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Title: Radiative properties of high wire number tungsten arrays with implosion times up to 250 ns

Abstract

High wire number, 25-mm-diameter tungsten wire arrays have been imploded on the 8-MA Saturn generator [R. B. Spielman {ital et al.}, AIP Conference Proceeding 195, 3 (American Institute of Physics, Woodbury, NY 1989)], operating in a long-pulse mode. By varying the mass of the arrays from 710 to 6140 {mu}g/cm, implosion times of 130{endash}250 ns have been obtained with implosion velocities of 50{endash}25 cm/{mu}s, respectively. These {ital Z}-pinch implosions produced plasmas with millimeter diameters that radiated 600{endash}800 kJ of x-rays, with powers of 20{endash}49 TW; the corresponding pulsewidths were 19{endash}7.5 ns, with risetimes ranging from 6.5 to 4.0 ns. These powers and pulsewidths are similar to those achieved with 50-ns implosion times on Saturn. Two-dimensional, radiation-magnetohydrodynamic calculations indicate that the imploding shells in these long implosion time experiments are comparable in width to those in the short-pulse cases. This can be due to lower initial perturbations. A heuristic wire array model suggests that the reduced perturbations, in the long-pulse cases, may be due to the individual wire merger occurring well before the acceleration of the shell. The experiments and modeling suggest that 150{endash}200 ns implosion time {ital Z}-pinches could be employed for high-power, x-ray source applications. {copyright} {ital 1999 Americanmore » Institute of Physics.}« less

Authors:
; ; ; ; ; ; ;  [1]; ; ;  [2]
  1. Sandia National Laboratories, P.O. Box 5800, Albuquerque, New Mexico 87185 (United States)
  2. Plasma Physics Group, Imperial College London, SW7 2BZ (United Kingdom)
Publication Date:
OSTI Identifier:
362682
Resource Type:
Journal Article
Journal Name:
Physics of Plasmas
Additional Journal Information:
Journal Volume: 6; Journal Issue: 9; Other Information: PBD: Sep 1999
Country of Publication:
United States
Language:
English
Subject:
70 PLASMA PHYSICS AND FUSION; TUNGSTEN; IMPLOSIONS; X-RAY SOURCES; PINCH DEVICES; LINEAR Z PINCH DEVICES; EXPLODING WIRES; MAGNETOHYDRODYNAMICS; TWO-DIMENSIONAL CALCULATIONS; THERMONUCLEAR IGNITION

Citation Formats

Deeney, C., Coverdale, C.A., Douglas, M.R., Struve, K.W., Spielman, R.B., Stygar, W.A., Peterson, D.L., Roderick, N.F., Haines, M.G., Beg, F.N., and Ruiz-Camacho, J. Radiative properties of high wire number tungsten arrays with implosion times up to 250 ns. United States: N. p., 1999. Web. doi:10.1063/1.873617.
Deeney, C., Coverdale, C.A., Douglas, M.R., Struve, K.W., Spielman, R.B., Stygar, W.A., Peterson, D.L., Roderick, N.F., Haines, M.G., Beg, F.N., & Ruiz-Camacho, J. Radiative properties of high wire number tungsten arrays with implosion times up to 250 ns. United States. doi:10.1063/1.873617.
Deeney, C., Coverdale, C.A., Douglas, M.R., Struve, K.W., Spielman, R.B., Stygar, W.A., Peterson, D.L., Roderick, N.F., Haines, M.G., Beg, F.N., and Ruiz-Camacho, J. Wed . "Radiative properties of high wire number tungsten arrays with implosion times up to 250 ns". United States. doi:10.1063/1.873617.
@article{osti_362682,
title = {Radiative properties of high wire number tungsten arrays with implosion times up to 250 ns},
author = {Deeney, C. and Coverdale, C.A. and Douglas, M.R. and Struve, K.W. and Spielman, R.B. and Stygar, W.A. and Peterson, D.L. and Roderick, N.F. and Haines, M.G. and Beg, F.N. and Ruiz-Camacho, J.},
abstractNote = {High wire number, 25-mm-diameter tungsten wire arrays have been imploded on the 8-MA Saturn generator [R. B. Spielman {ital et al.}, AIP Conference Proceeding 195, 3 (American Institute of Physics, Woodbury, NY 1989)], operating in a long-pulse mode. By varying the mass of the arrays from 710 to 6140 {mu}g/cm, implosion times of 130{endash}250 ns have been obtained with implosion velocities of 50{endash}25 cm/{mu}s, respectively. These {ital Z}-pinch implosions produced plasmas with millimeter diameters that radiated 600{endash}800 kJ of x-rays, with powers of 20{endash}49 TW; the corresponding pulsewidths were 19{endash}7.5 ns, with risetimes ranging from 6.5 to 4.0 ns. These powers and pulsewidths are similar to those achieved with 50-ns implosion times on Saturn. Two-dimensional, radiation-magnetohydrodynamic calculations indicate that the imploding shells in these long implosion time experiments are comparable in width to those in the short-pulse cases. This can be due to lower initial perturbations. A heuristic wire array model suggests that the reduced perturbations, in the long-pulse cases, may be due to the individual wire merger occurring well before the acceleration of the shell. The experiments and modeling suggest that 150{endash}200 ns implosion time {ital Z}-pinches could be employed for high-power, x-ray source applications. {copyright} {ital 1999 American Institute of Physics.}},
doi = {10.1063/1.873617},
journal = {Physics of Plasmas},
number = 9,
volume = 6,
place = {United States},
year = {1999},
month = {9}
}