ABSTRACT
The fast ions carry out a significant fraction of the absorbed energy and decrease the energy conversion efficiency in the coronal-core plasma coupling in the laser pellet implosion. When electron plasma waves are strongly excited by the collective laser plasma coupling processes – resonance mode conversion, stimulated Raman scattering, two-plasmon decay, and so on – electrons are heated and accelerated by collisionless processes, namely, the plasma wave–electron resonant interaction. In laser produced plasmas, the laser light is absorbed near the critical density surface by the inverse-bremsstrahlung process, and some other collective processes. The absorbed energy is then transported to the high density region by electron thermal conduction. In the laser produced plasmas, the validity condition for classical diffusion model can easily breakdown. When an intense laser light is irradiated on medium or high-Z materials, significant amount of the absorbed energy is converted into soft x-ray radiation.
