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Title: Long-duration direct drive hydrodynamics experiments on the National Ignition Facility: Platform development and numerical modeling with CHIC

Abstract

Here, we report on a novel planar direct-drive platform for hydrodynamics experiments on the National Ignition Facility (NIF). Its commissioning has been performed as part of the NIF Discovery Science Program. This platform enables the use of a 30 ns drive at an average intensity of 200 TW/cm2, creating a planar shock and ablation front over a 2 mm radius. To benchmark the performance of this design, the planarity of both the shock and ablation fronts has been measured between 26 ns and 28 ns after the start of the laser drive in a 3 mm-thick CH foil. The platform was then used to measure late-time Rayleigh-Taylor instability (RTI) growth at the ablation front for a 2D-rippled 300 μm-thick CH foil. Simultaneously, a numerical platform has been developed with the CHIC radiation hydrodynamics code at the CELIA laboratory. The CHIC numerical platform allows, for the first time, a complete simulation of the experiments over 30 ns to be performed. Large-scale simulations recover the trajectory and the 2D RTI growth measurements. They are additionally compared with half-mode simulations performed with identical parameters. We demonstrate that both numerical techniques fit with analytical modeling of RTI growth and discuss plans for future campaigns.

Authors:
ORCiD logo [1];  [1];  [1];  [2]; ORCiD logo [2];  [1]; ORCiD logo [2];  [2];  [2];  [2];  [3]; ORCiD logo [1]; ORCiD logo [2];  [2]; ORCiD logo [2]; ORCiD logo [1]
  1. Université de Bordeaux-CNRS-CEA (France). Centre Lasers Intenses et Applications (CELIA)
  2. Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
  3. Univ. of Rochester, NY (United States). Lab. for Laser Energetics
Publication Date:
Research Org.:
Lawrence Livermore National Laboratory (LLNL), Livermore, CA (United States)
Sponsoring Org.:
USDOE National Nuclear Security Administration (NNSA)
OSTI Identifier:
1579607
Report Number(s):
LLNL-JRNL-775319
Journal ID: ISSN 1070-664X; 967952; TRN: US2102191
Grant/Contract Number:  
AC52-07NA27344
Resource Type:
Accepted Manuscript
Journal Name:
Physics of Plasmas
Additional Journal Information:
Journal Volume: 26; Journal Issue: 8; Journal ID: ISSN 1070-664X
Publisher:
American Institute of Physics (AIP)
Country of Publication:
United States
Language:
English
Subject:
70 PLASMA PHYSICS AND FUSION TECHNOLOGY

Citation Formats

Mailliet, Corentin, Le Bel, E., Ceurvorst, L., Khan, S. F., Martinez, D., Goudal, Th., Izumi, N., Kalantar, D., Di Nicola, P., Di Nicola, J. M., Igumenshchev, I., Tikhonchuk, V. T., Remington, B., Smalyuk, V. A., Masse, L., and Casner, Alexis. Long-duration direct drive hydrodynamics experiments on the National Ignition Facility: Platform development and numerical modeling with CHIC. United States: N. p., 2019. Web. doi:10.1063/1.5110684.
Mailliet, Corentin, Le Bel, E., Ceurvorst, L., Khan, S. F., Martinez, D., Goudal, Th., Izumi, N., Kalantar, D., Di Nicola, P., Di Nicola, J. M., Igumenshchev, I., Tikhonchuk, V. T., Remington, B., Smalyuk, V. A., Masse, L., & Casner, Alexis. Long-duration direct drive hydrodynamics experiments on the National Ignition Facility: Platform development and numerical modeling with CHIC. United States. https://doi.org/10.1063/1.5110684
Mailliet, Corentin, Le Bel, E., Ceurvorst, L., Khan, S. F., Martinez, D., Goudal, Th., Izumi, N., Kalantar, D., Di Nicola, P., Di Nicola, J. M., Igumenshchev, I., Tikhonchuk, V. T., Remington, B., Smalyuk, V. A., Masse, L., and Casner, Alexis. Thu . "Long-duration direct drive hydrodynamics experiments on the National Ignition Facility: Platform development and numerical modeling with CHIC". United States. https://doi.org/10.1063/1.5110684. https://www.osti.gov/servlets/purl/1579607.
@article{osti_1579607,
title = {Long-duration direct drive hydrodynamics experiments on the National Ignition Facility: Platform development and numerical modeling with CHIC},
author = {Mailliet, Corentin and Le Bel, E. and Ceurvorst, L. and Khan, S. F. and Martinez, D. and Goudal, Th. and Izumi, N. and Kalantar, D. and Di Nicola, P. and Di Nicola, J. M. and Igumenshchev, I. and Tikhonchuk, V. T. and Remington, B. and Smalyuk, V. A. and Masse, L. and Casner, Alexis},
abstractNote = {Here, we report on a novel planar direct-drive platform for hydrodynamics experiments on the National Ignition Facility (NIF). Its commissioning has been performed as part of the NIF Discovery Science Program. This platform enables the use of a 30 ns drive at an average intensity of 200 TW/cm2, creating a planar shock and ablation front over a 2 mm radius. To benchmark the performance of this design, the planarity of both the shock and ablation fronts has been measured between 26 ns and 28 ns after the start of the laser drive in a 3 mm-thick CH foil. The platform was then used to measure late-time Rayleigh-Taylor instability (RTI) growth at the ablation front for a 2D-rippled 300 μm-thick CH foil. Simultaneously, a numerical platform has been developed with the CHIC radiation hydrodynamics code at the CELIA laboratory. The CHIC numerical platform allows, for the first time, a complete simulation of the experiments over 30 ns to be performed. Large-scale simulations recover the trajectory and the 2D RTI growth measurements. They are additionally compared with half-mode simulations performed with identical parameters. We demonstrate that both numerical techniques fit with analytical modeling of RTI growth and discuss plans for future campaigns.},
doi = {10.1063/1.5110684},
journal = {Physics of Plasmas},
number = 8,
volume = 26,
place = {United States},
year = {Thu Aug 08 00:00:00 EDT 2019},
month = {Thu Aug 08 00:00:00 EDT 2019}
}

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Figures / Tables:

FIG. 1 FIG. 1: Illustration of the experimental configuration. A 300 µm to 2 mm-thick plastic target is irradiated by 14 to 21 quadruplets of the lower NIF hemisphere. The quadruplets are stacked in time by groups of 7 to achieve a 20 ns to 30 ns-long laser pulse profile. Each beammore » is individually repointed on a 2 mm-diameter circle to create a large, uniform, super-Gaussian laser spot. A set of 7 additional quads, all fired simultaneously, is used to irradiate a silver (Ag) backlighter foil. The Ag backlighter (2 mm-wide source size) produces X-ray at 3.6 keV, which traverse the plasma and accelerated foil and are then collected using a 19 µm-diameter pinholes array onto the four strips of a Gated X-ray Detector (GXD) with a total magnification factor of ≃ 6.63. A single quad irradiates a side-on vanadium backlighter source, producing 5.2 keV X-rays collected on either GXD or a slit streak camera.« less

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