NDLI: Initial results from the Wisconsin spherically convergent ion focus experiment

Content Provider	IEEE Xplore Digital Library
Author	Thorson, T.A. Durst, R.D. Fonck, R.J. Foucher, B.S. Wainwright, L.P.
Copyright Year	1995
Description	Author affiliation: Dept. of Nucl. Eng. & Eng. Phys., Wisconsin Univ., Madison, WI, USA (Thorson, T.A.; Durst, R.D.; Fonck, R.J.; Foucher, B.S.; Wainwright, L.P.)
Abstract	Summary form only given. The spherically convergent ion focus (SCIF) is an alternative plasma confinement scheme in which ions are electrostatically confined, accelerated, and concentrated at fusion-relevant energies. This concept has been recently promoted for various near-term applications including waste disposal, particle production, neutron radiography and tomography, plastic explosive detection, materials research, and medical isotope production. The Wisconsin SCIF experiments are designed to evaluate the practicality of the SCIF concept for given applications. In the experiment, a wire globe serves as a simple means of producing the trapping potential well, and the ion source consists of a cold, uniform plasma (n/sub i//spl sim/10/sup 14/ m/sup -1/) at the edge. Hydrogen ions formed from the background neutral gas (0.1-15 mtorr) are typically accelerated to energies of 5-20 kV, and measured cathode grid currents approach the space-charge limit for concentric spheres. Core size measurements utilize spectrally-filtered CCD camera images of the visible emission from the core region, and the minimal observed core radius of 0.6 cm (HWHM) is within a factor of 2-3 of the theoretical convergence ratio for the device. Neutral particle interactions and potential asymmetries imposed by the grid lead to non-ideal convergence, as evidenced by measured potential asymmetries and core size dependence on cathode grid spacing. Floating probes with 30 kV isolation have allowed unique measurements of the density, electric potential and temperature in the converged core.
File Size	102683
File Format	PDF
ISBN	0780326695
ISSN	07309244
DOI	10.1109/PLASMA.1995.533471
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	1995-06-05
Publisher Place	USA
Access Restriction	Subscribed
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Focusing Plasma confinement Acceleration Particle production Plasma measurements Cathodes Size measurement Convergence Waste disposal Neutrons
Content Type	Text
Resource Type	Article
Subject	Atomic and Molecular Physics, and Optics Condensed Matter Physics Electrical and Electronic Engineering

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