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Title: Maintaining low-mode symmetry control with extended pulse shapes for lower-adiabat Bigfoot implosions on the National Ignition Facility

Abstract

The Bigfoot approach to indirect-drive inertial confinement fusion has been developed as a compromise trading high convergence and areal densities for high implosion velocities, large adiabats, and hydrodynamic stability. Shape control and predictability are maintained by using relatively short laser pulses and merging the shocks within the deuterium-tritium-ice layer. These design choices ultimately limit the theoretically achievable performance, and one strategy to increase the 1D performance is to reduce the shell adiabat by extending the pulse shape. However, this can result in the loss of low-mode symmetry control, as the hohlraum “bubble,” the high-Z material launched by the outer-cone beams during the early part of the laser pulse, has more time to expand and will eventually intercept inner-cone beams preventing them from reaching the hohlraum waist, thus losing an equatorial capsule drive. Experiments were performed to study the shape control and predictability with extended pulse shapes in Bigfoot implosions, reducing the adiabat from nominally α~4 to α~3 and otherwise very similar experimental parameters. Lastly, the implosion shape was measured both in-flight and at stagnation, with near-round implosions and low levels of P2 asymmetry throughout, indicating a maintained symmetry control with extended pulse shapes.

Authors:
ORCiD logo [1]; ORCiD logo [1]; ORCiD logo [1]; ORCiD logo [1];  [1]; ORCiD logo [1];  [1]; ORCiD logo [1]; ORCiD logo [1]; ORCiD logo [1];  [1];  [1]; ORCiD logo [1];  [1];  [1]
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  1. Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
Publication Date:
Research Org.:
Lawrence Livermore National Laboratory (LLNL), Livermore, CA (United States)
Sponsoring Org.:
USDOE National Nuclear Security Administration (NNSA)
OSTI Identifier:
1597590
Alternate Identifier(s):
OSTI ID: 1574545
Report Number(s):
LLNL-JRNL-782126
Journal ID: ISSN 1070-664X; 976646; TRN: US2103144
Grant/Contract Number:  
AC52-07NA27344
Resource Type:
Accepted Manuscript
Journal Name:
Physics of Plasmas
Additional Journal Information:
Journal Volume: 26; Journal Issue: 11; 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; Physics; Plasma confinement; Nuclear fuel; X-ray imager; Alpha particles; Time resolved imaging; Fluid mechanics; Radiography; X-ray camera; Hard X-rays

Citation Formats

Hohenberger, M., Casey, D. T., Thomas, C. A., Landen, O. L., Baker, K. L., Benedetti, L. R., Callahan, D. A., Hurricane, O. A., Izumi, N., Khan, S. F., Ma, T., Mariscal, D. A., Nagel, S. R., Pak, A., and Spears, B. K. Maintaining low-mode symmetry control with extended pulse shapes for lower-adiabat Bigfoot implosions on the National Ignition Facility. United States: N. p., 2019. Web. doi:10.1063/1.5121435.
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Hohenberger, M., Casey, D. T., Thomas, C. A., Landen, O. L., Baker, K. L., Benedetti, L. R., Callahan, D. A., Hurricane, O. A., Izumi, N., Khan, S. F., Ma, T., Mariscal, D. A., Nagel, S. R., Pak, A., & Spears, B. K. Maintaining low-mode symmetry control with extended pulse shapes for lower-adiabat Bigfoot implosions on the National Ignition Facility. United States. https://doi.org/10.1063/1.5121435
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Hohenberger, M., Casey, D. T., Thomas, C. A., Landen, O. L., Baker, K. L., Benedetti, L. R., Callahan, D. A., Hurricane, O. A., Izumi, N., Khan, S. F., Ma, T., Mariscal, D. A., Nagel, S. R., Pak, A., and Spears, B. K. Tue . "Maintaining low-mode symmetry control with extended pulse shapes for lower-adiabat Bigfoot implosions on the National Ignition Facility". United States. https://doi.org/10.1063/1.5121435. https://www.osti.gov/servlets/purl/1597590.
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@article{osti_1597590,
title = {Maintaining low-mode symmetry control with extended pulse shapes for lower-adiabat Bigfoot implosions on the National Ignition Facility},
author = {Hohenberger, M. and Casey, D. T. and Thomas, C. A. and Landen, O. L. and Baker, K. L. and Benedetti, L. R. and Callahan, D. A. and Hurricane, O. A. and Izumi, N. and Khan, S. F. and Ma, T. and Mariscal, D. A. and Nagel, S. R. and Pak, A. and Spears, B. K.},
abstractNote = {The Bigfoot approach to indirect-drive inertial confinement fusion has been developed as a compromise trading high convergence and areal densities for high implosion velocities, large adiabats, and hydrodynamic stability. Shape control and predictability are maintained by using relatively short laser pulses and merging the shocks within the deuterium-tritium-ice layer. These design choices ultimately limit the theoretically achievable performance, and one strategy to increase the 1D performance is to reduce the shell adiabat by extending the pulse shape. However, this can result in the loss of low-mode symmetry control, as the hohlraum “bubble,” the high-Z material launched by the outer-cone beams during the early part of the laser pulse, has more time to expand and will eventually intercept inner-cone beams preventing them from reaching the hohlraum waist, thus losing an equatorial capsule drive. Experiments were performed to study the shape control and predictability with extended pulse shapes in Bigfoot implosions, reducing the adiabat from nominally α~4 to α~3 and otherwise very similar experimental parameters. Lastly, the implosion shape was measured both in-flight and at stagnation, with near-round implosions and low levels of P2 asymmetry throughout, indicating a maintained symmetry control with extended pulse shapes.},
doi = {10.1063/1.5121435},
journal = {Physics of Plasmas},
number = 11,
volume = 26,
place = {United States},
year = {Tue Nov 19 00:00:00 EST 2019},
month = {Tue Nov 19 00:00:00 EST 2019}
}
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https://doi.org/10.1063/1.5121435
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