Abstract
Particle-in-cell simulation is carried out to investigate the cooling process of a multicharged dense plasma produced by optical-field-induced ionization. All coulomb collisions among charged particles are taken into consideration using Nanbu's theory of coulomb collisions and its recent extension to the case when the weight assigned to a simulated particle varies from particle to particle. The effect of coulomb collisions on the expanding plasma is very large. Two cases are considered: expansion of a source plasma 1) into a vacuum and 2) into an ambient cold plasma. The results obtained for the first case agree well with the self-similar hydrodynamic solution. In the second case, the rapid cooling of the multicharged plasma, which is essential for x-ray lasing, is accomplished. The mechanism of this cooling is clarified by the simulation. It is also shown that the expansion is accompanied by a dense wave front. Near the wave front, a double layer of electric charge is formed.
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