Observations of strong ion-ion correlations in dense plasmas

被引：17

作者：

Ma, T. ^{[1
]}

Fletcher, L. ^{[2
]}

Pak, A. ^{[1
]}

Chapman, D. A. ^{[3
,4
]}

Falcone, R. W. ^{[5
]}

Fortmann, C. ^{[1
,6
]}

Galtier, E. ^{[2
]}

Gericke, D. O. ^{[4
]}

Gregori, G. ^{[7
]}

Hastings, J. ^{[2
]}

Landen, O. L. ^{[1
]}

Le Pape, S. ^{[1
]}

Lee, H. J. ^{[2
]}

Nagler, B. ^{[2
]}

Neumayer, P. ^{[8
]}

Turnbull, D. ^{[1
]}

Vorberger, J. ^{[9
]}

White, T. G. ^{[7
]}

Wuensch, K. ^{[10
]}

Zastrau, U. ^{[2
,11
]}

Glenzer, S. H. ^{[2
]}

Doeppner, T. ^{[1
]}

机构：

[1] Lawrence Livermore Natl Lab, Livermore, CA 94550 USA

[2] SLAC Natl Accelerator Lab, Menlo Pk, CA 94025 USA

[3] AWE Plc, Plasma Phys Grp, Reading RG7 4PR, Berks, England

[4] Univ Warwick, Dept Phys, Ctr Fus Space & Astrophys, Coventry CV4 7AL, W Midlands, England

[5] Univ Calif Berkeley, Dept Phys, Berkeley, CA 94720 USA

[6] Univ Calif Los Angeles, Dept Phys & Astron, Los Angeles, CA 90095 USA

[7] Univ Oxford, Clarendon Lab, Oxford OX1 3PU, England

[8] GSI Helmholtzzentrum Schwerionenforsch, Extreme Matter Inst, D-64291 Darmstadt, Germany

[9] Max Planck Inst Phys Komplexer Syst, D-01187 Dresden, Germany

[10] Tessella, Abington OX14 3YS, England

[11] Univ Jena, Inst Opt & Quantum Elect, D-07743 Jena, Germany

来源：

PHYSICS OF PLASMAS | 2014年 / 21卷 / 05期

基金：

英国工程与自然科学研究理事会;

关键词：

Aluminum - Electric fields - X ray scattering;

D O I：

10.1063/1.4872161

中图分类号：

O35 [流体力学]; O53 [等离子体物理学];

学科分类号：

070204 ; 080103 ; 080704 ;

摘要：

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.

引用

页数：7

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