强激光与粒子束, 2015, 27 (6): 062005, 网络出版: 2015-06-17
用于神光Ⅲ主机燃料面密度诊断的下散射法探测系统的准直设计
Collimator design for fuel areal density diagnosis via down-scattered neutrons measurement on SG-Ⅲ facility
摘要
在惯性约束聚变实验中,用下散射法诊断燃料面密度对本底的屏蔽要求较高.分析了神光Ⅲ主机纯氘燃料靶在实际诊断环境中产生的本底辐射场,通过蒙特卡罗方法得知测量点处散射本底主要来源于初级中子与真空腔室、周围诊断平台、天花板和地板的作用.据此分析选取合适的材料和屏蔽方案.通过模拟计算,得到尺寸优化后的准直器设计方案,该方案达到了实验要求.
Abstract
In the inertial confinement fusion (ICF) experiment,down-scattered neutrons for fuel areal density measurement need to be separated from other background.The background on Shenguang Ⅲ facility is analyzed in detail by Monte Carlo for the DD fuel.As a result,the background is mostly from the process that primary neutrons scatter through vacuum chamber,surrounding diagnostic platforms,ceiling and floor.According to the analysis,appropriate materials and shielding solution are chosen.And the structure of the collimator is optimized by Monte Carlo.The design meets the experimental requirements.
黄展常, 杨建伦, 陈法新. 用于神光Ⅲ主机燃料面密度诊断的下散射法探测系统的准直设计[J]. 强激光与粒子束, 2015, 27(6): 062005. Huang Zhanchang, Yang Jianlun, Chen Faxin. Collimator design for fuel areal density diagnosis via down-scattered neutrons measurement on SG-Ⅲ facility[J]. High Power Laser and Particle Beams, 2015, 27(6): 062005.
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