A laser shadowgraphy system for high-speed imaging of a convergent cylindrical shockwave generated by an electromagnetically 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 asymmetric 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 two-dimensional image fits for comparison. For the on-axis symmetric implosion shots, a radial trajectory plot is extracted and a radial shock velocity is calculated. The Lucite shock speed is seen to increase monotonically from an initial velocity of 7.9 mm/μs to a near final velocity of 13.4 mm/μs as convergence effects dominate the shock speed calculated at small radii.
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August 2001
Research Article|
August 01 2001
High speed laser shadowgraphy for electromagnetically driven cylindrical implosions
G. Rodriguez;
G. Rodriguez
MST-10, Mail Stop K764, Condensed Matter and Thermal Physics, Los Alamos National Laboratory, Los Alamos, New Mexico 87544
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J. P. Roberts;
J. P. Roberts
MST-10, Mail Stop K764, Condensed Matter and Thermal Physics, Los Alamos National Laboratory, Los Alamos, New Mexico 87544
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J. A. Echave;
J. A. Echave
MST-10, Mail Stop K764, Condensed Matter and Thermal Physics, Los Alamos National Laboratory, Los Alamos, New Mexico 87544
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A. J. Taylor
A. J. Taylor
MST-10, Mail Stop K764, Condensed Matter and Thermal Physics, Los Alamos National Laboratory, Los Alamos, New Mexico 87544
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Rev. Sci. Instrum. 72, 3230–3236 (2001)
Article history
Received:
March 19 2001
Accepted:
May 23 2001
Citation
G. Rodriguez, J. P. Roberts, J. A. Echave, A. J. Taylor; High speed laser shadowgraphy for electromagnetically driven cylindrical implosions. Rev. Sci. Instrum. 1 August 2001; 72 (8): 3230–3236. https://doi.org/10.1063/1.1386908
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