DocumentCode :
790739
Title :
Al and W Wire Array Implosions and Energy Deposition on the 1-MA COBRA Generator
Author :
Kantsyrev, Victor L. ; Fedin, Dmitry A. ; Esaulov, Andrey A. ; Safronova, Alla S. ; Nalajala, Vidya ; Williamson, Kenneth ; Osborne, Glenn ; Yilmaz, M. Fatih ; Ouart, Nicholas D. ; Greenly, John B. ; Douglass, Jonathan D. ; McBride, Ryan D. ; Maxson, Lloy
Author_Institution :
Dept. of Phys., Nevada Univ., Reno, NV
Volume :
34
Issue :
5
fYear :
2006
Firstpage :
2288
Lastpage :
2294
Abstract :
Implosion characteristics of cylindrical arrays of aluminum (Al) or tungsten (W) wires with low number of wires were studied on the 1-MA 100-150-ns current rise time COBRA generator at Cornell University using X-ray/extreme ultraviolet detectors, time-gated cameras, spectrometers, and electrical diagnostics. Total radiation yields ET of 2.8 and 4.1 kJ were measured for Al and W, respectively. The yield above 0.75 keV for W arrays was lower than for Al. Al spectra imply Te of 250-280 eV. X-ray spectra in the 2-3-keV range from W arrays showed only very weak spectral lines. A relatively uniform precursor plasma column was observed on time-gated images in the initial implosion phase for both Al and W. Rapid radiation cooling of W plasmas after precursor plasma formation leads to a decrease of plasma Te before the stagnation phase of the implosion. No evidence of the increased energy deposition that could be associated with the single-shell or closed toroidal magnetic structures models was found
Keywords :
X-ray spectra; Z pinch; aluminium; arrays; exploding wires; plasma X-ray sources; plasma diagnostics; plasma production; plasma temperature; tungsten; 1 MA; 100 to 150 ns; 2.8 kJ; 4.1 kJ; Al; Al wire array implosions; COBRA generator; W; W wire array implosions; X-ray detectors; X-ray spectra; closed toroidal magnetic structures model; electrical diagnostics; energy deposition; extreme ultraviolet detectors; plasma temperature; precursor plasma formation; rapid radiation cooling; single-shell model; spectrometers; stagnation phase; time-gated cameras; total radiation yields; uniform precursor plasma column; weak spectral lines; Aluminum; Character generation; Plasma measurements; Plasma x-ray sources; Sensor arrays; Tungsten; Ultraviolet sources; Wire; X-ray detection; X-ray detectors; Wire arrays; X-ray imaging; X-ray source; X-ray spectroscopy;
fLanguage :
English
Journal_Title :
Plasma Science, IEEE Transactions on
Publisher :
ieee
ISSN :
0093-3813
Type :
jour
DOI :
10.1109/TPS.2006.883376
Filename :
1710116
Link To Document :
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