Evolution of elastic x-ray scattering in laser-shocked warm dense lithium.
Evolution of elastic x-ray scattering in laser-shocked warm dense lithium.
复制标题
激光冲击热致密锂中弹性 X 射线散射的演变。
DOI：
10.1103/physreve.80.066406
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发表时间：
2009
期刊：
影响因子：
--
通讯作者：
Kugland NL
中科院分区：
文献类型：
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作者：
Kugland NL
我们用近弹性X射线散射研究了热致密Li的动力学。利用4 ns长的激光脉冲驱动的冲击波对锂箔进行加热和压缩。单独的1 ns长的激光脉冲被用来产生一个明亮的源的2.96 keV的氯Ly-photons的X-射线散射，和散射光子的光谱被记录在一个散射角使用高度取向的热解石墨晶体在von Hamos几何操作。加热器和背光灯激光束之间的可变延迟测量散射时间演变。与辐射流体动力学模拟的比较表明，等离子体是高度耦合在最初的几个纳秒，然后放松到一个温和的耦合状态在以后的时间。用屏蔽单组分等离子体模型成功地模拟了近弹性散射振幅。我们的主要发现是，近弹性散射振幅是相当敏感的平均电离状态和扩展的电离模型的选择在辐射流体力学模拟用于预测内的等离子体性质的冲击锂。
We have studied the dynamics of warm dense Li with near-elastic x-ray scattering. Li foils were heated and compressed using shock waves driven by 4-ns-long laser pulses. Separate 1-ns-long laser pulses were used to generate a bright source of 2.96 keV Cl Ly-photons for x-ray scattering, and the spectrum of scattered photons was recorded at a scattering angle ofusing a highly oriented pyrolytic graphite crystal operated in the von Hamos geometry. A variable delay between the heater and backlighter laser beams measured the scattering time evolution. Comparison with radiation-hydrodynamics simulations shows that the plasma is highly coupled during the first several nanoseconds, then relaxes to a moderate coupling state at later times. Near-elastic scattering amplitudes have been successfully simulated using the screened one-component plasma model. Our main finding is that the near-elastic scattering amplitudes are quite sensitive to the mean ionization stateand by extension to the choice of ionization model in the radiation-hydrodynamics simulations used to predict plasma properties within the shocked Li.
使用 PROPACEOS 和 SESAME 状态方程的 HELIOS 仿真结果比较
DOI：
--
发表时间：
2007
期刊：
影响因子：
--
作者：
J. Murray;D. McFarland;R. Waldman
通讯作者：
R. Waldman