Novel Characterization of Capsule X-Ray Drive at the National Ignition Facility [Using ViewFactor Experiments to Measure Hohlraum X-Radiation Drive from the Capsule Point-of-View in Ignition Experiments on the National Ignition Facility]

MacLaren, S. A.; Schneider, M. B.; Widmann, K.; Hammer, J. H.; Yoxall, B. E.; Moody, J. D.; Bell, P. M.; Benedetti, L. R.; Bradley, D. K.; Edwards, M. J.; Guymer, T. M.; Hinkel, D. E.; Hsing, W. W.; Kervin, M. L.; Meezan, N. B.; Moore, A. S.; Ralph, J. E.

doi:10.1103/PhysRevLett.112.105003

Title: Novel Characterization of Capsule X-Ray Drive at the National Ignition Facility [Using ViewFactor Experiments to Measure Hohlraum X-Radiation Drive from the Capsule Point-of-View in Ignition Experiments on the National Ignition Facility]

Journal Article · 13 March 2014 · Physical Review Letters

DOI: https://doi.org/10.1103/PhysRevLett.112.105003 · OSTI ID:1411686

MacLaren, S. A. ^[1]; Schneider, M. B. ^[1]; Widmann, K. ^[1]; Hammer, J. H. ^[1]; Yoxall, B. E. ^[1]; Moody, J. D. ^[1]; Bell, P. M. ^[1]; Benedetti, L. R. ^[1]; Bradley, D. K. ^[1]; Edwards, M. J. ^[1]; Guymer, T. M. ^[2]; Hinkel, D. E. ^[1]; Hsing, W. W. ^[1]; Kervin, M. L. ^[1]; Meezan, N. B. ^[1]; Moore, A. S. ^[2]; Ralph, J. E. ^[1]

Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
Atomic Weapons Establishment, Reading (United Kingdom)

Here, indirect drive experiments at the National Ignition Facility are designed to achieve fusion by imploding a fuel capsule with x rays from a laser-driven hohlraum. Previous experiments have been unable to determine whether a deficit in measured ablator implosion velocity relative to simulations is due to inadequate models of the hohlraum or ablator physics. ViewFactor experiments allow for the first time a direct measure of the x-ray drive from the capsule point of view. The experiments show a 15%–25% deficit relative to simulations and thus explain nearly all of the disagreement with the velocity data. In addition, the data from this open geometry provide much greater constraints on a predictive model of laser-driven hohlraum performance than the nominal ignition target.

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

Sponsoring Organization:: USDOE

Grant/Contract Number:: AC52-07NA27344

OSTI ID:: 1411686

Report Number(s):: LLNL-JRNL--644035

Journal Information:: Physical Review Letters, Journal Name: Physical Review Letters Journal Issue: 10 Vol. 112; ISSN 0031-9007; ISSN PRLTAO

Publisher:: American Physical Society (APS)Copyright Statement

Country of Publication:: United States

Language:: English

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Title: Novel Characterization of Capsule X-Ray Drive at the National Ignition Facility [Using ViewFactor Experiments to Measure Hohlraum X-Radiation Drive from the Capsule Point-of-View in Ignition Experiments on the National Ignition Facility]

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