Abstract
Three types of superconductors have been developed for the Large Helical Device (LHD). A composite-type superconductor with NbTi/Cu compacted strands and an aluminum/copper stabilizer has been developed for the pool-cooled helical coils with nominal currents of 13.0 and 17.3 kA for the Phase I and II operation conditions, respectively. The cryogenic stability of the conductor was improved by adopting a Cu–2% Ni clad around the pure aluminum to reduce Hall current generation. Cable-in-conduit superconductors have been developed for three pairs of force-cooled poloidal coils with nominal currents in Phase II of 20.8–31.3 kA. The strand surface is not coated and a stable DC performance was obtained. Another aluminum stabilized superconductor has been developed for the superconducting bus-lines. An R&D bus-line of 20 m length was successfully tested.
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