CCD质子辐照损伤效应的三维蒙特卡罗模拟  

Numerical calculation and analysis of proton radiation effects on CCD based on Monte Carlo method

作　　者：薛院院 王祖军[1] 刘静 何宝平[1] 姚志斌[1] 刘敏波[1] 盛江坤 马武英[1] 董观涛 金军山 

机构地区：[1]西北核技术研究所,强脉冲辐射环境模拟与效应国家重点实验室,西安710024 [2]湘潭大学材料科学与工程学院,湖南湘潭411105

出　　处：《强激光与粒子束》2018年第4期83-88,共6页High Power Laser and Particle Beams

基　　金：国家自然科学基金项目(11305126,11235008)

摘　　要：针对空间质子诱发CCD性能退化问题,开展了CCD质子辐照效应的三维蒙特卡罗模拟研究。采用三维蒙特卡罗软件Geant4模拟计算了不同能量质子在Si和SiO_2中的射程及Bragg峰,分析了不同能量质子在材料中能量沉积的过程,并将模拟结果与相关数据进行对比,模拟误差在5%以内。根据质子与材料相互作用的物理过程,选取了合适的Lindhard分离函数,添加合适的物理过程,模拟计算了不同能量质子在SiO_2中的电离能量损失和Si中的非电离能量损失,并将结果与国外相关数据进行对比。根据CCD的生产工艺参数,建立了单个像元的三维模拟模型,确定了质子辐照损伤的灵敏体积,模拟计算了不同能量质子在像元灵敏体积内的电离能量沉积与非电离能量沉积,分析了CCD不同能量质子的辐照损伤差异产生的机理。结合粒子输运计算结果与CCD质子辐照实验结果,分析了质子辐照诱发CCD辐射敏感参数退化的物理机制。Numerical calculation and analysis of proton radiation effects on CCD based on Monte Carlo method were developed by Geant4,a 3-D Monte Carlo code.The projected ranges and Bragg peaks of protons in Si and SiO_2 were calculated and the results were in good agreement with the reference data.The ionizing energy losses of protons in SiO_2 and non-ionizing energy losses in Si were also calculated and the results were in good agreement with the reference data.The detailed geometry model of the pixel of CCD was established.The ionizing energy deposition and non-ionizing energy deposition in the sensitive region of CCD caused by protons at different energy were calculated.The proton radiation effects on CCD were analyzed by combining experiment results and the numerical calculation.The achievements of this paper provide a basis of theories for CCD radiation degradation mechanisms and radiation damage evaluation study.

关 键 词：电荷耦合器件(CCD) 质子 GEANT4 电离能量沉积 非电离能量沉积 

分 类 号：TN386.5[电子电信—物理电子学] TN43