عنوان مقاله [English]
High energy charged particles acceleration is one of the most important applications of high-power lasers interaction with plasma. By using near critical density targets, because of better laser-plasma coupling, the transferred energy from the laser to plasma will be increased. Today, because of foam targets production, with densities near to near critical density, it is possible to use such targets in order to study more about the acceleration process of particles in densities near to critical density. In this paper, using particle in cell simulation, a realistic form of foam structure for careful studying of laser interaction with targets have been studied. The optimum conditions for porous foam’s holes’ radius and the distance between holes’ centers are proposed by considering accelerated protons’ maximum energy after finishing laser duration and it is found out that for a foam with a density of 3.6 critical density and 16 micrometer length, existence of holes with 0.5 micrometer radius and 1.5 micrometers for the distance between the centers can produce protons with 40 MeV energy but if the holes were not in proper conditions, protons’ maximum energy will be decreased about 20 percent relative to without porous foam.