Measurements of the conduction-zone length and mass ablation rate in cryogenic direct-drive implosions on OMEGA

Journal Article · Tue Apr 14 00:00:00 EDT 2015 · Physical Review Letters

DOI:https://doi.org/10.1103/PhysRevLett.114.155002· OSTI ID:1178087

Michel, D. T. ^[1]; Davis, A. K. ^[1]; Goncharov, V. N. ^[1]; Sangster, T. C. ^[1]; Hu, S. X. ^[1]; Igumenshchev, I. V. ^[1]; Meyerhofer, D. D. ^[1]; Seka, W. ^[1]; Froula, D. H. ^[1]

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1. Univ. of Rochester, Rochester, NY (United States). Lab. for Laser Energetics.

Measurements of the conduction-zone length (110 ± 20 μm at t = 2.8 ns), the averaged mass ablation rate of the deuterated plastic (7.95 ± 0.3 μg/ns), shell trajectory, and laser absorption are made in direct-drive cryogenic implosions and are used to quantify the electron thermal transport through the conduction zone. Hydrodynamic simulations that use nonlocal thermal transport and cross-beam energy transfer models reproduce these experimental observables. Hydrodynamic simulations that use a time-dependent flux-limited model reproduce the measured shell trajectory and the laser absorption but underestimate the mass ablation rate by ~10% and the length of the conduction zone by nearly a factor of 2.

• Research Organization: Univ. of Rochester, Rochester, NY (United States). Lab. for Laser Energetics.
• Sponsoring Organization: USDOE National Nuclear Security Administration (NNSA)
• DOE Contract Number: NA0001944
• OSTI ID: 1178087
• Journal Information: Physical Review Letters, Vol. 114, Issue 15; ISSN 0031-9007
• Publisher: American Physical Society (APS)
• Country of Publication: United States
• Language: English

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