| 1 | Generation mechanism of 100 MG magnetic fields in the interaction of ultra-intense laser pulse with nanostructured target显示文摘Experimental and simulation data[Moreau et al.,Plasma Phys.Control.Fusion 62,014013(2019);Kaymak et al.,Phys.Rev.Lett.117,035004(2016)]indicate that self-generated magnetic fields play an important role in enhancing the flux and energy of relativistic electrons accelerated by ultra-intense laser pulse irradiation with nanostructured arrays.A fully relativistic analytical model for the generation of the magnetic field based on electron magneto-hydrodynamic description is presented here.The analytical model shows that this self-generated magnetic field originates in the nonparallel density gradient and fast electron current at the interfaces of a nanolayered target.A general formula for the self-generated magnetic field is found,which closely agrees with the simulation scaling over the relevant intensity range.The result is beneficial to the experimental designs for the interaction of the laser pulse with the nanostructured arrays to improve laser-to-electron energy coupling and the quality of forward hot electrons. | J.M.Tian H.B.Cai W.S.Zhang E.H.Zhang B.Du S.P.Zhu | 2020 | High Power Laser Science and Engineering2020，8，2： | 1 |
| 2 | Effect of ablation on the nonlinear spike growth for the single-mode ablative Rayleigh-Taylor instability显示文摘The effect of ablation on the nonlinear spike growth of single-mode ablative Rayleigh–Taylor instability(RTI)is studied by two-dimensional numerical simulations.It is shown that the ablation can reduce the quasi-constant velocity and significantly suppress the reacceleration of the spike in the nonlinear phase.It is also shown that the spike growth can affect the ablation-generated vorticity inside the bubble,which further affects the nonlinear bubble acceleration.The vorticity evolution is found to be correlated with the mixing width(i.e.,the sum of the bubble and spike growths)for a given wave number and ablation velocity.By considering the effects of mass ablation and vorticity,an analytical model for the nonlinear bubble and spike growth of single-mode ablative RTI is developed in this study.It is found that the nonlinear growth of the mixing width,induced by the single mode,is dominated by the bubble growth for small-scale ablative RTI,whereas it is dominated by the spike growth for classical RTI. | J.Y.Fu H.S.Zhang H.B.Cai P.L.Yao S.P.Zhu | 2023 | Matter and Radiation at Extremes2023，8，1： | 0 |
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