基于延迟块读出的多丝正比室探测器的研制
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摘要
为了验证延迟块读出法(Delay-line Readout Method)在大面积中子探测器位置测量中的可行性,研制了一整套应用于中国散裂中子源(China Spallation Neutron Source,CSNS)工程的二维位置灵敏多丝正比室(Multi-wire Proportional Chamber,MWPC)探测器原型样机。入射粒子在探测器中的位置信号首先通过一组5 ns延迟块在相反两端输出,再进入高精度时数转换器(Time to Digital Converter,TDC)电子学系统,转换为时间差数字信号的方式记录下来,最后运用root软件进行数据分析。分析结果表明:从绘制的二维图中能看到α源3个不同位置坐标,与α源的摆放位置一致且位置分辨均好于2 mm,说明研制出的MWPC探测器与延迟块读出法能完美匹配起来,达到高精度的位置测量需求。
[Background] A neutron sensitive multi-wire proportional chamber(MWPC) is one of important components for the CSNS's(China spallation neutron source) construction.In terms of large-area neutron detectors, the delay-line readout method is a new type of signal readout method. [Purpose] This study aims to design and implement a 200 mm×200 mm sensitive area MWPC prototype with a delay-line readout system to verify the feasibility of the delay-line readout method. [Methods] An unified anode readout and two channel for each cathode signal are implemented with the MWPC. At first we put α radiation sources in three different positions of the neutron detector, the position information of the incident particle what these sources scattering into the detector contained by the induced signal in cathode. After avalanche, spreads through a series of 5 ns modules to the opposite ends, a high precision time to digital converter(TDC) is employed for determining arrival time, from which the incident position can be derived. Finally, the root software is used for data analysis so as to verify the position performance of this MWPC. [Results] The preliminary results with the α radiation source testing showed the position resolution is better than 2 mm which achieved by this proposed MWPC. [Conclusion] The developed MWPC detector can successfully perform position measurement. Meanwhile, it is good to verify the feasibility of the delay-line readout method in the measurement of large-area neutron detectors.
[Background] A neutron sensitive multi-wire proportional chamber(MWPC) is one of important components for the CSNS's(China spallation neutron source) construction.In terms of large-area neutron detectors, the delay-line readout method is a new type of signal readout method. [Purpose] This study aims to design and implement a 200 mm×200 mm sensitive area MWPC prototype with a delay-line readout system to verify the feasibility of the delay-line readout method. [Methods] An unified anode readout and two channel for each cathode signal are implemented with the MWPC. At first we put α radiation sources in three different positions of the neutron detector, the position information of the incident particle what these sources scattering into the detector contained by the induced signal in cathode. After avalanche, spreads through a series of 5 ns modules to the opposite ends, a high precision time to digital converter(TDC) is employed for determining arrival time, from which the incident position can be derived. Finally, the root software is used for data analysis so as to verify the position performance of this MWPC. [Results] The preliminary results with the α radiation source testing showed the position resolution is better than 2 mm which achieved by this proposed MWPC. [Conclusion] The developed MWPC detector can successfully perform position measurement. Meanwhile, it is good to verify the feasibility of the delay-line readout method in the measurement of large-area neutron detectors.
引文
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3温志文.二维多丝室结构优化及性能研究[D].兰州:兰州大学,2017.WEN Zhiwen.Readout method for two-dimensional multi-wireproportional chamber[D].Lanzhou:Lanzhou University,2017.
4潘景辉.一种多层涂硼MWPC的高分辨2D位置灵敏热中子探测器的研制[D].衡阳:南华大学,2016.PAN Jinghui.Development of a multi-layer coated 10Bhigh resolution 2D position sensitive thermal neutron detector based on MWPC[D].Hengyang:University of South China,2016.
5杨波.新型涂硼热中子MWPC探测器的时间信号读出方法[J].强激光与粒子束,2016,28(10):151?156.DOI:10.11884/HPLPB201628.151304.YANG Bo.Readout of the times signals of the MWPCdetector with boron sentsitive thermal neutron[J].High Power Laser and Particle Beam,2016,28(10):151?156.DOI:10.11884/HPLPB201628.151304.
6孙维佳.涂硼MWPC热中子探测器信号读出方法研究[D].合肥:中国科学技术大学,2016.SUN Weijia.Research on readout method of boron-coated MWPC for thermal neutron detection[D].Hefei:University of Science and Technology of China,2016.
