Cryogneic-Target Performance and Implosion Physics Studies on OMEGA

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Recent progress in direct-drive cryogenic implosions on the OMEGA Laser Facility [T. R. Boehly et al., Opt. Commun. 133, 495 (1997)] is reviewed. Ignition-relevant areal densities of ~200 mg/cm^2 in cryogenic D2 implosions with peak laser-drive intensities of ~5 x 10^14 W/cm^2 were previously reported [T. C. Sangster et al., Phys. Rev. Lett. 100, 185006 (2008)]. The laser intensity is increased to ~10^15 W/cm^2 to demonstrate ignition-relevant implosion velocities of 3–4 x 10^7 cm/ s, providing an understanding of the relevant target physics. Planar-target acceleration experiments show the importance of the nonlocal electron-thermal-transport effects for modeling the laser drive. Nonlocal ... continued below

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056301

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Smalyuk, V.A.; Betti, R.; Boehly, T.R.; Craxton, R.S.; Delettrez, J.A.; Edgell, D.H. et al. March 6, 2009.

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Recent progress in direct-drive cryogenic implosions on the OMEGA Laser Facility [T. R. Boehly et al., Opt. Commun. 133, 495 (1997)] is reviewed. Ignition-relevant areal densities of ~200 mg/cm^2 in cryogenic D2 implosions with peak laser-drive intensities of ~5 x 10^14 W/cm^2 were previously reported [T. C. Sangster et al., Phys. Rev. Lett. 100, 185006 (2008)]. The laser intensity is increased to ~10^15 W/cm^2 to demonstrate ignition-relevant implosion velocities of 3–4 x 10^7 cm/ s, providing an understanding of the relevant target physics. Planar-target acceleration experiments show the importance of the nonlocal electron-thermal-transport effects for modeling the laser drive. Nonlocal and hot-electron preheat is observed to stabilize the Rayleigh–Taylor growth at a peak drive intensity of ~10^15 W/cm^2. The shell preheat caused by hot electrons generated by two-plasmon-decay instability was reduced by using Si-doped ablators. The measured compressibility of planar plastic targets driven with high-compression shaped pulses agrees well with one-dimensional simulations at these intensities. Shock mistiming has contributed to compression degradation of recent cryogenic implosions driven with continuous pulses. Multiple-picket (shock-wave) target designs make it possible for a more robust tuning of the shock-wave arrival times. Cryogenic implosions driven with double-picket pulses demonstrate somewhat improved compression performance at a peak drive intensity of ~10^15 W/cm^2.

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056301

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  • Journal Name: Physics of Plasmas; Journal Volume: 16; Journal Issue: 5; Conference: 50th Annual Meeting of the APS Division of Plasma Physics, Dallas, TX, 17-21 November 2008

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  • Report No.: DOE/NA/28302-874
  • Grant Number: FC52-08NA28302
  • DOI: 10.1063/1.3078102 | External Link
  • Office of Scientific & Technical Information Report Number: 948811
  • Archival Resource Key: ark:/67531/metadc934453

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  • March 6, 2009

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  • Nov. 13, 2016, 7:26 p.m.

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  • April 10, 2018, 3:17 p.m.

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Smalyuk, V.A.; Betti, R.; Boehly, T.R.; Craxton, R.S.; Delettrez, J.A.; Edgell, D.H. et al. Cryogneic-Target Performance and Implosion Physics Studies on OMEGA, article, March 6, 2009; United States. (digital.library.unt.edu/ark:/67531/metadc934453/: accessed September 20, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.