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Title: Power Flow in Pulsed-Power Systems: The Influence of Hall Physics and Modeling of the Plasma-Vacuum Interface

Abstract

Extended-MHD simulations of power flow along a pulsed-power transmission line are performed here in a 2-D axisymmetric geometry, in particular looking at the influence of Hall physics for a transmission line coupled to the liner used in a magnetized liner inertial fusion experiment at Sandia National Labs. It was recently shown by the authors that, for a coaxial transmission line, when Hall physics is included, significantly more blow-off occurs from plasma initialized against the anode compared to the cathode. The mechanism of this blow-off was traced to electron Ex B drift modeled by the Hall term. This result is also observed for the present simulations, and it is shown that the anode blow-off significantly delays the coupling of current to the liner. It is also found that Hall MHD and MHD results are sensitive to the treatment of density floors and the plasma-vacuum interface. Although MHD shows more sensitivity than Hall MHD, correct modeling of the transition from plasma to vacuum remains an unsolved problem that must be addressed in order to improve the predictive capability of fluid-based power flow simulations with regard to energy coupling.

Authors:
ORCiD logo [1];  [2]
  1. Sandia National Lab. (SNL-NM), Albuquerque, NM (United States)
  2. Cornell Univ., Ithaca, NY (United States). Lab. of Plasma Studies
Publication Date:
Research Org.:
Sandia National Lab. (SNL-NM), Albuquerque, NM (United States); Cornell Univ., Ithaca, NY (United States)
Sponsoring Org.:
USDOE National Nuclear Security Administration (NNSA)
OSTI Identifier:
1507743
Report Number(s):
SAND-2019-2344J
Journal ID: ISSN 0093-3813; 673100
Grant/Contract Number:  
NA0003525; NA0001836
Resource Type:
Accepted Manuscript
Journal Name:
IEEE Transactions on Plasma Science
Additional Journal Information:
Journal Name: IEEE Transactions on Plasma Science; Journal ID: ISSN 0093-3813
Publisher:
IEEE
Country of Publication:
United States
Language:
English
Subject:
70 PLASMA PHYSICS AND FUSION TECHNOLOGY; ablation; inertial confinement; magnetohydrodynamics; numerical stability; plasma stability; pulse power systems

Citation Formats

Hamlin, Nathaniel D., and Seyler, Charles E.. Power Flow in Pulsed-Power Systems: The Influence of Hall Physics and Modeling of the Plasma-Vacuum Interface. United States: N. p., 2019. Web. doi:10.1109/TPS.2019.2903843.
Hamlin, Nathaniel D., & Seyler, Charles E.. Power Flow in Pulsed-Power Systems: The Influence of Hall Physics and Modeling of the Plasma-Vacuum Interface. United States. doi:10.1109/TPS.2019.2903843.
Hamlin, Nathaniel D., and Seyler, Charles E.. Wed . "Power Flow in Pulsed-Power Systems: The Influence of Hall Physics and Modeling of the Plasma-Vacuum Interface". United States. doi:10.1109/TPS.2019.2903843.
@article{osti_1507743,
title = {Power Flow in Pulsed-Power Systems: The Influence of Hall Physics and Modeling of the Plasma-Vacuum Interface},
author = {Hamlin, Nathaniel D. and Seyler, Charles E.},
abstractNote = {Extended-MHD simulations of power flow along a pulsed-power transmission line are performed here in a 2-D axisymmetric geometry, in particular looking at the influence of Hall physics for a transmission line coupled to the liner used in a magnetized liner inertial fusion experiment at Sandia National Labs. It was recently shown by the authors that, for a coaxial transmission line, when Hall physics is included, significantly more blow-off occurs from plasma initialized against the anode compared to the cathode. The mechanism of this blow-off was traced to electron Ex B drift modeled by the Hall term. This result is also observed for the present simulations, and it is shown that the anode blow-off significantly delays the coupling of current to the liner. It is also found that Hall MHD and MHD results are sensitive to the treatment of density floors and the plasma-vacuum interface. Although MHD shows more sensitivity than Hall MHD, correct modeling of the transition from plasma to vacuum remains an unsolved problem that must be addressed in order to improve the predictive capability of fluid-based power flow simulations with regard to energy coupling.},
doi = {10.1109/TPS.2019.2903843},
journal = {IEEE Transactions on Plasma Science},
number = ,
volume = ,
place = {United States},
year = {2019},
month = {4}
}

Journal Article:
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This content will become publicly available on April 3, 2020
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