激光等离子体相互作用中的自生磁场和超热电子热输运

应用相对论电磁粒子模拟程序，研究了线性极化强激光入射到无碰撞密度均匀等离子体时被加速的超热电子及电磁不稳定性机制。讨论了电磁不稳定性激发的自生磁场和超热电子热传导特性。 用Spitzer-Harm理论分析了电子热传导中能量的运输情况，观察到由激光的非等方加热引起的电子纵向加热现象。结果表明，不稳定性激发的强电磁场使电子束在1 μm的距离内沉积能量，同时对在激光有质动力推开电子时形成的电子热流产生抑制作用。

Self-Generated Magnetic Field and Hot Electron Energy Transport in the Interaction of Ultraintense Laser Pulse with Plasmas

Stimulated hot electron and its energy transport mechanism by a linearly-polarized laser interacting with a plasma are studied by using electromagnetic relativistic particle-in cell program simulation. The onset and nonlinear saturation process of electromagnetic instability are discussed. The state of transport of energy which is in the heat exchange with electron by the Spitzer-Harm theory is analyzed, electron′s vertical pyrogenation phenomenon that resulted from anisotropic heating of laser is observed. The result of this research indicates that the strong magnetic field excited by instability makes the electron beam deposit the energy within very short distance, meanwhile, restrain the electron therymal current to form when the laser ponderomotive force burst through the electron.