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Title: The influence of Hall physics on power-flow along a coaxial transmission line

Abstract

Extended-MHD simulations of a coaxial transmission line are performed in axisymmetric cylindrical geometry, in particular, in examining the influence of Hall physics on a plasma layer initialized against the anode versus the cathode, for which an MHD model is insensitive. The results indicate that Hall physics is required in order to model an electron E × B drift current in the electrode plasma, which is parallel to the anode current and opposite the cathode current. This results in confinement of the electrode plasma when initialized against the cathode and expansion of the plasma layer when initialized against the anode. The expansion in the anode-initialized case results in filaments of plasma bridging the gap, causing substantial power-flow losses. These results represent the first fluid simulations of power-flow, to our knowledge, that, by including Hall physics, recover fundamental aspects of anode and cathode dynamics predicted by kinetic theory while simulating over a dynamic range (nine orders of magnitude density variation from solid-density electrodes down to low-density electrode plasma) which is prohibitive for Particle-In-Cell (PIC) codes. In conclusion, this work demonstrates the need for further development of extended-MHD and two-fluid modeling of power-flow dynamics, which, possibly through hybridization with a PIC code, willmore » eventually culminate in a code with reliable predictive capability for power-flow coupling and energy losses in pulsed-power systems.« less

Authors:
ORCiD logo [1]; ORCiD logo [2]
+ Show Author Affiliations
  1. Cornell Univ., Ithaca, NY (United States)
  2. Cornell Univ., Ithaca, NY (United States); Sandia National Lab. (SNL-NM), Albuquerque, NM (United States)
Publication Date:
Research Org.:
Cornell Univ., Ithaca, NY (United States)
Sponsoring Org.:
USDOE National Nuclear Security Administration (NNSA)
OSTI Identifier:
1499667
Alternate Identifier(s):
OSTI ID: 1478280
Grant/Contract Number:  
NA0003764; FOA-0001153; FOA-0003764; NA0001836
Resource Type:
Accepted Manuscript
Journal Name:
Physics of Plasmas
Additional Journal Information:
Journal Volume: 25; 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

Citation Formats

Hamlin, N. D., and Seyler, C. E. The influence of Hall physics on power-flow along a coaxial transmission line. United States: N. p., 2018. Web. doi:10.1063/1.5042441.
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Hamlin, N. D., & Seyler, C. E. The influence of Hall physics on power-flow along a coaxial transmission line. United States. https://doi.org/10.1063/1.5042441
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Hamlin, N. D., and Seyler, C. E. Fri . "The influence of Hall physics on power-flow along a coaxial transmission line". United States. https://doi.org/10.1063/1.5042441. https://www.osti.gov/servlets/purl/1499667.
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@article{osti_1499667,
title = {The influence of Hall physics on power-flow along a coaxial transmission line},
author = {Hamlin, N. D. and Seyler, C. E.},
abstractNote = {Extended-MHD simulations of a coaxial transmission line are performed in axisymmetric cylindrical geometry, in particular, in examining the influence of Hall physics on a plasma layer initialized against the anode versus the cathode, for which an MHD model is insensitive. The results indicate that Hall physics is required in order to model an electron E × B drift current in the electrode plasma, which is parallel to the anode current and opposite the cathode current. This results in confinement of the electrode plasma when initialized against the cathode and expansion of the plasma layer when initialized against the anode. The expansion in the anode-initialized case results in filaments of plasma bridging the gap, causing substantial power-flow losses. These results represent the first fluid simulations of power-flow, to our knowledge, that, by including Hall physics, recover fundamental aspects of anode and cathode dynamics predicted by kinetic theory while simulating over a dynamic range (nine orders of magnitude density variation from solid-density electrodes down to low-density electrode plasma) which is prohibitive for Particle-In-Cell (PIC) codes. In conclusion, this work demonstrates the need for further development of extended-MHD and two-fluid modeling of power-flow dynamics, which, possibly through hybridization with a PIC code, will eventually culminate in a code with reliable predictive capability for power-flow coupling and energy losses in pulsed-power systems.},
doi = {10.1063/1.5042441},
journal = {Physics of Plasmas},
number = 10,
volume = 25,
place = {United States},
year = {Fri Oct 19 00:00:00 EDT 2018},
month = {Fri Oct 19 00:00:00 EDT 2018}
}
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Journal Article:
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Publisher's Version of Record
https://doi.org/10.1063/1.5042441
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Cited by: 4 works
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Figures / Tables:

FIG. 1 FIG. 1: Coaxial transmission line. Inner radius is 23 mm, the gap between the inner and outer conductors is 6.5 mm. Simulation region (cylindrical axisymmetric) is shown in red. Driving current follows a sine-squared profile to 20 MA in 100 ns.
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    Works referencing / citing this record:

    Drift-ideal magnetohydrodynamic simulations of m   =  0 modes in Z-pinch plasmas
    journal, July 2019

    • Angus, J. R.; Dorf, M.; Geyko, V. I.
    • Physics of Plasmas, Vol. 26, Issue 7
    • DOI: 10.1063/1.5093625

    Linear response of a Hall magnetic drift wave for verification of Hall MHD algorithms
    journal, July 2019

    • Farmer, W. A.; Ellison, C. L.; Hammer, J. H.
    • Physics of Plasmas, Vol. 26, Issue 7
    • DOI: 10.1063/1.5094349
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      Figures / Tables found in this record:

      FIG. 1 (p. 6)figure
      FIG. 2 (p. 6)figure
      FIG. 3 (p. 7)figure
      FIG. 4 (p. 7)figure
      FIG. 5 (p. 8)figure
      FIG. 6 (p. 9)figure
      FIG. 7 (p. 9)figure
      FIG. 8 (p. 10)figure
      FIG. 9 (p. 10)figure
      FIG. 10 (p. 11)figure
      FIG. 11 (p. 11)figure
      FIG. 12 (p. 12)figure
      FIG. 13 (p. 12)figure
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