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Title: Study of micro-pinches in wire-array Z pinches

Bright and hot areas with a high plasma density and temperature are observed in all kinds of Z pinches. We studied bright radiating spots produced by micro-pinches in cylindrical and planar wire-arrays at the 1 MA Zebra pulsed power generator using an x-ray streak camera synchronized with laser diagnostics, x-ray time-gated pinhole camera, and spectroscopy. Hot spots with extremely dense and relatively hot plasma arise during the collapse of the micro-pinches. These hot spots radiate a continuum spectrum with energy >2.5 keV. Typical micro-pinches in Al wire arrays generate x-ray bursts with durations of 0.4–1 ns in the soft x-ray range and 0.1–0.4 ns in the keV range. UV two-frame shadowgraphy shows spatial correlation of hot spots with the collapse and explosion of micro-pinches. Micro-pinches typically occur at the necks of the Z pinch, but can demonstrate a variety of parameters and different dynamics. An analysis of x-ray streak images shows that micro-pinches can generate >20% of the x-ray energy in some types of wire-array Z pinches.
Authors:
; ; ; ; ; ;  [1] ; ;  [2] ; ;  [3]
  1. Department of Physics, University of Nevada, Reno, Nevada 89557 (United States)
  2. Blackett Laboratory, Imperial College, London SW7 2BZ (United Kingdom)
  3. P.N. Lebedev Physical Institute, Moscow 119991 (Russian Federation)
Publication Date:
OSTI Identifier:
22218432
Resource Type:
Journal Article
Resource Relation:
Journal Name: Physics of Plasmas; Journal Volume: 20; Journal Issue: 11; Other Information: (c) 2013 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
70 PLASMA PHYSICS AND FUSION TECHNOLOGY; ALUMINIUM; CORRELATIONS; CYLINDRICAL CONFIGURATION; ELECTRON TEMPERATURE; HOT PLASMA; ION TEMPERATURE; KEV RANGE; LINEAR Z PINCH DEVICES; PLASMA DENSITY; PLASMA DIAGNOSTICS; SOFT X RADIATION; STREAK CAMERAS; WIRES; X-RAY SPECTROSCOPY