| With the rapid development of laser technology,the research of generation and applications of high energy electron bunch from ultra-intense ultra-short laser pulse interacting with plasma have attracted significant interest in recent years.With the enhancement of laser intensity,quantum electrodynamics（QED）effects,such as radiation damping and electron-positron pair creation,which were rarely considered before,become more and more obvious in the physics processes.In our thesis,a scheme of high energy electron bunch in condition of QED effects and an application of such electron bunch have been studied based on particle-in-cell（PIC）simulations.The thesis structure is as followed.Firstly,a scheme is proposed to obtain high energy density electron beam via two ultra-intense laser pulses sequentially irradiating a gas target.2-dimensional PIC simulation results show that,a high density electron beam is generated around the laser axis when the first laser pulse with a peak intensity of 2×1023W/cm2 propagates in a near-critical-density（NCD）plasma.Under the laser wakefield from the first laser and the ponderomotive force from the second laser,this high density electron beam will be accelerated sufficiently with the cutoff energy about 30GeV and the energy density up to 1.2×1019Jm-3.Compared with the same energy of single laser driver,the maximum energy of the electron beam energy can be improved about three times.Secondly,an electron obtained from above case is used to accelerate protons by TNSA（target normal sheath acceleration）.Simulation results show that,when an electron bunch with the density of 1027m-3 irradiates a hydrogen target,a proton beam with the cutoff energy about hundreds MeV and divergence angle less than 30 degrees has been obtained.Results in this thesis are useful for theoretical and experimental studies of the acceleration of electrons and protons in condition of laser plasma interaction. |
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