Status of the two-dimensional, multi-wire proportional chamber detector for the China Spallation Neutron Source
Status of the two-dimensional, multi-wire proportional chamber detector for the China Spallation Neutron Source
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DOI：
10.1142/s2010194518601217
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发表时间：
2018
期刊：
影响因子：
--
通讯作者：
Z. Wen;H. Qi
中科院分区：
文献类型：
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作者：
Z. Wen;H. Qi
针对正在建设中的广东中国散裂中子源的多功能反射光谱探测要求，研制了基于He-3工作气体的二维多丝正比室探测器。这种高效的热中子探测器具有大面积(200 mm×200 mm有效面积)、二维位置灵敏(在1.8埃波长下为65%)和良好的n/伽马分辨能力，可以满足CSNS的某些要求。中子探测器由一个MWPC探测器和一个高压气体容器组成。在前期设计和试验的基础上，对探测器和气体净化装置的读线结构进行了优化。重新设计了MWPC探测器，吸收层厚度为10 mm，工作气体为He-3和C3H8，工作气压为8.5大气压。使用世伟洛克制造的止回阀，开发了气体净化装置，以净化水和去除气体杂质。每个序列的有效循环时间可达50分钟。以X射线辐射源和中子源为例，研究了传统重心读出方法的位置分辨率和二维成像精度的性能。今年年底，探测器将安装在CSNS，并使用中子源进行研究。
The re-designed two-dimensional, multi-wire proportional chamber (MWPC) detector based on the He-3 operation gas has been developed for the multifunctional reflection spectrum detection requirements in China Spallation Neutron Source (CSNS), which is under construction in Guangdong province, China. This efficient thermal neutron detector with large area (200 mm x 200 mm active area), two-dimensional position sensitive ( 65% in the wavelength of 1.8 angstrom) and good n/gamma discrimination would meet some requirements in CSNS. The neutron detector consists of a MWPC detector and a high-pressure gas vessel. The wire readout structures of the detector and the gas purity device have been optimized based on previous design and testing. The re-designed MWPC detector with an absorber thickness of 10 mm and 8.5 atm operating gas mixture of He-3 and C3H8 was constructed. Using the non-return valve manufactured by Swagelok, the gas purity device was developed to clean the water and remove gas impurities. The effective cycle time can be up to 50 min per sequence. The performance of the position resolution and the two-dimensional imaging accuracy by the traditional center of gravity readout method was studied with an X-ray radiation source and the neutron source. At the end of this year, the detector will be mounted at CSNS and studied using the neutron source.