共振吸收加速电子的实验和模拟  

Experiment and simulation of hot electrons accelerated by resonance absorption

作　　者：蔡达锋[1] 王剑[1] CAI Dafeng;WANG Jian(Collegeof Physics and Electronic Information Engineering,Neijiang Normal University,Neijiang,Sichuan 641100,China)

机构地区：[1]内江师范学院物理与电子信息工程学院,四川内江641100

出　　处：《内江师范学院学报》2023年第6期67-71,共5页Journal of Neijiang Normal University

基　　金：四川省教育厅科研项目(07ZA045)。

摘　　要：采用超短超强激光与固体靶相互作用实验和数值模拟研究了超热电子的角分布和能谱,结果显示:绝大部分超热电子沿着靶法线方向附近发射;激光入射角为20°时等离子体对激光的吸收达到最强;由超热电子能谱拟合的有效温度与共振吸收超热电子的温度定标律一致.这说明在预等离子体密度标长较大的情况下对电子加速起主要作用的物理机制是共振吸收机制.The angular distribution and energy spectrum of the supra-thermal electrons are studied by means of numeric simulation and interactive experiment between ultrashort-and ultra-intense laser and solid target.Results show that most of the supra-thermal electrons emission radiates towards the direction of target normal or around;when the angle of incidence of the laser pulse is 20°,the maximal resonance absorption of the plasma over laser is achieved;the effective temperature of supra-thermal electrons fitted by the energy spectrum is consistent with a scaling law of the resonance absorption mechanism.Suffice it to say that the resonance absorption mechanism is dominating in electrons acceleration when the plasma has a long scale density profile.

关 键 词：激光 等离子体 共振吸收 超热电子 

分 类 号：O434.12[机械工程—光学工程]