NDLI: Development and fielding of high-speed laser shadowgraphy for electro-magnetically driven cylindrical implosions

Content Provider	IEEE Xplore Digital Library
Author	Roberts, J.P. Rodriguez, G. Echave, J.A. Taylor, A.J.
Copyright Year	2001
Description	Author affiliation: Los Alamos Nat. Lab., NM, USA (Roberts, J.P.; Rodriguez, G.; Echave, J.A.; Taylor, A.J.)
Abstract	A laser shadowgraphy system for high-speed imaging of a convergent cylindrical shockwave generated by an electro-magnetically driven solid density liner implosion in Lucite is described. The laser shadowgraphy system utilizes an advanced high-energy, long-pulse, frequency-doubled Nd:YAG laser for target illumination and a fast framing camera for multiple frame imaging of the shockwave as it radially converges and transits the Lucite. The time window resolution is 10 ns as determined by the fastest exposure time capable with the camera. Two on-axis symmetric implosions and two off-axis antisymmetric implosion experiments were fielded at the Air Force Research Laboratory's Shiva Star 4.2 MJ capacitor bank z-pinch facility. For each experimental shot, the shadowgraphy system captured several frames of shadowgraph images as the shockwave moved through the Lucite. Analysis of the shockwave shadowgraph image shapes is done by fitting each shadowgraph image to a generic elliptical fit function and plotting the resultant 2-D image fits for comparison. For the on-axis symmetric implosion shots, a radial shock velocity is calculated. The Lucite shock speed is seen to increase monotonically from an initial velocity of 7.9 mm//spl mu/s to a near final velocity of 13.4 mm//spl mu/s as convergence effects dominate the shock speed calculated at small radii.
Sponsorship	Plasma Sci. & Appl. Committee Pulsed Power Sci. & Technol. Committee of the IEEE Nucl. & Plasma Sci. Soc
Starting Page	368
Ending Page	371
File Size	433932
Page Count	4
File Format	PDF
ISBN	0780371208
DOI	10.1109/PPPS.2001.1002069
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2001-06-17
Publisher Place	USA
Access Restriction	Subscribed
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Electric shock Cameras Solid lasers Frequency Lighting High-resolution imaging Laboratories Capacitors Image analysis Shape
Content Type	Text
Resource Type	Article

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