Electromagnetic Instability And Self-generated Magnetic Field In Ultra-strong Laser Plasma Interaction

In recent years,with the continuous development of Ultra short Super Pulse Chirped Amplification Technology(CPA),the ultra short laser pulse width is from the picosecond(ps,10-12s)to the femtosecond(fs,10-15s).And the pulse peak power density has reached 1022 W / cm2 or more.When such a powerful ultrashort laser pulse is irradiated to a solid plasma thin target,not only the high-energy electron flow near the speed of light is generated in the solid plasma thin target,but also leads the self-generating magnetic field of the Tesla magnitude and other rich nonlinearities phenomenon.The research and development of these physical processes make it possible to produce new radiation sources and laser confinement nuclear fusion by the interaction of super-pulsed lasers with solid plasma thin targets,as well as in medical,laser spectroscopy,super-laser physics,high-capacity and high-speed optical communications aspects show a broad and important role.And also promote the development of some cutting-edge disciplines in the femtosecond laser precision machining,laser particle acceleration and other research areas.However,the factors such as the self-generated magnetic field and various instabilities have an impact in the interaction between the super-pulsed laser and the solid plasma target have been studied in the rapid development of the ?inertial confinement fusion? and the laser-driven new particle accelerator field formed a significant constraint.In order to solve this problem,the paper studies the self-generated magnetic field,electromagnetic instability,non-linear transmission characteristics of super-pulsed laser and solid plasma thin targets by theoretical analysis and numerical simulation.This paper introduces the theoretical basis of the interaction between laser and plasma.From the classical plasma Vlasov-Maxwell theory,the electromagnetic instability and the self-generated magnetic field and dispersion relation in the magnetically free anisotropic plasma are solved.The use of flat plasma thin target,Calculated the self-generated magnetic field yB growth rate of k? data,The laser anisotropy parameters and the thermal velocity values scattered in different directions are obtained in the plasma with the critical density in different time periods.The presence of self-generated magnetic field is effectively controlled within the range of the presence of the generated magnetic field.It is closely related to the self-generated magnetic field excited by the plasma thin target.The larger the magnetic field is,the energy absorbed by the plasma is affected by the plasma The greater the loss,the more hikes of hyperthermal electronic movement.Particle simulation method(PIC)is used to solve the equations of relativistic particle motion,as well as boundary condition processing method,current density initial condition and so on.The simulation results of electromagnetic instability and self-generated magnetic field and the transport process of super-hot electrons in high-density plasma were compared with theoretical analysis and numerical simulation.