Abstract

The Large Helical Device (LHD) is a heliotron-type toroidal fusion experimental device which will provide useful and reliable data sets for high temperature plasmas with an equivalent Q value of 0.1–0.35. One of the crucial tasks of LHD is to demonstrate steady-state operations by taking the advantage of currentless plasmas. In this respect, the coil systems are fully superconducting (SC); consisting of a pair of helical coils, three pairs of poloidal coils and nine bus-lines, all of which are presently in the final stage of assembly. The helical coils and the Outer Vertical (OV) poloidal coils are the world largest SC coils among the existing fusion devices. The flexible SC bus-lines are one of the innovative components newly applied through this project. The technological development of the SC magnets took key roles in LHD.

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