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Title: Dynamics of Large and Small Scale Structures in the Plasma Column of Wire Array Z-pinches.

Abstract

Abstract not provided.

Authors:
; ; ; ; ; ; ; ;
Publication Date:
Research Org.:
Sandia National Lab. (SNL-NM), Albuquerque, NM (United States)
Sponsoring Org.:
USDOE National Nuclear Security Administration (NNSA)
OSTI Identifier:
1266975
Report Number(s):
SAND2007-0706C
524128
DOE Contract Number:
AC04-94AL85000
Resource Type:
Conference
Resource Relation:
Conference: Proposed for presentation at the 2007 Stewardship Science Academic Alliances Program Symposium held February 5-7, 2007 in Washington, DC.
Country of Publication:
United States
Language:
English

Citation Formats

Jones, Brent Manley, Ivanov, V. V., Sotnikov, V. I., Sarkisov, G. S., Cowan, T. E., Deeney, Christopher, Astanovitskiy, A. L., Laca, P., and Haboub, A. Dynamics of Large and Small Scale Structures in the Plasma Column of Wire Array Z-pinches.. United States: N. p., 2007. Web.
Jones, Brent Manley, Ivanov, V. V., Sotnikov, V. I., Sarkisov, G. S., Cowan, T. E., Deeney, Christopher, Astanovitskiy, A. L., Laca, P., & Haboub, A. Dynamics of Large and Small Scale Structures in the Plasma Column of Wire Array Z-pinches.. United States.
Jones, Brent Manley, Ivanov, V. V., Sotnikov, V. I., Sarkisov, G. S., Cowan, T. E., Deeney, Christopher, Astanovitskiy, A. L., Laca, P., and Haboub, A. Thu . "Dynamics of Large and Small Scale Structures in the Plasma Column of Wire Array Z-pinches.". United States. doi:. https://www.osti.gov/servlets/purl/1266975.
@article{osti_1266975,
title = {Dynamics of Large and Small Scale Structures in the Plasma Column of Wire Array Z-pinches.},
author = {Jones, Brent Manley and Ivanov, V. V. and Sotnikov, V. I. and Sarkisov, G. S. and Cowan, T. E. and Deeney, Christopher and Astanovitskiy, A. L. and Laca, P. and Haboub, A.},
abstractNote = {Abstract not provided.},
doi = {},
journal = {},
number = ,
volume = ,
place = {United States},
year = {Thu Feb 01 00:00:00 EST 2007},
month = {Thu Feb 01 00:00:00 EST 2007}
}

Conference:
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  • A series of experiments at the Z Accelerator was performed with 40mm and 50mm diameter nested wire arrays to investigate the interaction of the arrays and assess radiative characteristics. These arrays were fielded with one array as Al:Mg (either the inner or the outer array) and the other array as Ni-clad Ti (the outer or inner array, with respect to location of the Al:Mg). In all the arrays, the mass and radius ratio of the outer:inner was 2:1. The wire number ratio was also 2:1 in some cases, but the Al:Mg wire number was increased in some loads. This presentationmore » will focus on analysis of the emitted radiation (in multiple photon energy bins) and measured plasma conditions (as inferred from x-ray spectra). A discussion on what these results indicate about nested array dynamics will also be presented.« less
  • Exploding wire and wire array experiments have been carried out in Z-pinch and X-pinch geometry using low current (4.5kA amplitude, 1.4 {micro}s period damped sinusoid) and high current (up to 225 kA, 100 ns) drivers, X-ray backlighter images have been obtained using Mg, Al, Ti, Fe, Ni, NiCr, Cu, brass, Mo, Pd, Ag, Ta, W, Pt, Au, and Ni-coated Ti wires with initial diameters ranging from 7.5 {micro}m (W) to 46 {micro}m (Mg). There were typically two Mo X-pinch x-ray backlighters which generated pulses of <0.5 ns duration from sources small enough to allow resolution of {approximately}1 {micro}m scale structuremore » in the resulting images. In the high current experiments, images of dense cores within coronal plasmas are obtained with higher Z materials including Ni, Cu, Mo, Pd, Ta, W, Pt and Au; with lower Z materials, only the dense cores are visible in the backlighter images. In all cases a fine structure in the interior of the dense cores, and/or surface instabilities are observed. some of the dense cores show a shock-wave-like structure and others show gaps that open up more rapidly than the wire cores are expanding. The wire interiors develop a foam-like liquid-vapor mix, with some of the bubbles breaching the surface and spewing vapor out of the dense core. The low current experiments follow the same general behavior but require several {mu}s to complete the process instead of 50--100ns. With W and Al wire explosions, step wedges have been used to permit calibrated density measurements to be made of the core (W and Al) and coronal (W) plasmas. The two X-pinches have also been used to radiograph each other, yielding high resolution images of the on-axis collapsing z-pinch and minidiode formation at the X-pinch cross point very close to the time of x-ray burst emission.« less
  • Analysis of 50 mm diameter wire arrays at the Z Accelerator has shown experimentally the accretion of mass in a stagnating z pinch and provided insight into details of the radiating plasma species and plasma conditions. This analysis focused on nested wire arrays with a 2:1 (outeninner) mass, radius, and wire number ratio where Al wires were fielded on the outer array and Ni-clad Ti wires were fielded on the inner array.In this presentation, we will present analysis of data from other mixed Al/Ni-clad Ti configurations to further evaluate nested wire array dynamics and mass accretion. These additional configurations includemore » the opposite configuration to that described above (Ni-clad Ti wires on the outer array, with Al wires on the inner array) as well as higher wire number Al configurations fielded to vary the interaction of the two arrays. These same variations were also assessed for a smaller diameter nested array configuration (40 mm). Variations in the emitted radiation and plasma conditions will be presented, along with a discussion of what the results indicate about the nested array dynamics. Additional evidence for mass accretion will also be presented.« less
  • Abstract not provided.
  • Abstract not provided.