针对位置灵敏涂硼稻草管中子探测器的读出电子学设计
Readout electronics for position sensitive boron coated straw detector

涂硼稻草管中子探测器将替代3He管探测器应用在清华大学微型脉冲强子源(CPHS)小角散射谱仪上。该文设计了针对该新型位置灵敏中子探测器的读出电子学系统, 通过分析探测器和前端电路的噪声, 得出了位置分辨率的估算方法, 并结合根据探测器输出信号特征优化了电路参数。对1.0 m长的涂硼稻草管及其读出电子学系统分别进行了电荷注入测试和中子束流测试, 位置分辨率的测试结果分别为2.7 mm和4.5 mm。实验结果表明:涂硼稻草管及其读出电子学系统的性能可以满足CPHS小角散射谱仪对中子位置测量的需求。
Abstract：Boron coated straw neutron detectors are being developed for use in the small-angle neutron scattering (SANS) instrument of the compact pulsed hadron source (CPHS) in Tsinghua University. This paper describes the readout electronics system for the position sensitive detector. The position resolution is estimated based on a noise analysis of the detector and the front end electronics. Then, the circuit parameters are optimized to improve the output signal characteristics. The position resolution of the detector and the readout electronics were evaluated using a charge injection test and a neutron beam test, with a position resolution of 2.7 mm in the charge injection test and 4.5 mm in the neutron beam test. The results that the detector and readout electronics meet the requirements for the neutron position measurement in the CPHS SANS instrument.