Experimental demonstration of the reduced expansion of a laser-heated surface using a low density foam layer, pertaining to advanced hohlraum designs with less wall-motion

Moore, A. S.; Meezan, N. B.; Thomas, C. A.; Bhandarkar, S. D.; Divol, L.; Izumi, N.; Nikroo, A.; Baumann, T. F.; Rubery, M. S.; Williams, J.; Alfonso, N.; Landen, O. L.; Hsing, W. W.; Moody, J. D.

doi:10.1063/5.0009857

Experimental demonstration of the reduced expansion of a laser-heated surface using a low density foam layer, pertaining to advanced hohlraum designs with less wall-motion

Journal Article · Mon Aug 17 00:00:00 UTC 2020 · Physics of Plasmas

DOI:https://doi.org/10.1063/5.0009857· OSTI ID:1708992

^[1]; ^[1]; Thomas, C. A. ^[2]; Bhandarkar, S. D. ^[1]; Divol, L. ^[1]; ^[1]; ^[1]; Baumann, T. F. ^[1]; Rubery, M. S. ^[3]; Williams, J. ^[4]; Alfonso, N. ^[4]; ^[1]; Hsing, W. W. ^[1]; ^[1]

Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
Univ. of Rochester, NY (United States). Lab. for Laser Energetics
Atomic Weapons Establishment (AWE), Reading (United Kingdom)
General Atomics, San Diego, CA (United States)

The ablative expansion of laser-heated materials is important for determining how hohlraum cavities can be utilized for inertial confinement fusion. The utility of a low-density foam layer to reduce the density of the expanding heated hohlraum wall is demonstrated here in a series of experiments on the National Ignition Facility. X-ray radiography measurements of the expanding foam-lined Au wall in low aspect-ratio cylindrical geometry are used to compare the impact of Au-doped CH and Ta₂O₅ foams between 10 and 40 mg/cc on the wall expansion. HYDRA Simulations are used to estimate the x-ray transmission at the 1/4 nc surface, which is important in understanding the absorption of laser light by the plasma. These demonstrate for the first time that a foam layer reduces the expansion of a hohlraum-like target and illustrate that the interplay between the expanding foam plasma and the shock reflected by the hohlraum wall is critical in optimizing foam-liner parameters to achieve the maximum time for a symmetric drive on a capsule.

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; NA0001808

OSTI ID:: 1708992

Alternate ID(s):: OSTI ID: 1647678

Report Number(s):: LLNL-JRNL--806541; 1011389

Journal Information:: Physics of Plasmas, Journal Name: Physics of Plasmas Journal Issue: 8 Vol. 27; ISSN 1070-664X

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

Country of Publication:: United States

Language:: English

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Experimental demonstration of the reduced expansion of a laser-heated surface using a low density foam layer, pertaining to advanced hohlraum designs with less wall-motion

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