K_(alpha) Radiation of Foil under Interaction with Laser Pulse of Relativistic Intensity

摘要

An analytical model of K_(alpha) radiation of thin laser targets has been developed. It has been shown that, for such targets, the motion of fast electrons is significant not only in the target itself but also in vacuum. The considered dependences for the free path length of a fast electron and for the absorption coefficient of laser radiation on the laser intensity with allowance for the electron motion in vacuum make it possible to match the results of the proposed model with the experimental data on generation of K_(alpha) radiation in wide ranges of laser intensities (10~(18)-10~(21) W/cm~(2)) and thicknesses (1-100 (mu)m) of targets.