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Three-dimensional magnetohydrodynamic modeling of auto-magnetizing liner implosions on the Z accelerator
Abstract
Auto-magnetizing (AutoMag) liners are cylindrical tubes that employ helical current flow to produce strong internal axial magnetic fields prior to radial implosion on ~100 ns timescales. AutoMag liners have demonstrated strong uncompressed axial magnetic field production (>100 T) and remarkable implosion uniformity during experiments on the 20 MA Z accelerator. However, both axial field production and implosion morphology require further optimization to support the use of AutoMag targets in magnetized liner inertial fusion (MagLIF) experiments. Data from experiments studying the initiation and evolution of dielectric flashover in AutoMag targets on the Mykonos accelerator have enabled the advancement of magnetohydrodynamic (MHD) modeling protocols used to simulate AutoMag liner implosions. Implementing these protocols using ALEGRA has improved the comparison of simulations to radiographic data. Specifically, both the liner in-flight aspect ratio and the observed width of the encapsulant-filled helical gaps during implosion in ALEGRA simulations agree more closely with radiography data compared to previous GORGON simulations. Although simulations fail to precisely reproduce the measured internal axial magnetic field production, improved agreement with radiography data inspired the evaluation of potential design improvements with newly developed modeling protocols. Three-dimensional MHD simulation studies focused on improving AutoMag target designs, specifically seeking to optimize the axialmore »
- Publication Date:
- Research Org.:
- Sandia National Lab. (SNL-NM), Albuquerque, NM (United States)
- Sponsoring Org.:
- USDOE National Nuclear Security Administration (NNSA); USDOE Laboratory Directed Research and Development (LDRD) Program
- OSTI Identifier:
- 2311415
- Report Number(s):
- SAND-2023-11395J
Journal ID: ISSN 1070-664X
- Grant/Contract Number:
- NA0003525; NA0003864
- Resource Type:
- Accepted Manuscript
- Journal Name:
- Physics of Plasmas
- Additional Journal Information:
- Journal Volume: 30; Journal Issue: 10; 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; joule heating; dielectric properties; electrical conductivity; computer simulation; magnetohydrodynamics; plasma instabilities; radiography
Citation Formats
Shipley, Gabriel A., and Awe, Thomas James. Three-dimensional magnetohydrodynamic modeling of auto-magnetizing liner implosions on the Z accelerator. United States: N. p., 2023.
Web. doi:10.1063/5.0162359.
Shipley, Gabriel A., & Awe, Thomas James. Three-dimensional magnetohydrodynamic modeling of auto-magnetizing liner implosions on the Z accelerator. United States. https://doi.org/10.1063/5.0162359
Shipley, Gabriel A., and Awe, Thomas James. Mon .
"Three-dimensional magnetohydrodynamic modeling of auto-magnetizing liner implosions on the Z accelerator". United States. https://doi.org/10.1063/5.0162359.
@article{osti_2311415,
title = {Three-dimensional magnetohydrodynamic modeling of auto-magnetizing liner implosions on the Z accelerator},
author = {Shipley, Gabriel A. and Awe, Thomas James},
abstractNote = {Auto-magnetizing (AutoMag) liners are cylindrical tubes that employ helical current flow to produce strong internal axial magnetic fields prior to radial implosion on ~100 ns timescales. AutoMag liners have demonstrated strong uncompressed axial magnetic field production (>100 T) and remarkable implosion uniformity during experiments on the 20 MA Z accelerator. However, both axial field production and implosion morphology require further optimization to support the use of AutoMag targets in magnetized liner inertial fusion (MagLIF) experiments. Data from experiments studying the initiation and evolution of dielectric flashover in AutoMag targets on the Mykonos accelerator have enabled the advancement of magnetohydrodynamic (MHD) modeling protocols used to simulate AutoMag liner implosions. Implementing these protocols using ALEGRA has improved the comparison of simulations to radiographic data. Specifically, both the liner in-flight aspect ratio and the observed width of the encapsulant-filled helical gaps during implosion in ALEGRA simulations agree more closely with radiography data compared to previous GORGON simulations. Although simulations fail to precisely reproduce the measured internal axial magnetic field production, improved agreement with radiography data inspired the evaluation of potential design improvements with newly developed modeling protocols. Three-dimensional MHD simulation studies focused on improving AutoMag target designs, specifically seeking to optimize the axial magnetic field production and enhance the cylindrical implosion uniformity for MagLIF. Importantly, by eliminating the driver current prepulse and reducing the initial inter-helix gap widths in AutoMag liners, simulations indicate that the optimal 30–50 T range of precompressed axial magnetic field for MagLIF on Z can be accomplished concurrently with improved cylindrical implosion uniformity.},
doi = {10.1063/5.0162359},
journal = {Physics of Plasmas},
number = 10,
volume = 30,
place = {United States},
year = {Mon Oct 23 00:00:00 EDT 2023},
month = {Mon Oct 23 00:00:00 EDT 2023}
}
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