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3,579 Matching Results

Start Over Year 1986 Day 1st Language English

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Zeeman Laser Scattering (ZLS): a new light scattering technique (open access)

Zeeman Laser Scattering (ZLS): a new light scattering technique

A new light scattering technique, called Zeeman Laser Scattering (ZLS), which uses a two-frequency Zeeman effect laser, is described. The Zeeman effect laser produces two coherent, colinear laser beams having orthogonal polarizations. The laser output is passed unfocused through a scattering cell containing the sample of interest, and the light scattered at each scattering angle is detected with a photomultiplier tube mounted on an arm that rotates under computer control about the scattering cell. The phase and amplitude of the beats produced by the interference of the two colinear laser beams are measured. Three different scattering mechanisms to which ZLS is sensitive are described, and the quantitative theory of ZLS is derived from the scattering amplitude matrix formalism. Samples of ZLS data are given. (LEW)
Date: January 1, 1986
Creator: Johnston, Roger G.; Singham, Shermila B. & Salzman, Gary C.
Object Type: Article
System: The UNT Digital Library
Zone approaches to international safeguards of a nuclear fuel cycle (open access)

Zone approaches to international safeguards of a nuclear fuel cycle

At present the IAEA designs its safeguards approach with regard to each type of nuclear facility so that the safeguards activities and effort are essentially the same for a given type and size of nuclear facility wherever it may be located. Conclusions regarding a state are derived by combining the results of safeguards verifications for the individual facilities within it. We have examined safeguards approaches for a state nuclear fuel cycle that take into account the existence of all of the nuclear facilities in the state. We have focussed on the fresh-fuel zone of an advanced nuclear fuel cycle, the several facilities of which use or process low-enriched uranium. At one extreme, flows and inventories would be verified at each material balance area. At the other extreme, the flows into and out of the zone and the inventory of the whole zone would be verified. The intention is to develop an approach which will make it possible to compare the technical effectiveness and the inspection effort for the facility-oriented approach, for the zone approach and for some reasonable intermediate safeguards approaches. Technical effectiveness, in these cases, means an estimate of the assurance that all nuclear material has been accounted for.
Date: January 1, 1986
Creator: Fishbone, L.G. & Higinbotham, W.A.
Object Type: Article
System: The UNT Digital Library
ZT-P: an advanced air core reversed field pinch prototype (open access)

ZT-P: an advanced air core reversed field pinch prototype

The ZT-P experiment, with a major radius of 0.45 m and a minor radius of 0.07 m, was designed to prototype the next generation of reversed field pinch (RFP) machines at Los Alamos. ZT-P utilizes an air-core poloidal field system, with precisely wound and positioned rigid copper coils, to drive the plasma current and provide plasma equilibrium with intrinsically low magnetic field errors. ZT-P's compact configuration is adaptable to test various first wall and limiter designs at reactor-relevant current densities in the range of 5 to 20 MA/m/sup 2/. In addition, the load assembly design allows for the installation of toroidal field divertors. Design of ZT-P began in October 1983, and assembly was completed in October 1984. This report describes the magnetic, electrical, mechanical, vacuum, diagnostic, data acquisition, and control aspects of the machine design. In addition, preliminary data from initial ZT-P operation are presented. Because of ZT-P's prototypical function, many of its design aspects and experimental results are directly applicable to the design of a next generation RFP. 17 refs., 47 figs.
Date: January 1, 1986
Creator: Schoenberg, K. F.; Buchenauer, C. J.; Burkhardt, L. C.; Caudill, L. D.; Dike, R. S.; Dominguez, T. et al.
Object Type: Report
System: The UNT Digital Library