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Title: Observations of strong ion-ion correlations in dense plasmas

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 ∼3× solid density is probed with high-energy photons at 17.9 keV created by molybdenum He-α emission in a laser-driven plasma source. The measured elastic scattering feature shows a well-pronounced correlation peak at a wave vector of k=4Å{sup −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.
Authors:
; ; ; ; ;  [1] ; ; ; ; ; ;  [2] ;  [3] ;  [4] ;  [5] ;  [1] ;  [6] ;  [7] ; ;  [8] more »;  [9] ;  [10] ; « less
  1. Lawrence Livermore National Laboratory, Livermore, California 94550 (United States)
  2. SLAC National Accelerator Laboratory, Menlo Park, California 94025 (United States)
  3. Plasma Physics Group, AWE plc, Reading RG7 4PR (United Kingdom)
  4. (United Kingdom)
  5. Physics Department, University of California, Berkeley, California 94720 (United States)
  6. (United States)
  7. Centre for Fusion, Space and Astrophysics, Department of Physics, University of Warwick, Coventry CV4 7AL (United Kingdom)
  8. University of Oxford, Clarendon Laboratory, Oxford OX1 3PU (United Kingdom)
  9. Extreme Matter Institute, GSI Helmholtzzentrum für Schwerionenforschung, Planckstr. 1, 64291 Darmstadt (Germany)
  10. Max Planck Institut für Physik komplexer Systeme, Nötthnizer Straße 38, 01187 Dresden (Germany)
Publication Date:
OSTI Identifier:
22253057
Resource Type:
Journal Article
Resource Relation:
Journal Name: Physics of Plasmas; Journal Volume: 21; Journal Issue: 5; Other Information: (c) 2014 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
70 PLASMA PHYSICS AND FUSION TECHNOLOGY; ALUMINIUM; CORRELATIONS; COULOMB FIELD; DENSITY; ELASTIC SCATTERING; MOLYBDENUM; PEAKS; PLASMA; PLASMA DIAGNOSTICS; THERMONUCLEAR REACTOR WALLS; X-RAY DIFFRACTION