Multiple-Core Straight Conductors
As already indicated, combined materials with internal stabilization are manufactured in the form of multiple-core conductors, since the production and use of a single-core superconducting wire involves serious difficulties. The number of individual superconducting strands in the conductor may vary from 10–20 to several hundreds or even thousands. In addition to this the combined conductor contains normal metal; this is either a pure metal with a high electrical conductivity (usually copper) or an alloy with a relatively low conductivity (such as a copper—nickel alloy of the constantan type). Sometimes conductors containing all three components are made . The combined conductor may also be a cable twisted from individual wires consisting of superconducting strands in a common sheath of normal metal.
KeywordsThermal Resistance Normal Metal Super Conducting Copper Matrix Superconducting Layer
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