Investigation on non-LTE radiation emitted from a laser-irradiated Au disk  

作　　者：GU Peijun PEI Wenbing FENG Tinggui WU Changshu 

机构地区：[1]Institute of Applied Physics and Computational Mathematics, P. O. Box 8009, Beijing 100088, China Institute of Applied Physics and Computational Mathematics, P. O. Box 8009, Beijing 100088, China Institute of Applied Physics and Computational Mathematics, P. O. Box 8009, Beijing 100088, China Institute of Applied Physics and Computational Mathematics, P. O. Box 8009, Beijing 100088, China

出　　处：《Science China(Physics,Mechanics & Astronomy)》2005年第3期345-360,共16页中国科学：物理学、力学、天文学（英文版）

基　　金：supported by the Hi-Tech ICF commited in China

摘　　要：The spectral character of X-ray emitted from laser-irradiated gold disk is studied by using the one-dimensional non-LTE multigroup radiation transport hydrodynamics code RDMG. The applicability of the “three-temperature” model in which the radiation is described with thermal conduction approximation is checked. The simulation results show that the X-ray emitted from the laser-produced gold plasma is in non-LTE, and that the atom model has significant effect on the structure of X-ray spectrum. However, the plasma states, laser absorption efficiency and X-ray conversion efficiency, which are calculated with the “three-temperature” model, are almost the same as those with non-LTE multigroup radiation transport model. This fact indicates that the “three-temperature” model can be used to study plasma states and the energy distributions produced by a laser-irradiated high-Z target. This is meaningful to the 2-D or 3-D simulation.The spectral character of X-ray emitted from laser-irradiated gold disk is studied by using the one-dimensional non-LTE multigroup radiation transport hydrodynamics code RDMG. The applicability of the “three-temperature” model in which the radiation is described with thermal conduction approximation is checked. The simulation results show that the X-ray emitted from the laser-produced gold plasma is in non-LTE, and that the atom model has significant effect on the structure of X-ray spectrum. However, the plasma states, laser absorption efficiency and X-ray conversion efficiency, which are calculated with the “three-temperature” model, are almost the same as those with non-LTE multigroup radiation transport model. This fact indicates that the “three-temperature” model can be used to study plasma states and the energy distributions produced by a laser-irradiated high-Z target. This is meaningful to the 2-D or 3-D simulation.

关 键 词：laser-irradiated Au target  the state of plasma  X-ray  NON-LTE radiation  ATOM model. 

分 类 号：N[自然科学总论]