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Title: Wire Array Z-Pinch Insights for Enhanced X-Ray Production

Abstract

Comparisons of measured total radiated x-ray power from annular wire-array z-pinches with a variety of models as a function of wire number, array mass, and load radius are reviewed. The data, which are comprehensive, have provided important insights into the features of wire-array dynamics that are critical for high x-ray power generation. Collectively, the comparisons of the data with the model calculations suggest that a number of underlying dynamical mechanisms involving cylindrical asymmetries and plasma instabilities contribute to the measured characteristics. For example, under the general assumption that the measured risetime of the total-radiated-power pulse is related to the thickness of the plasma shell formed on axis, the Heuristic Model [IEEE Trans. Plasma Sci., 26, 1275 (1998)] agrees with the measured risetime under a number of specific assumptions about the way the breakdown of the wires, the wire-plasma expansion, and the Rayleigh-Taylor instability in the r-z plane, interact. Likewise, in the high wire-number regime (where the wires are calculated to form a plasma shell prior to significant radial motion of the shell) the comparisons show that the variation in the power of the radiation generated as a function of load mass and array radius can be simulated by the 2-Dmore » Eulerian-radiation-magnetohydrodynamics code (E-RMHC) [Phys. Plasmas 3, 368 (1996)], using a single random-density perturbation that seeds the Rayleigh-Taylor instability in the r-z plane. For a given pulse-power generator, the comparisons suggest that (1) the smallest interwire gaps compatible with practical load construction and (2) the minimum implosion time consistent with the optimum required energy coupling of the generator to the load should produce the highest total-radiated-power levels.« less

Authors:
; ; ; ; ; ; ; ; ; ; ;
Publication Date:
Research Org.:
Sandia National Laboratories, Albuquerque, NM (US)
Sponsoring Org.:
US Department of Energy (US)
OSTI Identifier:
2826
Report Number(s):
SAND98-1659C
TRN: US0101333
DOE Contract Number:  
AC04-94AL85000
Resource Type:
Conference
Resource Relation:
Conference: 40th Annual Meeting American Physical Society, New Orleans, LA (US), 11/16/1998--11/20/1998; Other Information: PBD: 4 Jan 1999
Country of Publication:
United States
Language:
English
Subject:
70 PLASMA PHYSICS AND FUSION TECHNOLOGY; LINEAR Z PINCH DEVICES; IMPLOSIONS; PLASMA INSTABILITY; X RADIATION; RAYLEIGH-TAYLOR INSTABILITY; POWER SYSTEMS

Citation Formats

Apruzese, J.P., Chittenden, J.P., Greenly, J.B., Haines, M.G., Mock, R.C., Mosher, D., Peterson, D.L., Reisman, D.B., Sanford, T.W.L., Sinars, D.B., Spielman, R.B., and Whitnery, K.G. Wire Array Z-Pinch Insights for Enhanced X-Ray Production. United States: N. p., 1999. Web.
Apruzese, J.P., Chittenden, J.P., Greenly, J.B., Haines, M.G., Mock, R.C., Mosher, D., Peterson, D.L., Reisman, D.B., Sanford, T.W.L., Sinars, D.B., Spielman, R.B., & Whitnery, K.G. Wire Array Z-Pinch Insights for Enhanced X-Ray Production. United States.
Apruzese, J.P., Chittenden, J.P., Greenly, J.B., Haines, M.G., Mock, R.C., Mosher, D., Peterson, D.L., Reisman, D.B., Sanford, T.W.L., Sinars, D.B., Spielman, R.B., and Whitnery, K.G. Mon . "Wire Array Z-Pinch Insights for Enhanced X-Ray Production". United States. https://www.osti.gov/servlets/purl/2826.
@article{osti_2826,
title = {Wire Array Z-Pinch Insights for Enhanced X-Ray Production},
author = {Apruzese, J.P. and Chittenden, J.P. and Greenly, J.B. and Haines, M.G. and Mock, R.C. and Mosher, D. and Peterson, D.L. and Reisman, D.B. and Sanford, T.W.L. and Sinars, D.B. and Spielman, R.B. and Whitnery, K.G.},
abstractNote = {Comparisons of measured total radiated x-ray power from annular wire-array z-pinches with a variety of models as a function of wire number, array mass, and load radius are reviewed. The data, which are comprehensive, have provided important insights into the features of wire-array dynamics that are critical for high x-ray power generation. Collectively, the comparisons of the data with the model calculations suggest that a number of underlying dynamical mechanisms involving cylindrical asymmetries and plasma instabilities contribute to the measured characteristics. For example, under the general assumption that the measured risetime of the total-radiated-power pulse is related to the thickness of the plasma shell formed on axis, the Heuristic Model [IEEE Trans. Plasma Sci., 26, 1275 (1998)] agrees with the measured risetime under a number of specific assumptions about the way the breakdown of the wires, the wire-plasma expansion, and the Rayleigh-Taylor instability in the r-z plane, interact. Likewise, in the high wire-number regime (where the wires are calculated to form a plasma shell prior to significant radial motion of the shell) the comparisons show that the variation in the power of the radiation generated as a function of load mass and array radius can be simulated by the 2-D Eulerian-radiation-magnetohydrodynamics code (E-RMHC) [Phys. Plasmas 3, 368 (1996)], using a single random-density perturbation that seeds the Rayleigh-Taylor instability in the r-z plane. For a given pulse-power generator, the comparisons suggest that (1) the smallest interwire gaps compatible with practical load construction and (2) the minimum implosion time consistent with the optimum required energy coupling of the generator to the load should produce the highest total-radiated-power levels.},
doi = {},
journal = {},
number = ,
volume = ,
place = {United States},
year = {1999},
month = {1}
}

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