Uniformity of cylindrical imploding underwater shockwaves at very small radii
File(s)
Accepted version
Author(s)
Yanuka, D
Rososhek, A
Bland, SN
Krasik, Ya E
Type
Journal Article
Abstract
We compare the convergent shockwaves generated from underwater, cylindrical arrays of copper
wire exploded by multiple kilo-ampere current pulses on nanosecond and microsecond scales. In
both cases, the pulsed power devices used for the experiments had the same stored energy (
500 J)
and the wire mass was adjusted to optimize energy transfer to the shockwave. Laser backlit framing
images of the shock front were achieved down to the radius of 30
l
m. It was found that even in the
case of initial azimuthal non-symmetry, the shock wave self-repairs in the final stages of its motion,
leading to a highly uniform implosion. In both these and previous experiments, interference fringes
have been observed in streak and framing images as the shockwave approached the axis. We have
been able to accurately model the origin of the fringes, which is due to the propagation of the laser
beam diffracting off the uniform converging shock front. The dynamics of the shockwave and its
uniformity at small radii indicate that even with only 500 J stored energies, this technique should
produce pressures above 10¹⁰
Pa on the axis, with temperatures and densities ideal for warm dense
matter research.
wire exploded by multiple kilo-ampere current pulses on nanosecond and microsecond scales. In
both cases, the pulsed power devices used for the experiments had the same stored energy (
500 J)
and the wire mass was adjusted to optimize energy transfer to the shockwave. Laser backlit framing
images of the shock front were achieved down to the radius of 30
l
m. It was found that even in the
case of initial azimuthal non-symmetry, the shock wave self-repairs in the final stages of its motion,
leading to a highly uniform implosion. In both these and previous experiments, interference fringes
have been observed in streak and framing images as the shockwave approached the axis. We have
been able to accurately model the origin of the fringes, which is due to the propagation of the laser
beam diffracting off the uniform converging shock front. The dynamics of the shockwave and its
uniformity at small radii indicate that even with only 500 J stored energies, this technique should
produce pressures above 10¹⁰
Pa on the axis, with temperatures and densities ideal for warm dense
matter research.
Date Issued
2017-11-21
Date Acceptance
2017-11-06
Citation
Applied Physics Letters, 2017, 111 (21)
ISSN
1077-3118
Publisher
AIP Publishing
Journal / Book Title
Applied Physics Letters
Volume
111
Issue
21
Copyright Statement
© 2017 The Author(s). Published by AIP Publishing. This article may be downloaded for personal use only. Any other use requires prior permission of the author and the American Institute of Physics. The following article may be found at http://aip.scitation.org/doi/10.1063/1.5005174
Identifier
http://gateway.webofknowledge.com/gateway/Gateway.cgi?GWVersion=2&SrcApp=PARTNER_APP&SrcAuth=LinksAMR&KeyUT=WOS:000416008000039&DestLinkType=FullRecord&DestApp=ALL_WOS&UsrCustomerID=1ba7043ffcc86c417c072aa74d649202
Subjects
Science & Technology
Physical Sciences
Physics, Applied
Physics
EQUATION-OF-STATE
SHOCKS
Publication Status
Published
Article Number
ARTN 214103