Reduced PIC/MCC Simulation Of Energy Deposition Of Energetic Particles In High Density Plasma

In the process of ultrashort ultrahigh intensity laser plasma interaction,located near the critical density of particles through various absorption mechanisms will be the energy deposition into the background plasma,resulting in a large number of energetic particles with relativistic energy.Whether it is in the practical application of inertial confinement fusion or X-ray radiography,has important research value and significance of these energetic particle generation,transport and energy deposition.The simulation of interaction in ultrashort intensity laser with high density plasma under the background of laser energy absorption in near critical density of particles,when the particle energy reaches a certain value will become the energetic particles,then these energetic particles from low density plasma transport to coulomb collision process of high density plasma region and energetic particles kinetic energy transfer part of the energy into the background particles,the energy deposited in the background plasma.Meanwhile,the energetic particles beam stimulates plasma wave substantially during the transportation in plasma,the energy deposits in plasma by group effect which is also called plasma oscillation.This thesis focuses on the Reduced PIC/MCC algorithm and the numerical simulation of the interaction between the laser and the high density plasma,the main contents are as follows:1.Make summary,comparison and conclusion for the numerical simulation model of the generation,transportation and energy deposition of high-powered particle.By comparing the stopping power model,Flokker-Planck model,PIC/MCC simulation model and Reduced PIC/MCC simulation model,we can draw a conclusion that Reduced PIC/MCC simulation model can not only accurately simulate the generation,transportation and energy deposition of high-powered particle,but also reduce the computer resources sharply.2.Make deduction of The Reduced PIC/MCC algorithm,including the solution of electromagnetic field,the background current,the charge density,the motion equation,the electron temperature,and the normalization theory.The simulation flowchart and the various solving modules of the Reduced PIC/ MCC program are also introduced.3.The interaction between the laser and the high density plasma is simulated by using the Reduced PIC/MCC program.A detailed analysis of the simulation process is made for particle density,fast current and field changes with time and space in system1 and system2.Also analyze the electron temperature with the change of time and space in system2.