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Pressure-driven, resistive magnetohydrodynamic interchange instabilities in laser-produced high-energy-density plasmas

Author(s)
Li, Chikang; Frenje, Johan A.; Petrasso, Richard D.; Seguin, Fredrick Hampton; Amendt, P. A.; Landen, O. L.; Town, R. P. J.; Betti, R.; Meyerhofer, D. D.; Soures, J. M.; ... Show more Show less
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Abstract
Recent experiments using proton backlighting of laser-foil interactions provide unique opportunities for studying magnetized plasma instabilities in laser-produced high-energy-density plasmas. Time-gated proton radiograph images indicate that the outer structure of a magnetic field entrained in a hemispherical plasma bubble becomes distinctly asymmetric after the laser turns off. It is shown that this asymmetry is a consequence of pressure-driven, resistive magnetohydrodynamic (MHD) interchange instabilities. In contrast to the predictions made by ideal MHD theory, the increasing plasma resistivity after laser turn-off allows for greater low-mode destabilization (m>1) from reduced stabilization by field-line bending. For laser-generated plasmas presented herein, a mode-number cutoff for stabilization of perturbations with m>∼[8πβ(1+D[subscript m]k⊥(2)γmax(−1))](1/2) is found in the linear growth regime. The growth is measured and is found to be in reasonable agreement with model predictions.
Date issued
2009-07
URI
http://hdl.handle.net/1721.1/51754
Department
Massachusetts Institute of Technology. Plasma Science and Fusion Center
Journal
Physical Review E
Publisher
American Physical Society
Citation
Li, C. K. et al. “Pressure-driven, resistive magnetohydrodynamic interchange instabilities in laser-produced high-energy-density plasmas.” Physical Review E 80.1 (2009): 016407. © 2009 The American Physical Society.
Version: Final published version
ISSN
1550-2376
1539-3755

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