DocumentCode :
962160
Title :
Quantitative Measurements of Wire Ablation in Tungsten X -pinches at 80 kA
Author :
Bott, Simon C. ; Haas, David M. ; Eshaq, Yossof ; Ueda, Utako ; Lebedev, Sergey V. ; Chittenden, Jeremy P. ; Palmer, James B A ; Bland, Simon N. ; Hall, Gareth N. ; Ampleford, David J. ; Beg, Farhat N.
Author_Institution :
Center for Energy Res., Univ. of California, La Jolla, CA
Volume :
36
Issue :
5
fYear :
2008
Firstpage :
2759
Lastpage :
2764
Abstract :
This paper investigates the ablation of wires in two-wire tungsten X -pinches driven by an 80-kA current over 50 ns. High-resolution imaging using a Nomarski interferometer allows measurements close to the X-pinch cross point, where the ablation ldquoflarerdquo structure is observed to clearly develop during the drive-current rise time. Electron density profiles are recovered as a function of both distance normal to the wire and of time. Results compare favorably to the rocket model of wire ablation. In addition, the density contrast over the ablation ldquostreamrdquo and ldquogaprdquo structure is measured and compared to similar measurements made using quantitative radiography on the 1-MA 250-ns MAGPIE generator at Imperial College London, London, U.K.
Keywords :
exploding wires; pinch effect; plasma density; plasma diagnostics; tungsten; Nomarski interferometer; W; current 80 kA; electron density profiles; exploding wire experiments; two-wire tungsten X -pinches; wire ablation; $X$-pinch; $X$-pinch; Precursor plasma; wire ablation;
fLanguage :
English
Journal_Title :
Plasma Science, IEEE Transactions on
Publisher :
ieee
ISSN :
0093-3813
Type :
jour
DOI :
10.1109/TPS.2008.2003964
Filename :
4657381
Link To Document :
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