用于神光Ⅲ燃料面密度诊断的下散射中子探测系统设计

黄展常; 杨建伦

doi:doi:10.11884/hplpb201527.074001

强激光与粒子束, 2015, 27 (7): 074001, 网络出版: 2015-07-10

用于神光Ⅲ燃料面密度诊断的下散射中子探测系统设计

Design of down-scattered neutron detection system for fuel areal density diagnosis on SG-Ⅲ facility

论文大纲

黄展常 ^*杨建伦

作者单位

中国工程物理研究院核物理与化学研究所, 四川绵阳 621900

下散射中子 DD中子下散射中子探测器 down-scattered neutrons DD neutron Geant4 Geant4 down-scattered neutron detector

摘要

根据辐射屏蔽后5.5 m测点处的辐射场情况,分别设计了电流型探测器系统和成像型探测器系统.通过Geant4数值模拟分析可得:在面密度达到10 mg/cm2、初级中子产额为1012时,电流型探测器系统满足测量的信噪比,信噪比达到40∶1;在面密度达到10 mg/cm2、初级中子产额为1011时,成像型探测器系统满足测量的信噪比,信噪比好于10∶1;面密度增大时,信噪比有所改善;但是当初级中子产额达到1012时,出现中子信号重叠现象,可通过缩短曝光时间或者减小塑料闪烁体厚度来降低中子重叠率.

Abstract

A current-mode detection system and an imaging detection system are designed according to the radiation level at 5.5 m from the target with shielding collimator.The two systems are simulated by Geant4.When the areal density is 10 mg/cm2 and the primary neutron yield is 1012,the current-mode detection system can be used for fuel areal density diagnosis with a signal to noise ratio(SNR) of 40∶1.When the areal density is 10 mg/cm2 and the primary neutron yield is 1011,the imaging detection system can be used for fuel areal density diagnosis with an SNR of 10∶1.If the areal density increases,the SNR is better.However,when the primary neutron yield is 1012,the neutron overlapping occurs.The overlapping probability can be reduced by shortening the exposure time or decreasing the thickness of the plastic scintillator.

参考文献

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黄展常, 杨建伦. 用于神光Ⅲ燃料面密度诊断的下散射中子探测系统设计[J]. 强激光与粒子束, 2015, 27(7): 074001. Huang Zhanchang, Yang Jianlun. Design of down-scattered neutron detection system for fuel areal density diagnosis on SG-Ⅲ facility[J]. High Power Laser and Particle Beams, 2015, 27(7): 074001.

用于神光Ⅲ燃料面密度诊断的下散射中子探测系统设计

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