NDLI: First fast Z-pinch current scaling experiments suggest faster radiated power dependence

Content Provider	IEEE Xplore Digital Library
Author	Mazarakis, M.G. Cuneo, M.E. Stygar, W.A. Sinars, D.B. Deeney, C. Struve, K.W. McDaniel, D.H. McGurn, J.S.
Copyright Year	2004
Description	Author affiliation: Sandia Nat. Lab., Albuquerque, NM, USA (Mazarakis, M.G.; Cuneo, M.E.; Stygar, W.A.; Sinars, D.B.; Deeney, C.; Struve, K.W.; McDaniel, D.H.; McGurn, J.S.)
Abstract	Summary form only given. In previous current-scaling experiments performed by William A. Stygar, the load masses were 5.8 mg for 90 kV charging of the Marx generators and 2.7 mg for 60 kV charging, resulting in implosion times of the order of 95 ns. The observed average peak radiated powers and energies were respectively 132TW and 1.625MJ for the 90-kV shots and 82.3TW and 0.841MJ for the 60-kV shots. The peak radiated X-ray power was proportional to the 1.24th power of the load current (P/spl prop/I/sup 1.24/), and the total radiated X-ray energy was proportional to the 1.73rd power of the load current (E/spl prop/I/sup 1.73/). In the present current scaling experiments the purpose is to look at current scaling of X-ray energy and power at shorter implosion times. The wire number (300), the array diameter (20 mm) and the height (1 cm) were the same as in previous studies. However the load masses were half the previous ones and equal to 2.5 and 1.25 mgr. This caused the arrays to pinch faster: /spl sim/80 ns into the current pulse. The power output at full charging of the Marx's (90 kV) and the standard 100 ns current drive of Z driver was quite high for a single 20-mm diameter W wire array and equal to 170TW. The total radiated energy was equal to 1.14MJ. We fired one shot at full 90 kV charge (Z/spl I.bar/1142) and a second one at 60 kV (Z/spl I.bar/1143). The pinches were of very high quality as witnessed by the output X-ray pulses and framing cameras. The FWHM of both shots were 3.9 ns and the rise times 2.5 and 3.1 ns. The peak load currents were respectively 16.45 and 11.09MA. The radiated power ratio is equal to the current ratio to the 1.88th power (P/spl prop/I/sup 1.88/) while the ratio of the total radiated energy is almost the same and equal to the 1.90th power of the current ratio (E/spl prop/I/sup 1.90/). Despite the fact that fast pinches do not use all the available Z driver energy and consequently deliver less total radiated X-ray energy, they however yield more radiated power and tighter stagnations than the slower, higher mass pinches. This may be most important for ICF loads. More shots are planned to further validate and confirm these scoping results.
Sponsorship	Plasma Sci. and Applications Committee of the IEEE Nuclear and Plasma Sci. Soc
File Size	72429
File Format	PDF
ISBN	0780383346
ISSN	07309244
DOI	10.1109/PLASMA.2004.1339605
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2004-07-01
Publisher Place	USA
Access Restriction	Subscribed
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Laboratories Wire Cameras US Department of Energy Contracts
Content Type	Text
Resource Type	Article
Subject	Atomic and Molecular Physics, and Optics Condensed Matter Physics Electrical and Electronic Engineering

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