2维位置灵敏中子探测器读出
Readout of two-dimensional position-sensitive neutron detector
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摘要: 介绍了基于厚型气体电子倍增探测器(THGEM)的位置灵敏热中子探测器中，采用专用集成电路的阵列电荷灵敏前置放大和可编程器件的读出电子学设计。专用集成电路采用VA64TA2，64通道输入电荷灵敏放大成型，触发输出。控制电路使用了现场可编程器件。两者结合，显著减少了读出电路在探测器内所占据的空间。介绍了VA64TA2裸片的封装，给出了电路的原理和时序，进行了线性和电子学噪声试验，结果表明电路具有16 fC的线性动态范围，电子学噪声仅为75个电子电荷。Abstract: The design of readout electronics based on multi-channel charge-sensitive pre-amplifier application specific integrated circuit(ASIC) are introduced，which is to be applied in the two-dimensional position-sensitive thermal neutron detector based on thick gas electron multiplier(THGEM). The ASIC is VA64TA2, a bare chip with 64 channels of charge sensitive preamplifier-shaper circuits and every channel with the function of trigger. These chips are packaged with the ceramic pin grid array package CPGA257, with 257 pints. The readout electronics is controlled by FPGA. The results of single-channel linear performance test and electronics noise performance test are given. The results show that the readout system has good linearity with the dynamic range of 16 fC, and low electronics noise of 1.2
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Key words:
- thermal neutron /
- detection /
- position sensitive /
- readout /
- microstructure /
- thick gas electron multiplier
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