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Spherical Rayleigh–Taylor growth of three-dimensional broadband perturbations on OMEGA

Phys. Plasmas 16, 112701 (2009); doi:10.1063/1.3253321

Published 2 November 2009

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V. A. Smalyuk, S. X. Hu, J. D. Hager, J. A. Delettrez, D. D. Meyerhofer, T. C. Sangster, and D. Shvarts
Laboratory for Laser Energetics, University of Rochester, 250 East River Road, Rochester, New York 14623, USA
Spherical Rayleigh–Taylor (RT) growth experiments of three-dimensional (3D) broadband nonuniformities were conducted in the acceleration phase of spherical implosions on OMEGA [T. R. Boehly et al., Opt. Commun. 133, 495 (1997)]. The targets consisted of 20- and 24-µm-thick plastic spherical shells having diagnostic openings for backlighter x rays to image shell modulations. Experiments were conducted with square laser pulses at a low drive intensity of ~2×1014  W/cm2, high drive intensity of ~1×1015  W/cm2, and a shaped pulse consisting of a low-intensity foot and high-intensity drive part (peak intensity of ~1×1015  W/cm2). In low-intensity experiments, large RT growth was measured, resulting in shells being broken up by 3D modulations at the end of the drive. In the high-intensity experiments, no RT growth of the 3D modulations was detected. In the shaped-pulse experiments, perturbations grew during the low-intensity part of the drive and were stabilized later during the high-intensity part of the drive. The measured RT growth stabilization with the high-intensity drive was similar to previous observations in planar geometry [V. A. Smalyuk et al., Phys. Rev. Lett. 101, 025002 (2008)]. ©2009 American Institute of Physics
History: Received 20 August 2009; accepted 30 September 2009; published 2 November 2009
Permalink: http://link.aip.org/link/?PHPAEN/16/112701/1
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KEYWORDS and PACS

Keywords
PACS
  • 52.70.-m
    Plasma diagnostic techniques and instrumentation
  • 52.57.Fg
    Implosion symmetry and hydrodynamic instability for laser ICF
  • 52.50.Jm
    Plasma production and heating by laser beams
  • YEAR: 2009

PUBLICATION DATA

ISSN:
1070-664X (print)   1089-7674 (online)
Publisher:
AIP is a member of CrossRef AIP

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