Numerical simulation of electron thermal conduction phenomena in femto second-laser plasma interaction

The spatio temporal evolution of current density, electric field and self-generated magnetic field in ultraintense laser-plasma interactions are studied by electromagnetic relativistic particle-in-cell program. The main characteristics of nonlocal electron transport are briefly described for laser-produced plasmas, which include the effects of preheating in overdense region, flux inhabitation near critical surface and anti-diffusion in coronal region. The temporal evolution electron thermal conduction with the self-generated magnetic field description of classical Spitzer-Harm theory is obtained. The numerical simulation result shows that electromagnetic instability is excited in the plasma because of the random thermal motion of electrons under irradiation of the linear polarized femtosecond laser. It is the strong magnetic field excited by instability which makes the electron beam deposit energy within very short distance. Meanwhile, it restrains the electron thermo current when the laser ponderomotive force bursts through the electrons.