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Title: Computational analysis of current-loss mechanisms in a post-hole convolute driven by magnetically insulated transmission lines

Abstract

Numerical simulations of a vacuum post-hole convolute driven by magnetically insulated vacuum transmission lines (MITLs) are used to study current losses due to charged particle emission from the MITL-convolute-system electrodes. This work builds on the results of a previous study [E.A. Madrid et al. Phys. Rev. ST Accel. Beams 16, 120401 (2013)] and adds realistic power pulses, Ohmic heating of anode surfaces, and a model for the formation and evolution of cathode plasmas. The simulations suggest that modestly larger anode-cathode gaps in the MITLs upstream of the convolute result in significantly less current loss. In addition, longer pulse durations lead to somewhat greater current loss due to cathode-plasma expansion. These results can be applied to the design of future MITL-convolute systems for high-current pulsed-power systems.

Authors:
; ; ; ; ; ;
Publication Date:
Research Org.:
Sandia National Lab. (SNL-NM), Albuquerque, NM (United States)
Sponsoring Org.:
USDOE National Nuclear Security Administration (NNSA)
OSTI Identifier:
1181481
Alternate Identifier(s):
OSTI ID: 1214811
Grant/Contract Number:  
AC04-94AL85000
Resource Type:
Published Article
Journal Name:
Physical Review Special Topics. Accelerators and Beams
Additional Journal Information:
Journal Name: Physical Review Special Topics. Accelerators and Beams Journal Volume: 18 Journal Issue: 3; Journal ID: ISSN 1098-4402
Publisher:
American Physical Society
Country of Publication:
United States
Language:
English
Subject:
42 ENGINEERING

Citation Formats

Rose, D. V., Madrid, E. A., Welch, D. R., Clark, R. E., Mostrom, C. B., Stygar, W. A., and Cuneo, M. E. Computational analysis of current-loss mechanisms in a post-hole convolute driven by magnetically insulated transmission lines. United States: N. p., 2015. Web. doi:10.1103/PhysRevSTAB.18.030402.
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Rose, D. V., Madrid, E. A., Welch, D. R., Clark, R. E., Mostrom, C. B., Stygar, W. A., & Cuneo, M. E. Computational analysis of current-loss mechanisms in a post-hole convolute driven by magnetically insulated transmission lines. United States. https://doi.org/10.1103/PhysRevSTAB.18.030402
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Rose, D. V., Madrid, E. A., Welch, D. R., Clark, R. E., Mostrom, C. B., Stygar, W. A., and Cuneo, M. E. Wed . "Computational analysis of current-loss mechanisms in a post-hole convolute driven by magnetically insulated transmission lines". United States. https://doi.org/10.1103/PhysRevSTAB.18.030402.
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@article{osti_1181481,
title = {Computational analysis of current-loss mechanisms in a post-hole convolute driven by magnetically insulated transmission lines},
author = {Rose, D. V. and Madrid, E. A. and Welch, D. R. and Clark, R. E. and Mostrom, C. B. and Stygar, W. A. and Cuneo, M. E.},
abstractNote = {Numerical simulations of a vacuum post-hole convolute driven by magnetically insulated vacuum transmission lines (MITLs) are used to study current losses due to charged particle emission from the MITL-convolute-system electrodes. This work builds on the results of a previous study [E.A. Madrid et al. Phys. Rev. ST Accel. Beams 16, 120401 (2013)] and adds realistic power pulses, Ohmic heating of anode surfaces, and a model for the formation and evolution of cathode plasmas. The simulations suggest that modestly larger anode-cathode gaps in the MITLs upstream of the convolute result in significantly less current loss. In addition, longer pulse durations lead to somewhat greater current loss due to cathode-plasma expansion. These results can be applied to the design of future MITL-convolute systems for high-current pulsed-power systems.},
doi = {10.1103/PhysRevSTAB.18.030402},
journal = {Physical Review Special Topics. Accelerators and Beams},
number = 3,
volume = 18,
place = {United States},
year = {Wed Mar 04 00:00:00 EST 2015},
month = {Wed Mar 04 00:00:00 EST 2015}
}
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Publisher's Version of Record
https://doi.org/10.1103/PhysRevSTAB.18.030402
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