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Electrothermal instability growth in magnetically driven pulsed power liners

Physics of Plasmas

Sinars, Daniel; Yu, Edmund; Herrmann, Mark H.; Cuneo, Michael E.; Slutz, Stephen A.; Smith, Ian C.; Atherton, B.; Knudson, Marcus D.; Nakhleh, Charles

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. © 2012 American Institute of Physics.

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TYPE Journal Article YEAR 2012
OSTIScopus

Pulsed-power driven inertial confinement fusion development at Sandia National Laboratories

Proposed for publication in 5th Special Issue of the IEEE Transactions on Plasma Science Z-Pinch Plasmas.

Cuneo, Michael E.; Mazarakis, Michael G.; Lamppa, Derek C.; Kaye, Ronald J.; Nakhleh, Charles; Bailey, James E.; Hansen, Stephanie B.; Mcbride, Ryan; Herrmann, Mark H.; Lopez, Andrew J.; Peterson, K.J.; Ampleford, David J.; Jones, Michael; Savage, Mark E.; Jennings, Christopher A.; Martin, Matthew R.; Slutz, Stephen A.; Lemke, Raymond W.; Christenson, Peggy J.; Sweeney, Mary A.; Jones, Brent M.; Yu, Edmund; Mcpherson, Leroy A.; Harding, Eric H.; Knapp, P.F.; Gomez, Matthew R.; Awe, Thomas J.; Stygar, William A.; Leeper, Ramon J.; Ruiz, Carlos L.; Chandler, Gordon A.; Mckenney, John; Owen, Albert C.; Mckee, G.R.; Matzen, M.K.; Leifeste, Gordon T.; Atherton, B.; Vesey, Roger A.; Smith, Ian C.; Geissel, Matthias; Rambo, Patrick K.; Sinars, Daniel; Sefkow, Adam B.; Rovang, Dean C.; Rochau, G.A.

Abstract not provided.

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TYPE Journal Article YEAR 2012
OSTIDOI

Penetrating radiography of imploding and stagnating beryllium liners on the Z accelerator

Physical Review Letters

Mcbride, Ryan; Peterson, K.J.; Sefkow, Adam B.; Nakhleh, Charles; Laspe, Amy R.; Lopez, Mike R.; Smith, Ian C.; Atherton, B.; Savage, Mark E.; Stygar, William A.; Slutz, Stephen A.; Rogers, Thomas; Jennings, Christopher A.; Sinars, Daniel; Cuneo, Michael E.; Herrmann, Mark H.; Lemke, Raymond W.; Martin, Matthew R.; Vesey, Roger A.

Abstract not provided.

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TYPE Journal Article YEAR 2012
OSTIDOI
Results 176–200 of 392
Results 176–200 of 392