Direct measurements of anode/cathode gap plasma in cylindrically imploding loads on the Z machine

Porwitzky, Andrew James; Dolan, D. H.; Martin, Matthew R.; Laity, George Russell; Lemke, R. W.; Mattsson, Thomas R.

doi:10.1063/1.5026225

Direct measurements of anode/cathode gap plasma in cylindrically imploding loads on the Z machine

Journal Article · Tue Jun 12 00:00:00 EDT 2018 · Physics of Plasmas

DOI:https://doi.org/10.1063/1.5026225· OSTI ID:1464201

Porwitzky, Andrew James ^[1]; ^[1]; Martin, Matthew R. ^[1]; Laity, George Russell ^[1]; ^[1]; Mattsson, Thomas R. ^[1]

Sandia National Lab. (SNL-NM), Albuquerque, NM (United States)

By deploying a photon Doppler velocimetry based plasma diagnostic, we have directly observed low density plasma in the load anode/cathode gap of cylindrically converging pulsed power targets. The arrival of this plasma is temporally correlated with gross current loss and subtle power flow differences between the anode and the cathode. The density is in the range where Hall terms in the electromagnetic equations are relevant, but this physics is lacking in the magnetohydrodynamics codes commonly used to design, analyze, and optimize pulsed power experiments. Here, the present work presents evidence of the importance of physics beyond traditional resistive magnetohydrodynamics for the design of pulsed power targets and drivers.

Research Organization:: Sandia National Laboratories (SNL-NM), Albuquerque, NM (United States)

Sponsoring Organization:: USDOE National Nuclear Security Administration (NNSA)

Grant/Contract Number:: AC04-94AL85000

OSTI ID:: 1464201

Report Number(s):: SAND--2018-0099J; 666467

Journal Information:: Physics of Plasmas, Journal Name: Physics of Plasmas Journal Issue: 6 Vol. 25; ISSN 1070-664X

Publisher:: American Institute of Physics (AIP)Copyright Statement

Country of Publication:: United States

Language:: English

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Reduction of ablated surface expansion in pulsed-power-driven experiments using an aerosol dielectric coating Evans, M.; Adams, M. B.; Campbell, P. C. Physics of Plasmas, Vol. 26, Issue 7 https://doi.org/10.1063/1.5066231	journal	July 2019
Large time-varying inductance load for studying power flow on the Z machine Porwitzky, Andrew; Hutsel, Brian T.; Seagle, Christopher T. Physical Review Accelerators and Beams, Vol. 22, Issue 9 https://doi.org/10.1103/physrevaccelbeams.22.090401	journal	September 2019

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