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

Abstract

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.

Authors:
 [1]; ORCiD logo [1];  [1];  [1]; ORCiD logo [1];  [1]
  1. Sandia National Lab. (SNL-NM), Albuquerque, NM (United States)
Publication Date:
Research Org.:
Sandia National Lab. (SNL-NM), Albuquerque, NM (United States)
Sponsoring Org.:
USDOE National Nuclear Security Administration (NNSA)
OSTI Identifier:
1464201
Report Number(s):
SAND-2018-0099J
Journal ID: ISSN 1070-664X; 666467
Grant/Contract Number:  
AC04-94AL85000
Resource Type:
Accepted Manuscript
Journal Name:
Physics of Plasmas
Additional Journal Information:
Journal Volume: 25; Journal Issue: 6; 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

Porwitzky, Andrew James, Dolan, D. H., Martin, Matthew R., Laity, George Russell, Lemke, R. W., and Mattsson, Thomas R. Direct measurements of anode/cathode gap plasma in cylindrically imploding loads on the Z machine. United States: N. p., 2018. Web. doi:10.1063/1.5026225.
Porwitzky, Andrew James, Dolan, D. H., Martin, Matthew R., Laity, George Russell, Lemke, R. W., & Mattsson, Thomas R. Direct measurements of anode/cathode gap plasma in cylindrically imploding loads on the Z machine. United States. doi:10.1063/1.5026225.
Porwitzky, Andrew James, Dolan, D. H., Martin, Matthew R., Laity, George Russell, Lemke, R. W., and Mattsson, Thomas R. Tue . "Direct measurements of anode/cathode gap plasma in cylindrically imploding loads on the Z machine". United States. doi:10.1063/1.5026225. https://www.osti.gov/servlets/purl/1464201.
@article{osti_1464201,
title = {Direct measurements of anode/cathode gap plasma in cylindrically imploding loads on the Z machine},
author = {Porwitzky, Andrew James and Dolan, D. H. and Martin, Matthew R. and Laity, George Russell and Lemke, R. W. and Mattsson, Thomas R.},
abstractNote = {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.},
doi = {10.1063/1.5026225},
journal = {Physics of Plasmas},
number = 6,
volume = 25,
place = {United States},
year = {2018},
month = {6}
}

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