Design and Fabrication of Superconducting Bus Lines

Abstract

A flexible superconducting (SC) bus line was developed as a current feeder system for an experimental fusion device, the Large Helical Device (LHD). An aluminum stabilized NbTi/Cu compacted strand cable was developed to satisfy the cryostable condition at a rated current of 32kA. A pair of SC cables was electrically insulated and installed in a cryogenic transfer line. Nine sets of SC bus lines with a total length of 497m have been installed in LHD. The SC current feeder system, including the stuctures of the SC bus line and both peripheral terminals, their cooling methods and their construction status are presented in this report.