Two Dimensional Simulations of Plastic-Shell, Direct-Drive Implosions on OMEGA

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Multidimensional hydrodynamic properties of high-adiabat direct-drive plastic-shell implosions on the OMEGA laser system [T. R. Boehly et al., Opt. Commun. 133, 495 (1997)] are investigated using the multidimensional hydrodynamic code, DRACO. Multimode simulations including the effects of nonuniform illumination and target roughness indicate that shell stability during the acceleration phase plays a critical role in determining target performance. For thick shells that remain integral during the acceleration phase, target yields are significantly reduced by the combination of the long-wavelength ({ell} < 10) modes due to surface roughness and beam imbalance and the intermediate modes (20 {le} {ell} {le} 50) due ... continued below

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Radha, P B; Goncharov, V N; Collins, T B; Delettrez, J A; Elbaz, Y; Glebov, V Y et al. September 27, 2004.

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Multidimensional hydrodynamic properties of high-adiabat direct-drive plastic-shell implosions on the OMEGA laser system [T. R. Boehly et al., Opt. Commun. 133, 495 (1997)] are investigated using the multidimensional hydrodynamic code, DRACO. Multimode simulations including the effects of nonuniform illumination and target roughness indicate that shell stability during the acceleration phase plays a critical role in determining target performance. For thick shells that remain integral during the acceleration phase, target yields are significantly reduced by the combination of the long-wavelength ({ell} < 10) modes due to surface roughness and beam imbalance and the intermediate modes (20 {le} {ell} {le} 50) due to single-beam nonuniformities. The neutron-production rate for these thick shells truncates relative to one-dimensional (1-D) predictions. The yield degradation in the thin shells is mainly due to shell breakup at short wavelengths ({lambda} {approx} {Delta}, where {Delta} is the in-flight shell thickness). The neutron-rate curves for the thinner shells have significantly lower amplitudes and a fall-off that is less steep than 1-D rates. DRACO simulation results are consistent with experimental observations.

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PDF-file: 67 pages; size: 0.5 Mbytes

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  • Journal Name: Physics of Plasmas, vol. 12, N/A, February 10, 2005, pp. 032702; Journal Volume: 12

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  • Report No.: UCRL-JRNL-206954
  • Grant Number: W-7405-ENG-48
  • Office of Scientific & Technical Information Report Number: 936449
  • Archival Resource Key: ark:/67531/metadc897252

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  • September 27, 2004

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  • Sept. 27, 2016, 1:39 a.m.

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  • Dec. 2, 2016, 4:22 p.m.

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Radha, P B; Goncharov, V N; Collins, T B; Delettrez, J A; Elbaz, Y; Glebov, V Y et al. Two Dimensional Simulations of Plastic-Shell, Direct-Drive Implosions on OMEGA, article, September 27, 2004; Livermore, California. (digital.library.unt.edu/ark:/67531/metadc897252/: accessed July 16, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.