NDLI: Implosion dynamics and radiation output of wire-array z-pinches on the cobra pulsed-power generator

Content Provider	IEEE Xplore Digital Library
Author	McBride, R.D. Shelkovenko, T.A. Pikuz, S.A. Hammer, D.A. Greenly, J.B. Kusse, B.R. Douglass, J.D. Knapp, P.F. Bell, K.S. Blesener, I.C. Chalenski, D.A.
Copyright Year	2008
Description	Author affiliation: Lab. of Plasma Studies, Cornell Univ., Ithaca, NY (McBride, R.D.; Shelkovenko, T.A.; Pikuz, S.A.; Hammer, D.A.; Greenly, J.B.; Kusse, B.R.; Douglass, J.D.; Knapp, P.F.; Bell, K.S.; Blesener, I.C.; Chalenski, D.A.)
Abstract	Experimental results are presented which characterize the implosion dynamics and subsequent radiation output of wire-array Z-pinches on the 1-MA, 100-ns rise-time COBRA pulsed-power generator. Diagnostics fielded include an optical streak camera, a time-gated XUV framing camera, a laser shadowgraph system, filtered time-integrated pinhole cameras, an X-ray focusing spectrometer with spatial resolution (FSSR), a load voltage monitor, a Faraday cup, a bolometer, silicon diodes and diamond photoconducting detectors (PCDs). The load geometries investigated include hollow cylindrical arrays ranging from 4 to 16 mm in diameter, and consisting of 8, 16, or 32 wires of either tungsten (W), aluminum (Al), or Invar. The data produced by the entire suite of diagnostics are analyzed and presented to provide an overall picture of implosion dynamics and timing on COBRA. In particular, data fitting to various implosion trajectory models, as well as X-ray pulse shape dependencies on various loads and implosion characteristics are presented and discussed. From this study, it was determined that by moving the stagnation time earlier (i.e., before the peak in the driving load current, where dI/dt is positive), the total X-ray yield is increased by ~1.5-2times on COBRA. From bolometer measurements, we recorded ~10 kJ of total X-ray energy, which is a conversion efficiency of -10% for the 100-kJ discharge of a typical COBRA pulse. Load scaling for an earlier stagnation time was accomplished by dropping to a smaller initial array diameter (i.e., 4 mm) and using smaller initial wire diameters (i.e., 5-mum W; 12-mum Al). The use of fine wire and a small array diameter also allowed for enough wires and a tight enough wire-spacing to provide good implosion uniformity (i.e., 16 wires on a 4-mm array diameter for 785-mum wire spacing).
Starting Page	1
Ending Page	1
File Size	62879
Page Count	1
File Format	PDF
ISBN	9781424419296
ISSN	07309244
DOI	10.1109/PLASMA.2008.4591079
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2008-06-15
Publisher Place	Germany
Access Restriction	Subscribed
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Laboratories Generators Plasmas
Content Type	Text
Resource Type	Article
Subject	Atomic and Molecular Physics, and Optics Condensed Matter Physics Electrical and Electronic Engineering

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