| Energetic ion beam driven by ultra-intense laser is of significance in inertial confinement fusion,warm dense plasmas and cancer treatment.Many interesting and physical phenomena will occur in the interaction.Combining the PIC code and MC method,we have studied the stopping of intense ion beam driven by ultra-intense laser and generation of fusion neutrons in solid targets.The main research contents are as follows:Firstly,the generation and stopping of a laser-driven two-component ion beam are investigated by three-dimensional PIC simulation and an extended stopping model.It is found that a two-component ion beam with the tunable composition ratio can be obtained from the two-species-ions sandwich target interacting with a relativistic laser pulse.When the generated proton beam mixed with a certain portion of carbon ions transports in fully ionized dense plasma,the beam stopping power is significantly enhanced compared to a pure proton beam.A simple theoretical model is established to investigate the effect of heavy ion mixing on proton beam driven fast ignition.Secondly,combining full 3D PIC and MC simulation,we propose a scheme to obtain high yield neutron source by 7Li（d,n）beam reaction using a 100-femtosecond relativistic laser irradiating a CD target attached with a metal wire array microstructure.The results show that with a laser of intensity 1.37×1020W/cm2,duration 333 fs and energy 6.7 J,a neutron pulse yield with as high as 109 and 20 ps duration can be obtained. |
