扭曲有质动力驱动产生扭曲的等离子体波  

Twisted plasma waves driven by twisted ponderomotive force

作　　者：时银 David R Blackman Robert J Kingham Alexey Arefiev Yin Shi;David R Blackman;Robert J Kingham;Alexey Arefiev(Department of Plasma Physics and Fusion Engineering,University of Science and Technology of China,Hefei 230026,China;Department of Mechanical and Aerospace Engineering,University of California at San Diego,CA 92093,USA;Blackett Laboratory,Imperial College London,London SW72AZ,UK)

机构地区：[1]中国科学技术大学等离子体物理与聚变工程系,安徽合肥230026 [2]加州大学圣迭戈分校机械航空工程系,圣迭戈920093,美国 [3]帝国理工学院Blackett实验室,英国伦敦SW72AZ

出　　处：《中国科学技术大学学报》2023年第1期25-31,I0008,共8页JUSTC

基　　金：supported by USTC Research Funds of the Double First-Class Initiative (YD2140002003);Strategic Priority Research Program of CAS (XDA25010200);CAS Project for Young Scientists in Basic Research (YSBR060);Newton International Fellows Alumni follow-on funding。

摘　　要：利用扭曲的有质动力,我们给出了驱动产生的扭曲等离子体波。其中我们利用了两束同向传播的拉盖尔-高斯(LG)光,他们分别携带不同的频率和扭曲指数,结果可以得到扭曲的有质动力。LG光一般被认为携带轨道角动量。三维的网格粒子模拟(PIC)模拟被用来证实激光驱动产生扭曲等离子体波。这种扭曲的等离子体波拥有螺旋旋转的电子密度扰动结构。不同于线性流体理论的预测,模拟结果显示一个非线性的旋转电流和静态的轴向磁场。伴随旋转电流的是扭曲等离子体波中携带轨道角动量的粒子。该文中,我们也给出了详细的扭曲等离子体波的理论分析结果。We present the results of twisted plasma waves driven by twisted ponderomotive force.With the beating of two,co-propagating,Laguerre-Gaussian(LG)orbital angular momentum(OAM)laser pulses with different frequencies and also different twist indices,we can obtain the twisted ponderomotive force.Three-dimensional particle-in-cell simulations are used to demonstrate the twisted plasma waves driven by lasers.The twisted plasma waves have an electron density perturbation with a helical rotating structure.Different from the predictions of the linear fluid theory,the simulation results show a nonlinear rotating current and a static axial magnetic field.Along with the rotating current is the axial OAM carried by particles in the twisted plasma waves.A detailed theoretical analysis of twisted plasma waves is also given.

关 键 词：有质动力 拉盖尔-高斯 轨道角动量 等离子体波 自生磁场 

分 类 号：O534.1[理学—等离子体物理]