The double-cone ignition scheme is a promising novel ignition method,which is expected to greatly save the driver energy and enhance the robustness of the implosion process.In this paper,ablation of the inner surface ...The double-cone ignition scheme is a promising novel ignition method,which is expected to greatly save the driver energy and enhance the robustness of the implosion process.In this paper,ablation of the inner surface of the cone by the hard X-ray from coronal Au plasma is studied via radiation hydrodynamics simulations.It is found that the X-ray ablation of the inner wall will form strong pre-plasma,which will significantly affect the implosion process and cause the Au plasma to mix with the fuel,leading to ignition failure.The radiation and pre-ablation intensities in the system are estimated,and the evolutions of areal density,ion temperature and the distribution of Au ions are analysed.In addition,the mixing of Au in CH at collision is quantified.Then,a scheme to reduce the X-ray pre-ablation by replacing the gold cone with a tungsten cone is proposed,showing that it is effective in reducing high-Z mixing and improving collision results.展开更多
An experiment of a 500-fs KrF laser pulse incident upon a high density supersonic O2 gas jet synchronously with an ns frequency-doubled Nd：YAG laser pulse is performed in orthogonal configuration. Significant atomic ...An experiment of a 500-fs KrF laser pulse incident upon a high density supersonic O2 gas jet synchronously with an ns frequency-doubled Nd：YAG laser pulse is performed in orthogonal configuration. Significant atomic emission enhancement of over forty-fold is observed with an optical multi-channel analyser. The enhancement effect is probably attributed to the different ionization mechanisms between fs and ns laser pulses.展开更多
基金supported by the Strategic Priority Research Program of the Chinese Academy of Sciences(Grant Nos.XDA25050200 and XDA25010100)the National Natural Science Foundation of China(Grant Nos.12175309,12475252,12275356 and 12075317)the Defense Industrial Technology Development Program(Grant No.CKYS2023212807).
文摘The double-cone ignition scheme is a promising novel ignition method,which is expected to greatly save the driver energy and enhance the robustness of the implosion process.In this paper,ablation of the inner surface of the cone by the hard X-ray from coronal Au plasma is studied via radiation hydrodynamics simulations.It is found that the X-ray ablation of the inner wall will form strong pre-plasma,which will significantly affect the implosion process and cause the Au plasma to mix with the fuel,leading to ignition failure.The radiation and pre-ablation intensities in the system are estimated,and the evolutions of areal density,ion temperature and the distribution of Au ions are analysed.In addition,the mixing of Au in CH at collision is quantified.Then,a scheme to reduce the X-ray pre-ablation by replacing the gold cone with a tungsten cone is proposed,showing that it is effective in reducing high-Z mixing and improving collision results.
基金Supported by the National Natural Science Foundation of China under Grant No 10474081.
文摘An experiment of a 500-fs KrF laser pulse incident upon a high density supersonic O2 gas jet synchronously with an ns frequency-doubled Nd：YAG laser pulse is performed in orthogonal configuration. Significant atomic emission enhancement of over forty-fold is observed with an optical multi-channel analyser. The enhancement effect is probably attributed to the different ionization mechanisms between fs and ns laser pulses.
