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

Abstract

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=4k=4Å-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:
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Publication Date:
Research Org.:
Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
Sponsoring Org.:
USDOE
OSTI Identifier:
1366896
Report Number(s):
LLNL-JRNL-648132
Journal ID: ISSN 1070-664X
DOE Contract Number:  
AC52-07NA27344
Resource Type:
Journal Article
Journal Name:
Physics of Plasmas
Additional Journal Information:
Journal Volume: 21; Journal Issue: 5; Journal ID: ISSN 1070-664X
Publisher:
American Institute of Physics (AIP)
Country of Publication:
United States
Language:
English
Subject:
42 ENGINEERING; 70 PLASMA PHYSICS AND FUSION

Citation Formats

Ma, T., Fletcher, L., Pak, A., Chapman, D. A., Falcone, R. W., Fortmann, C., Galtier, E., Gericke, D. O., Gregori, G., Hastings, J., Landen, O. L., Le Pape, S., Lee, H. J., Nagler, B., Neumayer, P., Turnbull, D., Vorberger, J., White, T. G., Wünsch, K., Zastrau, U., Glenzer, S. H., and Döppner, T. Observations of strong ion-ion correlations in dense plasmas. United States: N. p., 2014. Web. doi:10.1063/1.4872161.
Ma, T., Fletcher, L., Pak, A., Chapman, D. A., Falcone, R. W., Fortmann, C., Galtier, E., Gericke, D. O., Gregori, G., Hastings, J., Landen, O. L., Le Pape, S., Lee, H. J., Nagler, B., Neumayer, P., Turnbull, D., Vorberger, J., White, T. G., Wünsch, K., Zastrau, U., Glenzer, S. H., & Döppner, T. Observations of strong ion-ion correlations in dense plasmas. United States. doi:10.1063/1.4872161.
Ma, T., Fletcher, L., Pak, A., Chapman, D. A., Falcone, R. W., Fortmann, C., Galtier, E., Gericke, D. O., Gregori, G., Hastings, J., Landen, O. L., Le Pape, S., Lee, H. J., Nagler, B., Neumayer, P., Turnbull, D., Vorberger, J., White, T. G., Wünsch, K., Zastrau, U., Glenzer, S. H., and Döppner, T. Thu . "Observations of strong ion-ion correlations in dense plasmas". United States. doi:10.1063/1.4872161. https://www.osti.gov/servlets/purl/1366896.
@article{osti_1366896,
title = {Observations of strong ion-ion correlations in dense plasmas},
author = {Ma, T. and Fletcher, L. and Pak, A. and Chapman, D. A. and Falcone, R. W. and Fortmann, C. and Galtier, E. and Gericke, D. O. and Gregori, G. and Hastings, J. and Landen, O. L. and Le Pape, S. and Lee, H. J. and Nagler, B. and Neumayer, P. and Turnbull, D. and Vorberger, J. and White, T. G. and Wünsch, K. and Zastrau, U. and Glenzer, S. H. and Döppner, T.},
abstractNote = {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=4k=4Å-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.},
doi = {10.1063/1.4872161},
journal = {Physics of Plasmas},
issn = {1070-664X},
number = 5,
volume = 21,
place = {United States},
year = {2014},
month = {5}
}

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