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Director: Ted Collings (Research Interests)
Assistant Director: Mike Sumption (Research Interests)
Overview of Operations
Work in the Applied Superconductivity and Magnetism Laboratories involves both fundamental as well as applied science. The current focus is on magnetic and electrical properties of materials. There are ongoing interactions with many university and national laboratories, both here and abroad, as well as with a number of companies. Current research in superconductivity includes both high Tc and low Tc superconductors, with specific areas of interest including; AC loss in accelerator cables, flux pinning, mechanical and electrical bridging, melt-quench processing of Nb3Al superconducing wires, S-N-S coupling, as well as various aspects of accelerator conductors. Work in magnetic materials has included the area of spin glasses, as well as industrial projects concerning processing and degradation of magnetic materials.
Some of the materials science topics that are found in the solution to problems of applied superconductivity are:
Phase Diagrams and Transformations (materials formation, precipitate formation).
Chemical Diffusion (materials formation, stabilizer and/or superconductor degradation), Heat diffusion (electromagnetic stability).
Mechanical alloying, and other materials fabrication techniques.
Strength of materials (Lorentz forces).
Resistivity: solid solution alloying, both magnetic and non-magnetic.
Grain boundary effects (Weak link problems, GB pinning).
Among other activities, our laboratory is concerned with:
The influence of materials properties (defects) on Josephson junctions.
Formation of metastable Nb3Al A15 phase.
Diffusion of macroscopic filamentary elements during reaction HT of Nb3Sn
Growth of mechanical interconnects (bridges) during Bi:based material HT
The influence of surface layers (especially RT oxidation of various plated and unplated surfaces) on surface resistance.
The influence of fabrication processes on grain alignment and properties in Bi-based materials.
Comparison of flux pinning due to materials defects in HTSC conductors.
The influence of a variety of strand and superconductor properties on the
AC loss" and magnetization characteristics of superconductor strands.
Activities: Measurement and Modeling.
Focus: Using materials science to solve applied problems in superconductivity.
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Other Web Sites of Interest
Lawrence Berkeley National Laboratories
The Department of Materials Science and Engineering at OSU
The Texas Center for Superconductivity at The University of Houston
IGC Advanced Superconductors
American Superconductor Corp
University of Twente Department of Applied Physics
National High Magnetic Field Laboratory
The Electrotechnical Institute
RHIC Project - Collider Ring Division
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