光学法测量核聚变质子束能谱反演算法模拟研究  

Simulation Study on Unfolding Algorithm for Measuring Proton Beam Energy Spectrum of Nuclear Fusion Using Optical Imaging Method

作　　者：桑耀东 张清民 郭昊轩 朱康甫 谢朋佩 刘金良[2] SANG Yaodong;ZHANG Qingmin;GUO Haoxuan;ZHU Kangfu;XIE Pengpei;LIU Jinliang(Department of Nuclear Science and Technology,School of Energy and Power Engineering,Xi'an Jiaotong University,Xi'an,710049,China;National Key Laboratory of Intense Pulsed Radiation Environment Simulation and Effect,Northwest Institute of Nuclear Technology,Xi'an,710024,China;Shaanxi Key Laboratory of Advanced Nuclear Energy and Technology,Xi'an Jiaotong University,Xi'an,710049,China)

机构地区：[1]西安交通大学能源与动力工程学院核科学与技术学系,西安710049 [2]强脉冲辐射环境模拟与效应全国重点实验室(西北核技术研究所),西安710024 [3]陕西省先进核能技术重点实验室,西安710049

出　　处：《核电子学与探测技术》2025年第1期16-24,共9页Nuclear Electronics & Detection Technology

基　　金：国防科技卓越青年基金(2022-JCJQ-ZQ-011)资助。

摘　　要：以NIF装置D-T中子能谱为例,基于Geant4模拟构建了反冲质子能谱及能量响应矩阵,采用MLEM、OSL、GRAVEL、PRIP和MAXED算法反演获得了D-T中子对应的反冲质子能谱。结果表明:MLEM和GRAVEL算法的反演精度最高,且对测量数据的统计涨落要求较低;在同等计算资源配置下,MLEM、MAXED和PRIP算法的反演时间在秒量级,GRAVEL算法的反演时间则为几分钟;初始λ_(i)、响应矩阵和测量数据的幅值需要合理选择;OSL算法的反演精度低于MLEM算法;对含有高斯-椒盐混合噪声的图像进行中值滤波和BM3D算法去噪后,MLEM、GRAVEL和PRIP算法的反演精度满足要求。Taking the D-T neutron energy spectrum of NIF as an example,the recoil proton energy spectrum and energy response matrix are constructed based on Geant4 simulation.The corresponding recoil proton energy spectrum of D-T neutron is obtained using MLEM,OSL,GRAVEL,PRIP,and MAXED.The results show that the unfolding accuracy of MLEM and GRAVEL algorithms is the highest,and the requirement of statistical fluctuation of measurement data is low;under the same computing resource allocation,the unfolding time of MLEM,MAXED and PRIP algorithms is in the order of seconds,while the unfolding time of GRAVEL algorithm is in the order of minutes;the initial value ofλ_(i),the response matrix and the amplitude of measurement data needs reasonable selection.The unfolding accuracy of OSL algorithm is lower than that of MLEM algorithm.After median filtering and BM3D method denoising of image with Gaussian-salt mixed noise,the unfolding precision of MLEM,GRAVEL,and PRIP algorithm is satisfied.

关 键 词：反演算法 光学法 质子能谱 脉冲聚变中子能谱测量 

分 类 号：TL816[核科学技术—核技术及应用]