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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]

Journal Article · · Physical Review Letters

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.

Research Organization:
Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
Sponsoring Organization:
USDOE
Grant/Contract Number:
AC52-07NA27344
OSTI ID:
1411686
Report Number(s):
LLNL-JRNL-644035; PRLTAO; TRN: US1800273
Journal Information:
Physical Review Letters, Vol. 112, Issue 10; ISSN 0031-9007
Publisher:
American Physical Society (APS)Copyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 79 works
Citation information provided by
Web of Science

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Cited By (35)

First experimental comparisons of laser-plasma interactions between spherical and cylindrical hohlraums at SGIII laser facility journal March 2017
Inertial-confinement fusion with lasers journal May 2016
First exploration of radiation temperatures of the laser spot, re-emitting wall and entire hohlraum drive source journal March 2019
A novel three-axis cylindrical hohlraum designed for inertial confinement fusion ignition journal October 2016
An in-flight radiography platform to measure hydrodynamic instability growth in inertial confinement fusion capsules at the National Ignition Facility journal July 2014
X-ray conversion efficiency and radiation non-uniformity in the hohlraum experiments at Shenguang-III prototype laser facility journal November 2014
Radiation hydrodynamics modeling of the highest compression inertial confinement fusion ignition experiment from the National Ignition Campaign journal February 2015
Angular radiation temperature simulation for time-dependent capsule drive prediction in inertial confinement fusion journal February 2015
Quantifying equation-of-state and opacity errors using integrated supersonic diffusive radiation flow experiments on the National Ignition Facility journal April 2015
Exponential yield sensitivity to long-wavelength asymmetries in three-dimensional simulations of inertial confinement fusion capsule implosions journal August 2015
The size and structure of the laser entrance hole in gas-filled hohlraums at the National Ignition Facility journal December 2015
Time history prediction of direct-drive implosions on the Omega facility journal January 2016
Three-dimensional simulations of low foot and high foot implosion experiments on the National Ignition Facility journal March 2016
First beryllium capsule implosions on the National Ignition Facility journal May 2016
Integrated modeling of cryogenic layered highfoot experiments at the NIF journal May 2016
Detailed high-resolution three-dimensional simulations of OMEGA separated reactants inertial confinement fusion experiments journal July 2016
Investigating the hohlraum radiation properties through the angular distribution of the radiation temperature journal August 2016
Observation of hohlraum-wall motion with spectrally selective x-ray imaging at the National Ignition Facility journal August 2016
A hybrid-drive nonisobaric-ignition scheme for inertial confinement fusion journal August 2016
High-resolution modeling of indirectly driven high-convergence layered inertial confinement fusion capsule implosions journal May 2017
Performance of beryllium targets with full-scale capsules in low-fill 6.72-mm hohlraums on the National Ignition Facility journal May 2017
The relationship between gas fill density and hohlraum drive performance at the National Ignition Facility journal May 2017
Backscatter spectra measurements of the two beams on the same cone on Shenguang-III laser facility journal January 2018
Capsule physics comparison of National Ignition Facility implosion designs using plastic, high density carbon, and beryllium ablators journal March 2018
Exploring the limits of case-to-capsule ratio, pulse length, and picket energy for symmetric hohlraum drive on the National Ignition Facility Laser journal May 2018
First demonstration of improved capsule implosions by reducing radiation preheat in uranium vs gold hohlraums journal September 2018
Robustness to hydrodynamic instabilities in indirectly driven layered capsule implosions journal January 2019
Three-dimensional modeling and hydrodynamic scaling of National Ignition Facility implosions journal May 2019
Saturation of cross-beam energy transfer for multispeckled laser beams involving both ion and electron dynamics journal August 2019
Understanding ICF hohlraums using NIF gated laser-entrance-hole images journal February 2020
Indirect drive ignition at the National Ignition Facility journal October 2016
Heat transport modeling of the dot spectroscopy platform on NIF journal February 2018
Incorporating kinetic effects on Nernst advection in inertial fusion simulations journal June 2018
Experimental demonstration of low laser-plasma instabilities in gas-filled spherical hohlraums at laser injection angle designed for ignition target journal March 2017
A novel three-axis cylindrical hohlraum designed for inertial confinement fusion ignition preprint January 2016

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