Z箍缩Al等离子体负载1维辐射磁流体性能模拟

1-D Simulation of Radiative Magneto-HydrodynamicsProperties of Z-pinch Al Plasma Loading

针对Al丝阵负载进行Z箍缩内爆模拟,计算Al等离子体负载Z箍缩内爆时间、流体速度及滞止阶段K壳层X射线辐射功率等参数,分析Al等离子体Z箍缩动力学及K壳层辐射相关性能。对初始半径r为6 mm,线质量分别为68,102,136,204μg·cm-1的Al等离子体进行1维Z箍缩内爆模拟。模拟结果表明:Al等离子体壳层在最终压缩比为0.1时,Z箍缩内爆时间随线质量增大而增大,等离子体壳层平均流体速度和平均离子温度随线质量增大而减小,流体速度达105m·s-1量级,平均电子数密度达1020cm-3量级以上。依据Z箍缩动力学模拟获得的温度、密度及速度等参数进行X射线能谱计算,Al等离子体K壳层X射线辐射功率随线质量变化趋势与实验结果符合较好。在4种线质量中,102μg·cm-1Al等离子体K壳层X射线辐射功率最大,为64.54 GW,该线质量Al等离子体壳层在Z箍缩最终压缩比时所产生的Ly-α谱线强度最大,为1.5 GW·eV-1,且1 500~2 300 eV能段范围K壳层X射线辐射能段中Ly-α谱线和He-α谱线的占比为32.3%。线质量为102μg·cm-1时,Al等离子体的线辐射功率和连续辐射功率均有提升。

This article simulates the Z-pinch implosion of Al wire array loads,calculates the Z-pinch implosion time,fluid velocity,and K-shell X-ray radiation power during the stagnation stage of Al plasma loads,and analyzes the Z-pinch dynamics of Al plasma and the related properties of K-shell radiation.The one-dimensional Z-pinch implosion simulation is carried out for Al plasma with initial radius r of 6 mm and line mass of 68,102,136,and 204μg·cm-1,respectively.The simulation results show that when the final compression ratio of the Al plasma shell is 0.1,the Z-pinch implosion time increases with the increase of line mass,and the average fluid velocity and average ion temperature of the plasma shell decrease with the increase of line mass.The order of fluid velocity is 105 m·s-1,and the order of average electron density is above 1020 cm-3.Based on the temperature,density,velocity,etc.obtained from the simulation of Z-pinch dynamics,X-ray energy spectrum calculations are conducted.The trend of X-ray radiation power of Al plasma K-shell layer with line mass changes is in good agreement with experimental results.Among the four line masses,the mass of 102μg·cm-1 Al plasma K-shell X-ray radiation power is the highest(64.54 GW).The Ly-αline intensity generated by the Z-pinch final compression ratio of 102μg·cm-1 Al plasma shell is 1.5 GW·eV-1,The smallest ratio of Al plasma Ly-αand He-αspectral line power to K-shell X-ray radiation power can reach 32.3%.When the line mass is 102μg·cm-1,the line radiation power and continuous radiation power of the Al plasma are both improved.