. Disperser glass is PGO-D263 T eco. Neutron beams with wavelength λ = 4.78 ? and energy E = 3.58 meV are simulated, with 10,000 neutron events per parameter set.
3：78 ? and energy E = 58 meV are simulated, with 10,000 neutron events per parameter set.
List of Experimental Equipment and Materials:
3. List of Experimental Equipment and Materials: Equipment includes GS20? scintillator glass, PGO-D263 T eco disperser glass, Panacol-Vitralit 1605 glue, Eljen EJ-552 gel, PDPC digital SiPM arrays (DPC3200-22-44 tiles), Peltier elements (Eureca - TEC1SE-55-55-280/78), heat sink, fan, and aluminum cap. Materials have specified refractive indices and thicknesses.
4：Experimental Procedures and Operational Workflow:
Simulations are conducted using Geant4 with physics lists for neutron interactions, energy deposition, and optical physics. Photon propagation is tracked, and data on photon positions and times are stored for analysis. The setup includes interfaces between materials to ensure efficient light transport.
5：Data Analysis Methods:
Analysis involves calculating the average number of triggered cells and the full width at half-maximum (FWHM) of photon distributions. Results are used to determine optimal disperser thickness and refractive index for achieving the desired spatial resolution.
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