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Title: Implosion dynamics of long-pulse wire array Z pinches

Abstract

Recent improvements in Z-pinch wire array load design at Sandia National Laboratories have led to a substantial increase in pinch performance as measured by radiated powers of up to 280 TW in 4 ns and 1.8 MJ of total radiated energy. Next generation, higher-current machines will allow for larger mass arrays and comparable or higher velocity implosions to be reached, possibly extending these results. As the current is pushed above 20 MA, a conventional machine design based on a 100 ns implosion time results in higher voltages, hence higher cost and power flow risk. Another approach, which shifts the risk to the load configuration, is to increase the implosion time to minimize the voltage. This approach is being investigated in a series of experimental campaigns on the Saturn [C. Deeney et al., Phys. Plasmas 6, 3576 (1999)] and Z [R. B. Spielman et al., Phys. Plasmas 5, 2105 (1998)] machines. In this paper, both experimental and two-dimensional computational modeling of the first long implosion time Z experiments will be presented. The experimental data shows broader pulses, lower powers, and larger pinch diameters compared to the corresponding short pulse data. By employing a nested array configuration, the pinch diameter was reducedmore » by 50% with a corresponding increase in power of >30%. Numerical simulations suggest that load velocity is the dominating mechanism behind these results. (c) 2000 American Institute of Physics.« less

Authors:
 [1];  [1];  [1];  [1];  [2];  [3]
  1. Sandia National Laboratory, Albuquerque, New Mexico 87185 (United States)
  2. University of New Mexico, Albuquerque, New Mexico 87102 (United States)
  3. Los Alamos National Laboratory, Los Alamos, New Mexico 87545 (United States)
Publication Date:
OSTI Identifier:
20216061
Resource Type:
Journal Article
Journal Name:
Physics of Plasmas
Additional Journal Information:
Journal Volume: 7; Journal Issue: 5; Other Information: PBD: May 2000; Journal ID: ISSN 1070-664X
Country of Publication:
United States
Language:
English
Subject:
70 PLASMA PHYSICS AND FUSION TECHNOLOGY; IMPLOSIONS; LINEAR Z PINCH DEVICES; DESIGN; PERFORMANCE; PLASMA SIMULATION; TWO-DIMENSIONAL CALCULATIONS; POWER; EXPLOSION WELDING; EXPLODING WIRES; EXPERIMENTAL DATA; THEORETICAL DATA

Citation Formats

Douglas, M. R., Deeney, C., Spielman, R. B., Coverdale, C. A., Roderick, N. F., and Peterson, D. L. Implosion dynamics of long-pulse wire array Z pinches. United States: N. p., 2000. Web. doi:10.1063/1.874018.
Douglas, M. R., Deeney, C., Spielman, R. B., Coverdale, C. A., Roderick, N. F., & Peterson, D. L. Implosion dynamics of long-pulse wire array Z pinches. United States. doi:10.1063/1.874018.
Douglas, M. R., Deeney, C., Spielman, R. B., Coverdale, C. A., Roderick, N. F., and Peterson, D. L. Mon . "Implosion dynamics of long-pulse wire array Z pinches". United States. doi:10.1063/1.874018.
@article{osti_20216061,
title = {Implosion dynamics of long-pulse wire array Z pinches},
author = {Douglas, M. R. and Deeney, C. and Spielman, R. B. and Coverdale, C. A. and Roderick, N. F. and Peterson, D. L.},
abstractNote = {Recent improvements in Z-pinch wire array load design at Sandia National Laboratories have led to a substantial increase in pinch performance as measured by radiated powers of up to 280 TW in 4 ns and 1.8 MJ of total radiated energy. Next generation, higher-current machines will allow for larger mass arrays and comparable or higher velocity implosions to be reached, possibly extending these results. As the current is pushed above 20 MA, a conventional machine design based on a 100 ns implosion time results in higher voltages, hence higher cost and power flow risk. Another approach, which shifts the risk to the load configuration, is to increase the implosion time to minimize the voltage. This approach is being investigated in a series of experimental campaigns on the Saturn [C. Deeney et al., Phys. Plasmas 6, 3576 (1999)] and Z [R. B. Spielman et al., Phys. Plasmas 5, 2105 (1998)] machines. In this paper, both experimental and two-dimensional computational modeling of the first long implosion time Z experiments will be presented. The experimental data shows broader pulses, lower powers, and larger pinch diameters compared to the corresponding short pulse data. By employing a nested array configuration, the pinch diameter was reduced by 50% with a corresponding increase in power of >30%. Numerical simulations suggest that load velocity is the dominating mechanism behind these results. (c) 2000 American Institute of Physics.},
doi = {10.1063/1.874018},
journal = {Physics of Plasmas},
issn = {1070-664X},
number = 5,
volume = 7,
place = {United States},
year = {2000},
month = {5}
}