相对论热等离子体中电子声波的非线性频移  

Nonlinear frequency shift of electron acoustic waves in relativistic hot plasma

作　　者：钱平通 张小波 黄茂 薛具奎[1] Qian Pingtong;Zhang Xiaobo;Huang Mao;Xue Jukui(College of Physics and Electronic Engineering,Northwest Normal University,Lanzhou 730070,China;Hope College,Southwest Jiaotong University,Chengdu 610400,China)

机构地区：[1]西北师范大学物理与电子工程学院,兰州730070 [2]西南交通大学希望学院,成都610400

出　　处：《强激光与粒子束》2024年第1期123-129,共7页High Power Laser and Particle Beams

基　　金：国家自然科学基金项目(12305276、11865014、11765017、11764039);甘肃省自然科学基金项目(22JR5RA174);甘肃省高等学校创新能力提升项目(2022A-011);西北师范大学科技创新项目(NWNU-LKQN2022-05)。

摘　　要：研究了相对论电磁波在热等离子体中传播时的色散特性以及由于非线性电子声波激发引起的电子声波的非线性频移。基于相对论激光在热等离子体中传播的电磁流体物理模型,采用流体的非线性频移理论,利用微扰法得到了描述相对论激光与热等离子体相互作用时谐波产生的非线性频移方程。结果表明,等离子体密度、电子温度和一阶谐波振幅是决定相对论热等离子体中非线性频移的主要因素。在弱激发下,非线性频移随着电子温度和一阶谐波振幅的增大而增大,等离子体密度抑制非线性频移。电子声波非线性频移对等离子体密度和电子温度的依赖表现出了强烈的非线性特征。研究结果为深入理解高能量激光与热等离子体相互作用中谐波的产生及引起的非线性频移提供了理论依据。Based on the electromagnetic fluid model,the effects of electron temperature and plasma density onthe nonlinear frequency shift of electron acoustic wave in a relativistic hot plasma are investigated.The nonlinearfrequency shift equation of electron acoustic wave is obtained by using the nonlinear frequency shift theory andperturbation method.The results show that the plasma density,the first harmonic amplitude and the electrontemperature are the main factors that determine the nonlinear frequency shift of electron acoustic wave in relativistichot plasma.For weak excitation,the nonlinear frequency shift increases with the increase of electron temperature andthe first harmonic amplitude,and the plasma density inhibits the nonlinear frequency shift.The impact of electrontemperature and the plasma density on nonlinear frequency shift shows a strong nonlinear character.The resultsprovide a theoretical evidence for understanding the high power laser-plasma interaction and the generation ofharmonics.

关 键 词：电磁脉冲 热等离子体 电子声波 非线性频移 

分 类 号：O539[理学—等离子体物理]