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Title: Electrothermal instability growth in magnetically driven pulsed power liners

Abstract

This paper explores the role of electro-thermal instabilities on the dynamics of magnetically accelerated implosion systems. Electro-thermal instabilities result from non-uniform heating due to temperature dependence in the conductivity of a material. Comparatively little is known about these types of instabilities compared to the well known Magneto-Rayleigh-Taylor (MRT) instability. We present simulations that show electrothermal instabilities form immediately after the surface material of a conductor melts and can act as a significant seed to subsequent MRT instability growth. We also present the results of several experiments performed on Sandia National Laboratories Z accelerator to investigate signatures of electrothermal instability growth on well characterized initially solid aluminum and copper rods driven with a 20 MA, 100 ns risetime current pulse. These experiments show excellent agreement with electrothermal instability simulations and exhibit larger instability growth than can be explained by MRT theory alone.

Authors:
; ; ; ; ; ; ; ; ;  [1]
  1. Sandia National Laboratories, P.O. Box 5800, Albuquerque, New Mexico 87185-1186 (United States)
Publication Date:
OSTI Identifier:
22086145
Resource Type:
Journal Article
Resource Relation:
Journal Name: Physics of Plasmas; Journal Volume: 19; Journal Issue: 9; Other Information: (c) 2012 American Institute of Physics; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
70 PLASMA PHYSICS AND FUSION TECHNOLOGY; ACCELERATORS; ALUMINIUM; COPPER; CURRENTS; HEATING; IMPLOSIONS; LINERS; PLASMA SIMULATION; PULSES; RAYLEIGH-TAYLOR INSTABILITY; SANDIA NATIONAL LABORATORIES; SURFACES; TEMPERATURE DEPENDENCE

Citation Formats

Peterson, Kyle J., Sinars, Daniel B., Yu, Edmund P., Herrmann, Mark C., Cuneo, Michael E., Slutz, Stephen A., Smith, Ian C., Atherton, Briggs W., Knudson, Marcus D., and Nakhleh, Charles. Electrothermal instability growth in magnetically driven pulsed power liners. United States: N. p., 2012. Web. doi:10.1063/1.4751868.
Peterson, Kyle J., Sinars, Daniel B., Yu, Edmund P., Herrmann, Mark C., Cuneo, Michael E., Slutz, Stephen A., Smith, Ian C., Atherton, Briggs W., Knudson, Marcus D., & Nakhleh, Charles. Electrothermal instability growth in magnetically driven pulsed power liners. United States. doi:10.1063/1.4751868.
Peterson, Kyle J., Sinars, Daniel B., Yu, Edmund P., Herrmann, Mark C., Cuneo, Michael E., Slutz, Stephen A., Smith, Ian C., Atherton, Briggs W., Knudson, Marcus D., and Nakhleh, Charles. Sat . "Electrothermal instability growth in magnetically driven pulsed power liners". United States. doi:10.1063/1.4751868.
@article{osti_22086145,
title = {Electrothermal instability growth in magnetically driven pulsed power liners},
author = {Peterson, Kyle J. and Sinars, Daniel B. and Yu, Edmund P. and Herrmann, Mark C. and Cuneo, Michael E. and Slutz, Stephen A. and Smith, Ian C. and Atherton, Briggs W. and Knudson, Marcus D. and Nakhleh, Charles},
abstractNote = {This paper explores the role of electro-thermal instabilities on the dynamics of magnetically accelerated implosion systems. Electro-thermal instabilities result from non-uniform heating due to temperature dependence in the conductivity of a material. Comparatively little is known about these types of instabilities compared to the well known Magneto-Rayleigh-Taylor (MRT) instability. We present simulations that show electrothermal instabilities form immediately after the surface material of a conductor melts and can act as a significant seed to subsequent MRT instability growth. We also present the results of several experiments performed on Sandia National Laboratories Z accelerator to investigate signatures of electrothermal instability growth on well characterized initially solid aluminum and copper rods driven with a 20 MA, 100 ns risetime current pulse. These experiments show excellent agreement with electrothermal instability simulations and exhibit larger instability growth than can be explained by MRT theory alone.},
doi = {10.1063/1.4751868},
journal = {Physics of Plasmas},
number = 9,
volume = 19,
place = {United States},
year = {Sat Sep 15 00:00:00 EDT 2012},
month = {Sat Sep 15 00:00:00 EDT 2012}
}