The effects of multispecies Hohlraum walls on stimulated Brillouin scattering, Hohlraum dynamics, and beam propagation

Ralph, J. E.; Kemp, A.; Meezan, N. B.; Berger, R. L.; Strozzi, D.; MacGowan, B. J.; Landen, O.; Lemos, N.; Belyaev, M.; Biener, M.; Callahan, D. A.; Chapman, T.; Divol, L.; Hinkel, D. E.; Moody, J.; Nikroo, A.; Jones, O.; Schiaffino, S.; Stadermann, M.; Michel, P.

doi:10.1063/5.0044404

The effects of multispecies Hohlraum walls on stimulated Brillouin scattering, Hohlraum dynamics, and beam propagation

Journal Article · Tue Jul 20 00:00:00 UTC 2021 · Physics of Plasmas

DOI:https://doi.org/10.1063/5.0044404· OSTI ID:1860800

^[1]; ^[1]; ^[1]; ^[1]; ^[1]; MacGowan, B. J. ^[1]; ^[1]; ^[1]; ^[1]; Biener, M. ^[1]; ^[1]; ^[1]; Divol, L. ^[1]; Hinkel, D. E. ^[1]; ^[1]; ^[1]; Jones, O. ^[1]; Schiaffino, S. ^[1]; Stadermann, M. ^[1]; Michel, P. ^[1]

Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)

We report experiments and simulations have been conducted to investigate the efficacy of Ta₂O₅-lined Hohlraum walls at reducing stimulated Brillouin backscattering (SBS) as well as any subsequent effects on the Hohlraum dynamics and capsule implosions in indirect drive experiments at the National Ignition Facility. Using a 1.1 MJ 400 TW, 351 nm, shaped laser pulse, we measure a 5× reduction in SBS power in the peak of the pulse from the wall on the outer 50° cone beams. The SBS spectrum indicates a reduction in the high-Z spectral signature when using multispecies wall materials. Detailed hydrodynamic simulations were performed using different heat conduction models with flux limiters. Additional simulations were performed on the plasma maps using the 3D parallel paraxial code pF3D to compare backscatter powers between the pure Au and Ta₂O₅-lined Hohlraums. Further analysis, using hydrodynamically equivalent plasmas, shows that the SBS reduction is clearly a result of the added ion Landau damping caused by the oxygen ions and not from differences in plasma conditions. The experimental and simulation results also show an increase in the wall plasma expansion when using the Ta₂O₅ liner leading to a 70% more oblate implosion.

View Accepted Manuscript (DOE)

Research Organization:: Lawrence Livermore National Laboratory (LLNL), Livermore, CA (United States)

Sponsoring Organization:: General Atomics; USDOE; USDOE National Nuclear Security Administration (NNSA)

Grant/Contract Number:: AC52-07NA27344; NA0001808

OSTI ID:: 1860800

Alternate ID(s):: OSTI ID: 1808724

Report Number(s):: LLNL-JRNL-832507; 1050152

Journal Information:: Physics of Plasmas, Journal Name: Physics of Plasmas Journal Issue: 7 Vol. 28; ISSN 1070-664X

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

Country of Publication:: United States

Language:: English

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