Mitigating laser-imprint effects in direct-drive inertial confinement fusion implosions with an above-critical-density foam layer

Hu, S. X.; Theobald, W.; Radha, P. B.; Peebles, J. L.; Regan, S. P.; Nikroo, A.; Bonino, M. J.; Harding, D. R.; Goncharov, V. N.; Petta, N.; Sangster, T. C.; Campbell, E. M.

doi:10.1063/1.5044609

Mitigating laser-imprint effects in direct-drive inertial confinement fusion implosions with an above-critical-density foam layer

Journal Article · Fri Aug 17 00:00:00 EDT 2018 · Physics of Plasmas

DOI:https://doi.org/10.1063/1.5044609· OSTI ID:1465792

^[1]; Theobald, W. ^[2]; Radha, P. B. ^[2]; Peebles, J. L. ^[2]; Regan, S. P. ^[2]; ^[3]; Bonino, M. J. ^[2]; Harding, D. R. ^[2]; Goncharov, V. N. ^[2]; Petta, N. ^[2]; ^[2]; ^[2]

Univ. of Rochester, NY (United States). Lab. for Laser Energetics; Laboratory for Laser Energetics, University of Rochester
Univ. of Rochester, NY (United States). Lab. for Laser Energetics
Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)

Low-density foams of low-/mid-Z materials have been previously proposed to mitigate laser imprint for direct-drive inertial confinement fusion (ICF). For foam densities above the critical density of the drive laser, the mechanism of laser-imprint mitigation relies on the reduced growth rate of Rayleigh–Taylor instability because of the increased ablation velocity and density scale length at the ablation surface. Experimental demonstration of this concept has been limited so far to planar-target geometry. The impact of foams on spherical implosions has not yet been explored in experiments. To examine the viability of using an above-critical-density foam layer to mitigate laser-imprint effects in direct-drive ICF implosions on OMEGA, we have performed a series of 2-D DRACO simulations with state-of-the-art physics models, including nonlocal thermal transport, cross-beam energy transfer, and first-principles equation-of-state tables. The simulation results indicate that a 40-μm-thick CH or SiO₂ foam layer with a density of p = 40 mg/cm³ added to a D2-filled polystyrene (CH) capsule can significantly improve the moderate-adiabat (α ≈ 3) implosion performance. In comparison with the standard CH target implosion, an increase of neutron yield by a factor of 4 to 8 and the recovery of 1-D compression pR are predicted by DRACO simulations for a foam-target surface roughness of σ_rms ≤ 0.5 μm. These encouraging results could readily facilitate experimental demonstrations of laser-imprint mitigation with an above-critical-density foam layer.

View Accepted Manuscript (DOE)

Research Organization:: Lawrence Livermore National Laboratory (LLNL), Livermore, CA (United States); Univ. of Rochester, NY (United States). Lab. for Laser Energetics

Sponsoring Organization:: USDOE National Nuclear Security Administration (NNSA)

Grant/Contract Number:: AC52-07NA27344; NA0001944

OSTI ID:: 1465792

Alternate ID(s):: OSTI ID: 1823210
OSTI ID: 2461674

Report Number(s):: 2018--150; 23--84; LLNL--JRNL-819924; LLNL-JRNL--825677; 2018-150, 1426, 2384

Journal Information:: Physics of Plasmas, Journal Name: Physics of Plasmas Journal Issue: 8 Vol. 25; ISSN 1070-664X

Publisher:: American Institute of Physics (AIP)Copyright Statement

Country of Publication:: United States

Language:: English

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