摘要
采用考虑核运动的电子-粒子蒙特卡罗模拟法,选择合适的Al基板及蓝宝石窗口材料标准模型,计算研究了液氘的多次冲击特性。获得的液氘单次冲击Hugoniot曲线基本通过了所有动高压加载实验的误差棒,当压力为50.3 GPa时,具有最大压缩率4.48,在压力大于100 GPa的高压区内未发现压缩率有突然变大的现象。预估的二次加载及回射比与Z装置的三位一体测量结果吻合,回射比曲线在不同速度段与不同模型方法一致。当单次冲击压力为38 GPa时,回射比达最大值3.34。给出了液氘多次冲击p-u曲线和状态分布等规律,研究结果表明,经6次冲击压缩后,液氘压力达到终态压力的96%以上。
The thermodynamic properties of liquid deuterium under multi-shock compression have been calculated by using the coupled electron-ion Monte Carlo(CEIMC)method considering nuclear motion and selecting the appropriate standard model of Al substrate and sapphire window material.It is shown that the simulation data are in good agreement with the experimental and other ab-initio ones.The principal Hugoniot curve,which has a maximum compression of 4.48 at about 50.3 GPa,has passed through the error bars of various existing experiments generated via different high-pressure technologies.However,no apparent increase of the compression rate is found near 100 GPa.The re-shock and third-shock simulation results are also in excellent agreement with the existing principal Hugoniot,reverberating wave,and mechanical re-shock measurements of liquid deuterium using Z machine.The reverberation timing ratio has a maximum value of 3.34 when the first-shock pressure of liquid deuterium reaches 38 GPa.Moreover,we have investigated the change rules of states and its distribution of liquid deuterium under each shock.It is shown that the sixth-shock pressure will be higher than 96%of the final state pressure.
作者
李名锐
冯娜
周刚
范如玉
李明
钱秉文
LI Mingrui;FENG Na;ZHOU Gang;FAN Ruyu;LI Ming;QIAN Bingwen(Department of Engineering Physics,Tsinghua University,Beijing 100084,China;Northwest Institute of Nuclear Technology,Xi’an 710024 China)
出处
《现代应用物理》
2023年第1期200-209,227,共11页
Modern Applied Physics
基金
国家自然科学基金资助项目(11772269)。
关键词
多次冲击
液氘
CEIMC
状态方程
multi-shock compression
liquid deuterium
CEIMC
equation of state
