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Study on Wind-React-Transfer Method for Helical Coils Wound from Nb₃Sn Cable-in-Conduit Conductors

Shinsaku IMAGAWA^1,2)

1)

National Institute for Fusion Science, NINS, 322-6 Oroshi, Toki, Gifu 509-5292, Japan

2)

SOKENDAI, Department of Fusion Science, 322-6 Oroshi, Toki, Gifu 509-5292, Japan

(Received 26 December 2017 / Accepted 12 March 2018 / Published 10 April 2018)

Abstract

A Cable-in-conduit (CIC) conductor, in which superconducting wires are multi-stage twisted and inserted into a tube-like conduit, has been developed mainly for fusion magnets. CIC conductors with Nb₃Sn wires are primary candidates for the magnets of the next fusion reactors. Since an A15 phase superconductor such as Nb₃Sn is brittle, heat treatment for production of the A15 phase must be carried out after manufacturing the conductor. Either the wind and react (WR) or the wind, react, and transfer (WRT) method has been applied for the CIC conductors with Nb₃Sn wires in order to prevent degradation of the critical current by excess strain after the heat treatment. The allowable strain after the heat treatment is considered to be 0.2 %. Since the WRT technique has been matured through manufacture of the ITER magnets, adaption of the WRT method to helical coils of an LHD type reactor is studied.

Copyright (c) 2018 The Japan Society of Plasma Science and Nuclear Fusion Research

Keywords

cable-in-conduit conductor, fusion reactor, helical coil, wind-and-react, superconducting magnet

DOI: 10.1585/pfr.13.3405027

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