Speaker
Dr
立朝 田
(epc)
Description
根据中国散裂中子源多功能反射谱仪的需求设计研制了一个以3He为中子转换体的基于多丝正比室的二维位置灵敏热中子探测器。探测器的有效面积为200mm × 200mm，采用高压闭气式工作模式，工作气体为6atm 3He + 2.5atm C3H8，通过重心法实现位置读出。该探测器在Am/Be中子源上进行了测试并对结果进行了分析，结果表明探测器具有良好的n/γ分辨能力以及位置线性。但是由于Am/Be的通量较低以及复杂本底的干扰，目前测试位置分辨为σ=4.9mm。预计在准直热中子束上会有更好的结果。
关键字 中子探测器，多丝正比室，Am/Be中子源，性能测试
Abstract: A thermal neutron detector with a sensitive area of 200mm × 200mm originated from the Multi-Wire Proportional Chamber (MWPC) based on the 3He convertor was constructed for the Multifunction Reflection Spectrometer of China Spallation Neutron Source. It operates with a gas mixture of 6atm. 3He + 2.5atm. C3H8 filled in a high pressure chamber. Gravity center readout system was used to reconstruct the neutron position. The detector was tested on the Am/Be neutron source. The results show good n/γ discrimination and position linearity. But only a position resolution of σ=4.9mm was obtained since the low intensity neutron source and high background. A much better position resolution would be achieved on a high intensity thermal neutron beam.
Keywords: Neutron Detector, MWPC, Am/Be neutron source, Performance test
Primary author
Dr
立朝 田
(epc)
