Observations of strong ion-ion correlations in dense plasmas
Observations of strong ion-ion correlations in dense plasmas
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DOI：
10.1063/1.4872161
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发表时间：
2014-05-01
影响因子：
2.2
通讯作者：
Doeppner, T.
中科院分区：
文献类型：
--
作者：
Ma, T.;Fletcher, L.;Doeppner, T.
使用同时光谱，角度，和时间分辨的X射线散射，我们测量的强耦合等离子体中的明显的离子-离子相关峰。激光驱动的冲击压缩铝在类似的3倍固体密度探测与高能量光子在17.9 keV的钼氦-α发射在激光驱动的等离子体源。测得的弹性散射特征在k = 4埃（-1）的波矢处显示出非常明显的相关峰。这种相关峰的大小不能用采用线性屏蔽库仑势的标准等离子体理论来描述。先进的模型，包括一个强大的短程排斥，由于铝离子的内部结构，然而，在良好的协议与散射数据。这些研究已经证明了一种新的高度准确的诊断技术，直接测量压缩状态和离子-离子相关性。此后，我们应用这种新的方法在单次激发波数分辨S（k）测量，以表征致密等离子体的物理性质。(C)2014 AIP Publishing LLC.
Using simultaneous spectrally, angularly, and temporally resolved x-ray scattering, we measure the pronounced ion-ion correlation peak in a strongly coupled plasma. Laser-driven shock-compressed aluminum at similar to 3x solid density is probed with high-energy photons at 17.9 keV created by molybdenum He-alpha emission in a laser-driven plasma source. The measured elastic scattering feature shows a well-pronounced correlation peak at a wave vector of k = 4 angstrom(-1). The magnitude of this correlation peak cannot be described by standard plasma theories employing a linear screened Coulomb potential. Advanced models, including a strong short-range repulsion due to the inner structure of the aluminum ions are however in good agreement with the scattering data. These studies have demonstrated a new highly accurate diagnostic technique to directly measure the state of compression and the ion-ion correlations. We have since applied this new method in single-shot wave-number resolved S(k) measurements to characterize the physical properties of dense plasmas. (C) 2014 AIP Publishing LLC.