D^(3)He爆推靶质子源优化模拟研究  

Optimized simulation of D^(3)He proton source for exploding pusher target

作　　者：徐秋月 周佳欣 单连强[1] 田超[1] 杨祖华[1] 张天奎[1] 王为武[1] 滕建[1] 邓志刚[1] 袁宗强 张锋[1] 齐伟[1] 刘东晓[1] 范全平[1] 魏来[1] 周维民[1] 谷渝秋[1] Xu Qiuyue;Zhou Jiaxin;Shan Lianqiang;Tian Chao;Yang Zuhua;Zhang Tiankui;Wang Weiwu;Teng Jian;Deng Zhigang;Yuan Zongqiang;Zhang Feng;Qi Wei;Liu Dongxiao;Fan Quanping;Wei Lai;Zhou Weimin;Gu Yuqiu(Science and Technology on Plasma Physics Laboratory,Laser Fusion Research Center,CAEP,Mianyang 621900,China;School of Physics,Peking University,Beijing 100871,China)

机构地区：[1]中国工程物理研究院激光聚变研究中心等离子体物理重点实验室,四川绵阳621900 [2]北京大学物理学院,北京100871

出　　处：《强激光与粒子束》2022年第12期46-52,共7页High Power Laser and Particle Beams

基　　金：国家自然科学基金项目(11875048,11905203);等离子体物理重点实验室基金项目(6142A04200104)。

摘　　要：为了在百kJ高功率激光装置上建立D^(3)He质子照相平台,采用一维辐射流体程序Helios-CR对D^(3)He爆推靶质子产生进行了模拟,综合考虑多种因素给出在百千焦高功率激光装置上开展质子照相所需要的激光和靶球建议参数。结合激光装置现有条件,分析了在10^(15) W/cm^(2)左右激光强度下D^(3)He质子产额随靶球半径、激光强度、充气压力和SiO_(2)球壳厚度等参数的变化规律,给出了靶球半径300μm,内充D^(3)He气体压强1.8 MPa,SiO_(2)球壳厚度3.5μm左右等优化参数,预计此条件下D^(3)He质子产额可达10^(9)~10^(10)。通过模拟得到的质子产额变化规律,为质子照相平台的正式建立和实验参数选取提供了参考。To establish a monochromatic high-energy proton photography platform on high power laser device with hundreds of kilojoules,D^(3)He gas-filled spherical SiO_(2) glass pellets,irradiated by an absorbed laser intensity of 10^(15) W/cm^(2) have been considered and the exploding pusher target simulation has been conducted with Helios-CR to design an optimum target,which couples to the incident laser light more effectively to produce the optimum number of protons.By varying the inner radius of the target,the laser intensity and the thickness of the spherical shell,the optimal laser conditions and target parameters for photography under the condition of our laser device are obtained.The simulation results give a suitable experimental parameter of 300μm target ball radius,1.8 MPa filled D^(3)He gas and 3.5μm SiO_(2) spherical shell thickness.In addition,we also considered the influence of laser driving symmetry and kinetic effect on the simulation results.Taking the optimal parameters obtained by simulation as the input,it is expected that 10^(9)–10^(10) proton yield can be obtained experimentally.The law of proton yield variation obtained through simulation provides a reference for the formal establishment of the proton photography platform and the selection of experimental parameters.

关 键 词：直接驱动 爆推靶 单色质子源 

分 类 号：O539[理学—等离子体物理]