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Title: Shock formation in Ne, Ar, Kr, and Xe on deuterium gas puff implosions

Abstract

1- and 2-D simulations of 1-cm radius, gas-puff liners of Ne, Ar, Kr, and Xe imploding onto a deuterium target are conducted using the discharge parameters for the Zebra (1 MA, 130 ns) driver using the resistive MHD code MACH2. This is an implementation of the Staged Z-pinch concept, in which the target is driven to high-energy-density first by shock compression launched by a diffused azimuthal magnetic field (J×B force), and then by the adiabatic compression as the liner converges on axis. During the run-in phase, the initial shock heating preheats the deuterium plasma, with a subsequent stable, adiabatic compression heating the target to high energy density. Shock compression of the target coincides with the development of a J×B force at the target/liner interface. Stronger B-field transport and earlier shock compression increases with higher-Z liners, which results in an earlier shock arrival on axis. As a result, delayed shock formation in lower-Z liners yields a relative increase in shock heating, however, the 2-D simulations show an increased target isolation from magneto-Rayleigh-Taylor instability penetration, suggesting that an optimal balance between these two effects is reached in an Ar or Kr liner, rather than with Xe.

Authors:
ORCiD logo [1];  [2];  [2];  [3];  [2];  [2]; ORCiD logo [1];  [1]
  1. Univ. of California, San Diego, La Jolla, CA (United States)
  2. Magneto-Inertial Fusion Technologies, Inc., Irvine, CA (United States)
  3. 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:
1340520
Report Number(s):
SAND-2016-9947J
Journal ID: ISSN 1070-664X; 648005; TRN: US1701073
Grant/Contract Number:  
AC04-94AL85000
Resource Type:
Journal Article: Accepted Manuscript
Journal Name:
Physics of Plasmas
Additional Journal Information:
Journal Volume: 23; Journal Issue: 12; 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

Narkis, J., Rahman, H. U., Ney, P., Desjarlais, M. P., Wessel, F. J., Conti, F., Valenzuela, J. C., and Beg, F. N. Shock formation in Ne, Ar, Kr, and Xe on deuterium gas puff implosions. United States: N. p., 2016. Web. doi:10.1063/1.4972547.
Narkis, J., Rahman, H. U., Ney, P., Desjarlais, M. P., Wessel, F. J., Conti, F., Valenzuela, J. C., & Beg, F. N. Shock formation in Ne, Ar, Kr, and Xe on deuterium gas puff implosions. United States. doi:10.1063/1.4972547.
Narkis, J., Rahman, H. U., Ney, P., Desjarlais, M. P., Wessel, F. J., Conti, F., Valenzuela, J. C., and Beg, F. N. Thu . "Shock formation in Ne, Ar, Kr, and Xe on deuterium gas puff implosions". United States. doi:10.1063/1.4972547. https://www.osti.gov/servlets/purl/1340520.
@article{osti_1340520,
title = {Shock formation in Ne, Ar, Kr, and Xe on deuterium gas puff implosions},
author = {Narkis, J. and Rahman, H. U. and Ney, P. and Desjarlais, M. P. and Wessel, F. J. and Conti, F. and Valenzuela, J. C. and Beg, F. N.},
abstractNote = {1- and 2-D simulations of 1-cm radius, gas-puff liners of Ne, Ar, Kr, and Xe imploding onto a deuterium target are conducted using the discharge parameters for the Zebra (1 MA, 130 ns) driver using the resistive MHD code MACH2. This is an implementation of the Staged Z-pinch concept, in which the target is driven to high-energy-density first by shock compression launched by a diffused azimuthal magnetic field (J×B force), and then by the adiabatic compression as the liner converges on axis. During the run-in phase, the initial shock heating preheats the deuterium plasma, with a subsequent stable, adiabatic compression heating the target to high energy density. Shock compression of the target coincides with the development of a J×B force at the target/liner interface. Stronger B-field transport and earlier shock compression increases with higher-Z liners, which results in an earlier shock arrival on axis. As a result, delayed shock formation in lower-Z liners yields a relative increase in shock heating, however, the 2-D simulations show an increased target isolation from magneto-Rayleigh-Taylor instability penetration, suggesting that an optimal balance between these two effects is reached in an Ar or Kr liner, rather than with Xe.},
doi = {10.1063/1.4972547},
journal = {Physics of Plasmas},
number = 12,
volume = 23,
place = {United States},
year = {Thu Dec 29 00:00:00 EST 2016},
month = {Thu Dec 29 00:00:00 EST 2016}
}

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Works referenced in this record:

Staged Z Pinch
journal, January 1995

  • Rahman, H. U.; Wessel, F. J.; Rostoker, N.
  • Physical Review Letters, Vol. 74, Issue 5, p. 714-717
  • DOI: 10.1103/PhysRevLett.74.714