Friday, 2B-01, 8:30-8:45

A U.S. Perspective on the Challenges for Scale-up

Ken Marken

Superconductivity Technology Center, Los Alamos National Laboratory, Los Alamos, NM 87545
505-665-3030 phone,, 505-665-3164 fax, kmarken@lanl.gov

U.S. efforts to develop long, high performance coated conductors span a wide range of materials and process methods. While specific issues apply to particular materials and processes, there are also challenges common to all materials and processes. Some examples of common challenges include homogeneity of starting materials particularly metal for substrates, uniformity of substrate processing, stability and rate of deposition processes, and methods of continuous characterization. The homogeneity of substrate metal, including composition, chemical impurities, and surface roughness, directly impacts epitaxy and ultimately critical current. Stability of deposition processes, no matter what the method, is also crucial for consistent properties over long lengths. Related to stability of processing is the deposition rate, which directly impacts time scales over which the process must be controlled. In order to monitor and improve homogeneity, new and improved tools are needed to continuously monitor key parameters and provide feedback on the long length processing.

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