7王艳凤.涂硼GEM中子束监测器的模拟研究[D].武汉:华中师范大学,2011.WANG Yanfeng.Simulation study of a neutron beam monitor based on boron-coated GEM[D].Wuhan:Huazhong Normal University,2011.
8 Han L Y,Li Q T,Faisal Q,et al.Study of delay-line readout for GEM detector[J].Chinese Physics C,2009,33(5):364?368.
9 Yi Z,Cheng L,Yong J S.Study of a multi-wire proportional chamber with a cathode strip and delay-line readout[J].Nuclear Instruments and Methods in Physics Research A,2009,604:71-76.
10 Czascha A,Milnes J,Hay N,et al.Position-and time-sensitive single photon detector with delay-line readout[J].Nuclear Instruments and Methods in Physics Research A,2007,580(2):1066-1070.DOI:10.1016/j.nima.2007.06.063.
11 Guedes G P,Breskin A,Chechik R,et al.Two-dimensional GEM imaging detector with delay-line readout[J].Nuclear Instruments and Methods in Physics Research A,2003,513(3):473-483.DOI:10.1016/S0168-9002(03)02017-5.
12 Gabriel A,Dauvergne F,Nolting H F,et al.Energy resolution using delay line detectors[J].Nuclear Instruments and Methods in Physics Research A,1994,349(349):461?465.DOI:10.1016/0168-9002(94)91211-4.
2孟祥厅,李东仓,杨磊,等.基于延迟线的二维读出多丝正比室电路[J].核技术,2011,34(11):856?859.MENG Xiangting,LI Dongcang,YANG Lei,et al.Adelay line-based two dimensional readout circuit of multi-wire proportional chamber[J].Nuclear Techniques,2011,34(11):856?859.
3温志文.二维多丝室结构优化及性能研究[D].兰州:兰州大学,2017.WEN Zhiwen.Readout method for two-dimensional multi-wireproportional chamber[D].Lanzhou:Lanzhou University,2017.
4潘景辉.一种多层涂硼MWPC的高分辨2D位置灵敏热中子探测器的研制[D].衡阳:南华大学,2016.PAN Jinghui.Development of a multi-layer coated 10Bhigh resolution 2D position sensitive thermal neutron detector based on MWPC[D].Hengyang:University of South China,2016.
5杨波.新型涂硼热中子MWPC探测器的时间信号读出方法[J].强激光与粒子束,2016,28(10):151?156.DOI:10.11884/HPLPB201628.151304.YANG Bo.Readout of the times signals of the MWPCdetector with boron sentsitive thermal neutron[J].High Power Laser and Particle Beam,2016,28(10):151?156.DOI:10.11884/HPLPB201628.151304.
6孙维佳.涂硼MWPC热中子探测器信号读出方法研究[D].合肥:中国科学技术大学,2016.SUN Weijia.Research on readout method of boron-coated MWPC for thermal neutron detection[D].Hefei:University of Science and Technology of China,2016.
7王艳凤.涂硼GEM中子束监测器的模拟研究[D].武汉:华中师范大学,2011.WANG Yanfeng.Simulation study of a neutron beam monitor based on boron-coated GEM[D].Wuhan:Huazhong Normal University,2011.
8 Han L Y,Li Q T,Faisal Q,et al.Study of delay-line readout for GEM detector[J].Chinese Physics C,2009,33(5):364?368.
9 Yi Z,Cheng L,Yong J S.Study of a multi-wire proportional chamber with a cathode strip and delay-line readout[J].Nuclear Instruments and Methods in Physics Research A,2009,604:71-76.
10 Czascha A,Milnes J,Hay N,et al.Position-and time-sensitive single photon detector with delay-line readout[J].Nuclear Instruments and Methods in Physics Research A,2007,580(2):1066-1070.DOI:10.1016/j.nima.2007.06.063.
11 Guedes G P,Breskin A,Chechik R,et al.Two-dimensional GEM imaging detector with delay-line readout[J].Nuclear Instruments and Methods in Physics Research A,2003,513(3):473-483.DOI:10.1016/S0168-9002(03)02017-5.
12 Gabriel A,Dauvergne F,Nolting H F,et al.Energy resolution using delay line detectors[J].Nuclear Instruments and Methods in Physics Research A,1994,349(349):461?465.DOI:10.1016/0168-9002(94)91211-4.