Development of an x-ray radiography platform to study laser-direct-drive energy coupling at the National Ignition Facility

Ceurvorst, L.; Theobald, W.; Rosenberg, M. J.; Radha, P. B.; Stoeckl, C.; Betti, R.; Anderson, K. S.; Marozas, J. A.; Goncharov, V. N.; Campbell, E. M.; Shuldberg, C. M.; Luo, R. W.; Sweet, W.; Aghaian, L.; Carlson, L.; Bachmann, B.; Döppner, T.; Hohenberger, M.; Glize, K.; Scott, R. H. H.; Colaïtis, A.; Regan, S. P.

doi:10.1063/5.0098982

Title: Development of an x-ray radiography platform to study laser-direct-drive energy coupling at the National Ignition Facility

Journal Article · Thu Oct 27 00:00:00 EDT 2022 · Review of Scientific Instruments

DOI:https://doi.org/10.1063/5.0098982· OSTI ID:1901553

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Univ. of Rochester, NY (United States)
General Atomics, San Diego, CA (United States)
Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
STFC Rutherford Appleton Lab., Oxfordshire (United Kingdom)
Univ. de Bordeaux-CNRS-CEA, Talence (France)

A platform has been developed to study laser-direct-drive energy coupling at the National Ignition Facility (NIF) using a plastic sphere target irradiated in a polar-direct-drive geometry to launch a spherically converging shock wave. To diagnose this system evolution, eight NIF laser beams are directed onto a curved Cu foil to generate Heα line emission at a photon energy of 8.4 keV. These x rays are collected by a 100-ps gated x-ray imager in the opposing port to produce temporally gated radiographs. The platform is capable of acquiring images during and after the laser drive launches the shock wave. A backlighter profile is fit to the radiographs, and the resulting transmission images are Abel inverted to infer radial density profiles of the shock front and to track its temporal evolution. The measurements provide experimental shock trajectories and radial density profiles that are compared to 2D radiation-hydrodynamic simulations using cross-beam energy transfer and nonlocal heat-transport models.

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Research Organization:: Univ. of Rochester, NY (United States)

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

Grant/Contract Number:: NA0003856

OSTI ID:: 1901553

Alternate ID(s):: OSTI ID: 1894982

Journal Information:: Review of Scientific Instruments, Vol. 93, Issue 10; ISSN 0034-6748

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

Country of Publication:: United States

Language:: English

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