Understanding ICF hohlraums using NIF gated laser-entrance-hole images

Chen, Hui; Woods, D. T.; Jones, O. S.; Benedetti, L. R.; Dewald, E. L.; Izumi, N.; MacLaren, S. A.; Meezan, N. B.; Moody, J. D.; Palmer, N. E.; Schneider, M. B.; Vandenboomgaerde, M.

doi:10.1063/1.5128501

Understanding ICF hohlraums using NIF gated laser-entrance-hole images

Journal Article · Thu Feb 06 00:00:00 EST 2020 · Physics of Plasmas

DOI:https://doi.org/10.1063/1.5128501· OSTI ID:1632379

^[1]; ^[1]; ^[1]; ^[1]; Dewald, E. L. ^[1]; ^[1]; ^[1]; ^[1]; Moody, J. D. ^[1]; Palmer, N. E. ^[1]; ^[1]; Vandenboomgaerde, M. ^[2]

Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
Commissariat a l'Energie Atomique (CEA), Arpajon (France)

The newly available ns-gated laser-entrance-hole (LEH) imager on the National Ignition Facility provides routine, non-perturbative measurements of the x-ray emission from laser-heated plasmas inside the hohlraum as viewed at 19° to the hohlraum axis through one of its LEHs. Multiple images are acquired for a series of times and filter-selected x-ray energy bands within a single shot. The images provide time dependent data on phenomena including the effective radius of the LEH, the length of the gold-plasma “bubble” evolving off the interior wall surface heated by the outer beams, the evolving radius of the x-ray heated hohlraum wall, and the radius of the ablation front of the fusion capsule. Here, these measurements are explained and illustrated with sample data. These techniques are then applied to understand hohlraum behavior as a function of gas fill. For hohlraums with helium gas fill densities of 0.15 to 0.30 mg/cm³, synthetic images computed from simulations agree well with experimental gated LEH images when an inhibited heat transport model [Jones et al., Phys. Plasmas 24, 056312 (2017)] is used. This model can be adjusted to reproduce the expansion rate of the laser-heated plasma bubble in such a way as to improve agreement with the images. At the higher 0.6 mg/cc gas fill, the experimental images show more pronounced 3D features, resulting in slightly less good agreement with the 2D simulations.

View Accepted Manuscript (DOE)

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

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

Grant/Contract Number:: AC52-07NA27344

OSTI ID:: 1632379

Alternate ID(s):: OSTI ID: 1598078

Report Number(s):: LLNL-JRNL--790517; 988625

Journal Information:: Physics of Plasmas, Journal Name: Physics of Plasmas Journal Issue: 2 Vol. 27; ISSN 1070-664X

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

Country of Publication:: United States

Language:: English

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