Numerical simulations of annular wire-array z-pinches in (x,y), (r,{theta}), and (r,z) geometries

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Description

The Total Immersion PIC (TIP) code has been used in several two-dimensional geometries to understand better the measured dynamics of annular, aluminum wire-array z-pinches. The areas investigated include the formation of the plasma sheath from current-induced individual wire explosions, the effects of wire number and symmetry on the implosion dynamics, and the dependence of the Rayleigh-Taylor instability growth on initial sheath thickness. A qualitative change in the dynamics with increasing wire number was observed, corresponding to a transition between a z-pinch composed of non-merging, self-pinching individual wires, and one characterized by the rapid formation and subsequent implosion of a continuous ... continued below

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25 p.

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Marder, B.M.; Sanford, T.W.L. & Allshouse, G.O. December 1, 1997.

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  • Sandia National Laboratories
    Publisher Info: Sandia National Labs., Albuquerque, NM (United States)
    Place of Publication: Albuquerque, New Mexico

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Description

The Total Immersion PIC (TIP) code has been used in several two-dimensional geometries to understand better the measured dynamics of annular, aluminum wire-array z-pinches. The areas investigated include the formation of the plasma sheath from current-induced individual wire explosions, the effects of wire number and symmetry on the implosion dynamics, and the dependence of the Rayleigh-Taylor instability growth on initial sheath thickness. A qualitative change in the dynamics with increasing wire number was observed, corresponding to a transition between a z-pinch composed of non-merging, self-pinching individual wires, and one characterized by the rapid formation and subsequent implosion of a continuous plasma sheath. A sharp increase in radiated power with increasing wire number has been observed experimentally near this calculated transition. Although two-dimensional codes have correctly simulated observed power pulse durations, there are indications that three dimensional effects are important in understanding the actual mechanism by which these pulse lengths are produced.

Physical Description

25 p.

Notes

INIS; OSTI as DE98002601

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  • Other Information: PBD: Dec 1997

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  • Other: DE98002601
  • Report No.: SAND--97-2725
  • Grant Number: AC04-94AL85000
  • DOI: 10.2172/564265 | External Link
  • Office of Scientific & Technical Information Report Number: 564265
  • Archival Resource Key: ark:/67531/metadc691988

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  • December 1, 1997

Added to The UNT Digital Library

  • Aug. 14, 2015, 8:43 a.m.

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  • April 13, 2016, 4:07 p.m.

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Marder, B.M.; Sanford, T.W.L. & Allshouse, G.O. Numerical simulations of annular wire-array z-pinches in (x,y), (r,{theta}), and (r,z) geometries, report, December 1, 1997; Albuquerque, New Mexico. (digital.library.unt.edu/ark:/67531/metadc691988/: accessed October 17, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.