Superconducting System for the Large Helical Device. Toward the Accomplishment of the Superconducting Coil System for the Large Helical Device.

As the concluding chapter of this special issue regarding Large Helical Devices (LHD), the history of establishing the Superconducting coil concept for LHD is reviewed, and it is pointed that the present LHD coil designs are strongly guided and affected by the discussions and investigations made by the scientists and engineers from universities, institutes and industries of the country. A brief chronological description about finished construction is made, and the outlook of paths for remaining work before the first ignition of LHD were illustrated. Finally, the past and future research activities of the NIFS Superconducting group are introduced.