High Power Laser and Particle Beams, Volume. 35, Issue 11, 119002(2023)
Engineering reliability design and improvement for pulsed neutron scintillation detector
Figures & Tables(6)
Table 1. Reliability index distribution of pulsed neutron detector
View tableView in ArticleTable 1. Reliability index distribution of pulsed neutron detector
No functional unit reliability distribution value notes 1 scintillator 0.9999 It is almost impossible to fail below the softening temperature. 2 high voltage module 0.999 0 — 3 high voltage divider 0.999 0 — 4 PMT 0.980 0 Sensitive to the environment and has a history of failures. 5 amplifier 0.990 0 Has a history of failures. 6 connecting system 0.990 0 Has a history of failures. total — 0.9982 —
Table 2. FMECA table of the pulsed neutron detector (PMT part)
View tableView in ArticleTable 2. FMECA table of the pulsed neutron detector (PMT part)
function failure mode cause of failure effects of the failure severity probability level fault detection methods compensation measures local and higher level effects final effects photoelectric conversion and electronic multiplication anode output sensitivity decreases cathode poisoning / MCP resistance change / vacuum decrease the decrease of sensitivity of PMT leads to the decrease of neutron sensitivity The test task failed or the test result showed a large deviation. II C self inspection/neutron sensitivity test monitor the storage performance of the multiplier tube and install it after stabilization anode output discharge decrease of vacuum / interelectrode voltage resistance anode abnormal output damaged amplifier, no neutron signal output The test task failed or the test result showed a large deviation. II C self inspection/neutron sensitivity test strengthen the screening of multiplier tubes and design discharge protection circuits anode output drift exceeds the prescribed limit temperature drift of resistance of MCP neutron sensitivity distortion There is a big deviation in the test results. II C neutron sensitivity testing during temperature testing improving microchannel board resistance and optimizing voltage divider circuits
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Liehua Ma, Shuang Chen, Hongtao Li, Xusheng Peng, Botao Zhang, Bo Li, Cheng Wang, Jie Ai. Engineering reliability design and improvement for pulsed neutron scintillation detector[J]. High Power Laser and Particle Beams, 2023, 35(11): 119002
Paper Information
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Received: May. 13, 2023
Accepted: Oct. 23, 2023
Published Online: Dec. 26, 2023
The Author Email: Ai Jie (aj_caomu@126.com)
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