Study of uniform drift electric field used for boron-lined honeycomb neutron detector-猫眼课题宝

硼衬蜂窝中子探测器均匀漂移电场研究

DOI：

10.1016/j.nima.2018.10.109

发表时间：

2020-02

期刊：

Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment

影响因子：

通讯作者：

中科院分区：

其他

文献类型：

作者：

Zhujun Fang;Yigang Yang;Yulan Li;Zhi Zhang;Xuewu Wang

提出了一种以硼衬蜂窝为中子转换器的热中子探测器设计，它可能是一种用于中子散射的3 He替代探测器。由于电子迁移过程的影响，这种探测器需要高均匀性的漂移电场，从而简化了探测器的结构，提高了探测器的鲁棒性。为了研究各参数对漂移电场的影响，进行了加菲猫9和麦克斯韦11模拟。模拟结果表明，场笼间距和场条宽度决定了漂移电场的均匀性。并对硼衬蜂窝中子探测器的场笼结构进行了优化设计，场笼间距为2 mm，内场条宽为1.5mm，外镜场条宽为0.5mm。中子实验结果表明，电子迁移效率提高了12.4%，中子探测效率提高了26%，证明了场笼优化和提高漂移电场均匀性的有效性。

A thermal neutron detector design with a boron-lined honeycomb as the neutron converter was proposed, which.can be probably a 3He alternative detector used in neutron scattering. This detector demands a high uniformity.drift electric field due to the electron migration process, which simplifies the detector structure and improves.the detector robustness. To research the influencing parameters to the drift electric field, the Garfield 9 and.Maxwell 11 simulations were carried out. The simulation results demonstrated that both the field-cage pitch and.the width of field strips determined the uniformity of drift electric field. The field-cage with optimized structure.for the boron-lined honeycomb neutron detector was also designed, with 2 mm pitch, 1.5 mm width of inner field.strip and 0.5 mm width of outer mirror field strip. The result of neutron experiment shows an electron migration.efficiency increase of 12.4% and a neutron detection efficiency increase of 26%, demonstrating the effectiveness.of field-cage optimization and drift electric field uniformity promotion.