Definition: | production process of superconducting wires which starts with a number of nested tubes Note 1 to entry: A copper tube filled with Sn or Sn alloy bars is inserted into a Nb tube, which is inserted into another Cu tube. This forms an element of the composite. A number of elements are bundled and processed to form a thin wire followed by a heat treatment which forms a Nb3Sn layer on the inside of each Nb tube.
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