R. Heller et Jr. Hull, CONCEPTUAL DESIGN OF A 20-KA CURRENT LEAD USING FORCED-FLOW COOLING AND AG-ALLOY-SHEATHED BI-2223 HIGH-TEMPERATURE SUPERCONDUCTORS, IEEE transactions on applied superconductivity, 5(2), 1995, pp. 797-800
High-temperature superconductors (HTSs) consisting of Bi-2223 HTS tape
s sheathed with Ag alloys are proposed for a 20-kA current lead for th
e planned stellarator WENDELSTEIN 7-X. Forced-flow He cooling is used,
and 4-K He cooling of the whole lead, as well as 60-K He cooling of t
he copper part of the lead, is discussed. Power consumption and behavi
or in the event of loss of He flow are given.