Magnetized ablative Rayleigh-Taylor instability in three dimensions
Abstract
Three-dimensional extended-magnetohydrodynamics simulations of the magnetized ablative Rayleigh-Taylor instability are presented. Previous two-dimensional (2D) simulations claiming perturbation suppression by magnetic tension are shown to be misleading, as they do not include the most unstable dimension. For perturbation modes along the applied field direction, the magnetic field simultaneously reduces ablative stabilization and adds magnetic tension stabilization; the stabilizing term is found to dominate for applied fields > 5 T, with both effects increasing in importance at short wavelengths. Additionally, for modes perpendicular to the applied field, magnetic tension does not directly stabilize the perturbation but can result in moderately slower growth due to the perturbation appearing to be 2D (albeit in a different orientation to 2D inertial confinement fusion simulations). In cases where thermal ablative stabilization is dominant the applied field increases the peak bubble-spike height. Resistive diffusion is shown to be important for short wavelengths and long timescales, reducing the effectiveness of tension stabilization.
- Authors:
-
- Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
- Publication Date:
- Research Org.:
- Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
- Sponsoring Org.:
- USDOE National Nuclear Security Administration (NNSA); USDOE Laboratory Directed Research and Development (LDRD) Program
- OSTI Identifier:
- 1860894
- Report Number(s):
- LLNL-JRNL-827517
Journal ID: ISSN 2470-0045; 1041272; TRN: US2305452
- Grant/Contract Number:
- AC52-07NA27344
- Resource Type:
- Accepted Manuscript
- Journal Name:
- Physical Review. E
- Additional Journal Information:
- Journal Volume: 105; Journal Issue: 2; Journal ID: ISSN 2470-0045
- Publisher:
- American Physical Society (APS)
- Country of Publication:
- United States
- Language:
- English
- Subject:
- 70 PLASMA PHYSICS AND FUSION TECHNOLOGY; implosion symmetry; inertial confinement fusion; magnetic field generation & plasma dynamo; magnetohydrodynamics; magnetoinertial fusion; nuclear fusion; plasma stability; plasma transport; Rayleigh-Taylor instability
Citation Formats
Walsh, C. A. Magnetized ablative Rayleigh-Taylor instability in three dimensions. United States: N. p., 2022.
Web. doi:10.1103/physreve.105.025206.
Walsh, C. A. Magnetized ablative Rayleigh-Taylor instability in three dimensions. United States. https://doi.org/10.1103/physreve.105.025206
Walsh, C. A. Wed .
"Magnetized ablative Rayleigh-Taylor instability in three dimensions". United States. https://doi.org/10.1103/physreve.105.025206. https://www.osti.gov/servlets/purl/1860894.
@article{osti_1860894,
title = {Magnetized ablative Rayleigh-Taylor instability in three dimensions},
author = {Walsh, C. A.},
abstractNote = {Three-dimensional extended-magnetohydrodynamics simulations of the magnetized ablative Rayleigh-Taylor instability are presented. Previous two-dimensional (2D) simulations claiming perturbation suppression by magnetic tension are shown to be misleading, as they do not include the most unstable dimension. For perturbation modes along the applied field direction, the magnetic field simultaneously reduces ablative stabilization and adds magnetic tension stabilization; the stabilizing term is found to dominate for applied fields > 5 T, with both effects increasing in importance at short wavelengths. Additionally, for modes perpendicular to the applied field, magnetic tension does not directly stabilize the perturbation but can result in moderately slower growth due to the perturbation appearing to be 2D (albeit in a different orientation to 2D inertial confinement fusion simulations). In cases where thermal ablative stabilization is dominant the applied field increases the peak bubble-spike height. Resistive diffusion is shown to be important for short wavelengths and long timescales, reducing the effectiveness of tension stabilization.},
doi = {10.1103/physreve.105.025206},
journal = {Physical Review. E},
number = 2,
volume = 105,
place = {United States},
year = {Wed Feb 23 00:00:00 EST 2022},
month = {Wed Feb 23 00:00:00 EST 2022}
}
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