Readout of the time signals of the MWPC detector with boron sensitive thermal neutron
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摘要: 基于10B薄膜的二维灵敏探测器是新近发展起来的热中子探测器，其灵敏面积大，时间和位置分辨好，n/抑制能力高，抗辐射能力强，可二维读出且具有良好的耐计数能力。针对新型的涂硼灵敏热中子多丝正比（MWPC）探测器，在延迟线时间差方法的基础上，提出一种中子击中位置数字信息的读出方法，并设计NIM读出插件用以验证该方法对于二维中子探测位置信息的读出能力。测试结果表明，本方法能完成4通道探测器信号的实时测量，其时间测量精度好于50 ps。结合FPGA片上系统实时数据控制和处理技术，单插件可支持最高1.3MHz的探测计数率。Abstract: The two dimensional sensitive detector based on 10B film is a newly developed thermal neutron detector with the advantages of large sensitive area, good time and position resolution, high n/ inhibition ability, strong ability of anti-radiation, two-dimensional readout and good resistance to the count rate capability. So it is important to carry out the study of the readout method of the two-dimensional position sensitive neutron detector based on the B neutron transfer layer and MWPC structure. In this paper, a readout board based on delay-line readout method is presented. By measuring the time difference between the arriving signals on both sides of delay-line, the original position can be well recovered. By applying a hardwire filter in FPGA, the data rate needs to be transferred can be reduced remarkably. The RMS of the TDC is less than 50 ps. The integral nonlinearity is better than 1.1 LSB, the differential non-linearity is better than 0.5 LSB. The board achieves event rates of 1.3 MHz for periodic signals and the data can be transferred by Gbit ethernet daughter board simultaneously.
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Key words:
- delay-line /
- two-dimensional readout /
- FPGA /
- neutron detector
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