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Title: Wire dynamics model of the implosion of nested and planar wire arrays

Abstract

This paper presents the wire dynamics model (WDM), which can effectively replace the generic 0D (zero-dimensional) model in simulation of the implosions of arbitrary shaped wire arrays, including high-wire-number nested and planar array loads at multi-MA generators. Fast and inexpensive WDM modeling can predict the array implosion time and the rate of thermalization of the kinetic energy, and can estimate the timing of the x-ray pulse. Besides serving the purposes of the design and optimization of the wire array loads of complex configurations, the WDM reproduces the specific features of the wire array implosion dynamics due to the inductive current transfer, which makes the WDM a valuable amplification of the magnetohydrodynamic models.

Authors:
; ; ; ;  [1];  [2];  [2];  [2]
  1. Department of Physics, University of Nevada, Reno, Nevada 89557 (United States)
  2. (United States)
Publication Date:
OSTI Identifier:
20860415
Resource Type:
Journal Article
Resource Relation:
Journal Name: Physics of Plasmas; Journal Volume: 13; Journal Issue: 12; Other Information: DOI: 10.1063/1.2402147; (c) 2006 American Institute of Physics; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
70 PLASMA PHYSICS AND FUSION TECHNOLOGY; AMPLIFICATION; DESIGN; EXPLODING WIRES; ICF DEVICES; IMPLOSIONS; INERTIAL CONFINEMENT; KINETIC ENERGY; MAGNETOHYDRODYNAMICS; OPTIMIZATION; PLASMA; PLASMA SIMULATION; PULSES; RADIATION TRANSPORT; THERMALIZATION; X RADIATION; X-RAY SOURCES

Citation Formats

Esaulov, A. A., Velikovich, A. L., Kantsyrev, V. L., Mehlhorn, T. A., Cuneo, M. E., Plasma Physics Division, Naval Research Laboratory, Washington, D.C. 20375, Department of Physics, University of Nevada, Reno, Nevada 89557, and Sandia National Laboratories, Albuquerque, New Mexico 87185. Wire dynamics model of the implosion of nested and planar wire arrays. United States: N. p., 2006. Web. doi:10.1063/1.2402147.
Esaulov, A. A., Velikovich, A. L., Kantsyrev, V. L., Mehlhorn, T. A., Cuneo, M. E., Plasma Physics Division, Naval Research Laboratory, Washington, D.C. 20375, Department of Physics, University of Nevada, Reno, Nevada 89557, & Sandia National Laboratories, Albuquerque, New Mexico 87185. Wire dynamics model of the implosion of nested and planar wire arrays. United States. doi:10.1063/1.2402147.
Esaulov, A. A., Velikovich, A. L., Kantsyrev, V. L., Mehlhorn, T. A., Cuneo, M. E., Plasma Physics Division, Naval Research Laboratory, Washington, D.C. 20375, Department of Physics, University of Nevada, Reno, Nevada 89557, and Sandia National Laboratories, Albuquerque, New Mexico 87185. Fri . "Wire dynamics model of the implosion of nested and planar wire arrays". United States. doi:10.1063/1.2402147.
@article{osti_20860415,
title = {Wire dynamics model of the implosion of nested and planar wire arrays},
author = {Esaulov, A. A. and Velikovich, A. L. and Kantsyrev, V. L. and Mehlhorn, T. A. and Cuneo, M. E. and Plasma Physics Division, Naval Research Laboratory, Washington, D.C. 20375 and Department of Physics, University of Nevada, Reno, Nevada 89557 and Sandia National Laboratories, Albuquerque, New Mexico 87185},
abstractNote = {This paper presents the wire dynamics model (WDM), which can effectively replace the generic 0D (zero-dimensional) model in simulation of the implosions of arbitrary shaped wire arrays, including high-wire-number nested and planar array loads at multi-MA generators. Fast and inexpensive WDM modeling can predict the array implosion time and the rate of thermalization of the kinetic energy, and can estimate the timing of the x-ray pulse. Besides serving the purposes of the design and optimization of the wire array loads of complex configurations, the WDM reproduces the specific features of the wire array implosion dynamics due to the inductive current transfer, which makes the WDM a valuable amplification of the magnetohydrodynamic models.},
doi = {10.1063/1.2402147},
journal = {Physics of Plasmas},
number = 12,
volume = 13,
place = {United States},
year = {Fri Dec 15 00:00:00 EST 2006},
month = {Fri Dec 15 00:00:00 EST 2006}
}
  • No abstract prepared.
  • Low wire number nested array Z-pinch experiments have been carried out with wires made of aluminum, stainless steel (uniform), and combinations of these two materials (mixed) on the 1 MA COBRA generator at Cornell University [J. D. Douglass, J. B. Greenly, D. A. Hammer et al., in Proceedings of the 15th IEEE International Pulsed Power Conference (IEEE, Piscataway, NJ, 2005)]. The outer array consisted of eight wires, whereas the inner array had four or eight wires. The 10 {mu}m Al wires were alloy 5056 and the 6.25 {mu}m stainless steel wires were alloy SS304. The diagnostic suite included fast-x-ray andmore » extreme ultraviolet (EUV) detectors, a time-gated x-ray pinhole camera, x-ray spectrometers, and laser shadow imaging. The main focus was made on the spectroscopic study of plasma evolution after the main x-ray burst though the data from photoconducting detector (PCD) and EUV signals over the whole period of current, and in addition laser shadowgraphy images before the main x-ray burst were analyzed. Modeling of the time-gated spectra recorded after the main x-ray burst indicates that the electron temperature Te either follows the PCD signals and peaks at times of the second (and the third if present) x-ray burst or has the higher value at the first frame (closest to the main x-ray burst), then slightly changes and increases at the last frame, which coincides with the second maximum of the current. It was also found that the values of Te never drop below 150 eV, and the EUV signal remains intense even when the PCD signal is almost zero.« less
  • The results of experiments with combined aluminum (Al) and stainless steel (SS) alloy 304, nested wire arrays from the 1 MA COBRA generator at Cornell University are presented. The loads studied consisted of a 6 mm diameter inner array and a 13 mm diameter outer array with a different material in each array: SS or aluminum. Al implodes before SS in all loads studied, even when Al was on the inner array. The new wire ablation dynamic model and spectroscopic modeling are used to interpret these data. The observed implosion dynamics are likely a result of the higher ablation ratemore » of Al. These initial results suggest that combining wire materials with different ablation rates in wire array loads could be developed into a useful technique for x-ray pulse shaping and radiation yield optimization.« less
  • A set of microsecond implosion experiments was carried on the GIT-12 generator to study the radiative performance of Al planar wire arrays. The load parameters such as a wire diameter, a gap between the wires, the number of wires, and the total planar wire mass and width were varied during the experiments, however the implosion time and the peak implosion current were almost the same for all load configurations. This ensured equal energy deposition to the plasma due to kinetic mechanisms for all load configurations. Two implosion regimes with the implosion times of 1050 ns and 850 ns were investigated.more » The experimental data on the K-shell radiation yield and power at varying load parameters are presented.« less
  • Abstract not provided.