高分辨^(6)LiF/ZnS中子闪烁体探测器读出电子学研制

Development of Readout Electronics for High Resolution^(6)LiF/ZnS Neutron Scintillator Detector

能量分辨中子成像谱仪是中国散裂中子源的在建谱仪,其衍射探测器90°分区采用^(6)LiF/ZnS中子探测器作为探测设备,对成像空间分辨能力提出了更高的要求。为了提高中子闪烁体探测器的位置分辨能力,电子学系统提出了利用重心法实现数据采集电路,并研制了配套的读出电子学样机。该系统主要包括数据采集电路、前置放大电路和数字读出电路3个部分,分别实现:高效采集^(6)LiF/ZnS中子探测器发送的数据、将探测器探测到的微弱信号进行放大整形、处理经放大滤波后的信号。在实验室分别利用万用表、示波器和信号产生器对电子学系统调试完成后,最后在中国散裂中子源20号束线带束进行了相关参数测试,束线测试结果表明,探测器位置分辨能力达2 mm,满足工程设计指标。

The constructing Energy Resolved Neutron Imaging(ERNI)spectrometer at the China Scattering Neutron Source uses a^(6)LiF/ZnS neutron detector as the detection device for its diffraction detector 90°partition,which places higher requirements on the imaging spatial resolution.To improve the position resolution of the neutron scintillator detector,an electronics system method was proposed with implementation of a data acquisition circuit using the center of gravity method and a supporting readout electronics prototype was developed.The system consists of three main parts:a data acquisition circuit,a pre-amplification circuit and a digital readout circuit.They can achieve respectively the functions as:efficient acquisition of data sent by the^(6)LiF/ZnS neutron detector,amplification and shaping of the weak signals detected by the detector,and processing of the amplified and filtered signals.After debugging the electronics system in the laboratory using a multimeter,an oscilloscope and a signal generator,the relevant parameters were finally tested in the China Scattered Neutron Source#20 beamline strip beam.The beamline test results showed that the position resolution of the detector reached 2mm and met the engineering design specifications.