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中国散裂中子源将建设一台基于~3He气体的二维多丝室,作为多功能反射谱仪束线的中子探测器.基于已有的研究,为优化选择二维多丝室探测器的丝结构,本文研究了三种不同的丝结构,并采用重心读出方法和数字读出方法进行了探测器的性能测量,得到了满足多功能反射谱仪探测器需求的读出方法.实验结果表明:对同种丝结构的二维多丝室探测器,重心读出方法的位置分辨和成像性能都好于数字读出方法;基于重心法读出的多丝室探测器位置分辨率可以达到约160μm,基于数字读出方法的多丝室探测器位置分辨率可以达到约400μm.优化设计的丝结构为:基于重心读出法的阳极丝间距1.5 mm、读出通道间距4 mm,基于数字读出法的阳极丝间距1.5 mm、读出通道间距2 mm.优化设计的丝结构均能满足谱仪的位置分辨要求.
The Chinese spallation neutron source will construct a 2-D multi-filament chamber based on ~ 3He gas as a neutron detector for the multi-functional reflection spectrometer beam line.Based on the existing research, two-dimensional multi- In this paper, three different wire structures were studied. The performance of the detector was measured by using the gravity center readout method and the digital readout method. The readout method to meet the requirements of the detector of multifunctional reflectance spectrometer was obtained. The experimental results show that the position resolution and imaging performance of the two-dimensional multi-wire chamber detector with the same kind of fiber structure are better than that of the digital readout method. The multi-wire chamber detector position resolution Up to about 160μm, the position resolution of the multi-wire chamber detector based on the digital readout method can reach about 400μm.The optimal design of the wire structure is that the anode wire spacing based on the centroid readout method is 1.5 mm, the readout channel spacing is 4 mm, Based on the digital readout method, the anode wire spacing is 1.5 mm and the readout channel spacing is 2 mm. The optimal design of the wire structure can meet the position resolution requirements of the spectrometer.