NDLI: Surface current density distribution measurements of an electrically exploded foil VIA B-DOT probe array data inversion

Content Provider	IEEE Xplore Digital Library
Author	Ruden, E.L. Amdahl, D.J. Cooksey, R.H. Robinson, P.R. Analla, F.T. Brown, D.J. Kostora, M.R. Camacho, J.F. Makhin, V.
Copyright Year	2015
Description	Author affiliation: Directed Energy Directorate, Air Force Res. Lab., Kirtland AFB, NM, USA (Ruden, E.L.; Amdahl, D.J.; Cooksey, R.H.; Robinson, P.R.) \|\| TechFlow Inc., Albuquerque, NM, USA (Makhin, V.) \|\| Leidos Eng., Inc., Albuquerque, NM, USA (Analla, F.T.; Brown, D.J.; Kostora, M.R.; Camacho, J.F.)
Abstract	Measurements are presented of the current per unit length as a function of the transverse distance from the center of a water-tamped 80 μm Al foil that narrows to a central width of 15.2 cm as it explodes into warm dense matter by Ohmic heating. Current is delivered from a 36 μF capacitor bank charged to 30 kV and discharged to a peak current of 342 kA in 2.0 μs. The distribution is calculated by the linear regularized inversion of signals from an array of B-dot probes distributed long the foil's central half-width. The probes are far enough away from the foil (1 cm) to be noninvasive and mechanically undisturbed during the time of interest. These results are compared to 3-D MHD ALEGRA simulations of the geometry externally coupled to a two-loop lumped circuit model representing the driver. Current is strongly peaked at the foil edges for low-current calibration tests, where conductivity is essentially constant. It's broadly peaked in the center at peak current for the full energy shot, though, due to the foil fusing first at the edges, which subsequently reduces current there relative to the center by the time of peak current. There is broad agreement in this regard between the experiment and ALEGRA using thermal and electrical conductivity model SNL Sesame 293731. ALEGRA peaks 0.5 μs earlier, though, and with 50 kA higher current. This may be due to error in the conductivity tables or effects not well-modeled, such as an electro-thermal instability that results in higher total resistance, but with a distance scale too small for the present simulation to represent.
Starting Page	1
Ending Page	6
File Size	3576165
Page Count	6
File Format	PDF
e-ISBN	9781479984039
DOI	10.1109/PPC.2015.7297013
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2015-05-31
Publisher Place	USA
Access Restriction	Subscribed
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Fuses Probes Current density Calibration Integrated circuit modeling Wires
Content Type	Text
Resource Type	Article

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