Research Of Prepulse Effect And Radiation From Laser Driven Ion Acceleration

With the rapid progress of ultra-short ultra-intense pulse laser technology and the expansion of its application, the study of laser plasma interaction has inspired researchers' widespread interest. The Interaction between laser and solid target contains abundant physical processes, including laser energy deposition, the generation and transport of fast electron, ion acceleration and production of various kinds of radiation caused by these fast electrons. In this paper, the main work is as follows:Firstly, the radiation hydrodynamic code is used to the study the influence of the prepulse on the target normal shell acceleration. The effect of shock waves and radiation on the target rear surface are studied from the simulation results. The reason why the optimum thickness for ion acceleration dependent on the giving prepulse condition is explained, which shows good agreement with the experimental results.Secondly, the low frequency radiation from the laser driven solid target ion acceleration is studied using the particle in cell simulation. Two different features of the radiation was observed with the incident angle of the laser pulse changing. When the laser pulse is normally incident on the surface of a solid target, the radiation field distribution and the angular distribution show good agreement with the characteristics of the transition radiation. With the laser incident angle increasing, transit radiation characteristics is disappear and a new radiation mechanism like antenna is dominated.Finally, a new mechanism by using laser driven wire target is proposed to produce the terahertz radiation. The expressions of the radiation field are derived and the space radiation field and frequency spectrum are obtained for given current source. The radiation field distribution presented from this model is consistent with the patterns observed in PIC simulations for the case of large incidence angle.