Plasma and Fusion Research

Volume 17, 2405076 (2022)

Regular Articles

Progress of HTS STARS Conductor Development for the Next-Generation Helical Fusion Experimental Device
Nagato YANAGI1,2), Yoshiro TERAZAKI1), Yoshiro NARUSHIMA1,2), Yuta ONODERA1), Naoki HIRANO1), Shinji HAMAGUCHI1,2), Hirotaka CHIKARAISHI1), Suguru TAKADA1,2), Satoshi ITO3) and Kazuya TAKAHATA1,2)
1)
National Institute for Fusion Science, 322-6 Oroshi-cho, Toki, Gifu 509-5292, Japan
2)
The Graduate University for Advanced Studies, SOKENDAI, 322-6 Oroshi-cho, Toki, Gifu 509-5292, Japan
3)
Tohoku University, 6-6-01-2 Aramaki-Aza-Aoba, Aoba-ku, Sendai, Miyagi 982-8579, Japan
(Received 10 January 2022 / Accepted 25 April 2022 / Published 8 July 2022)

Abstract

A High-Temperature Superconducting (HTS) magnet is being considered to for use in the next-generation helical experimental devices. Three types of large-current HTS conductors are being developed, and one of them is the STARS (Stacked Tapes Assembled in Rigid Structure) conductor which uses HTS tapes with a simple stacking technique. Following the proof-of-principle experimental results obtained in the former 100-kA-class prototype hand-made conductor sample, an actually applicable conductor is being developed with a rated current of 18 kA at a temperature of 20 K and a magnetic field of ∼10 T. One of the crucial requirements for this conductor is to have a high current density of 80 A/mm2. In the first phase of the development, a 3-m short sample was fabricated by applying laser-beam welding to the stainless-steel jacket. It was tested in liquid nitrogen at 77 K with no external magnetic field. Then the sample was tested in gaseous helium at 20 - 40 K under a magnetic field of 6 - 8 T, and the results show that the basic requirements were satisfied.

Keywords

high-temperature superconductor (HTS), REBCO, STARS, helical fusion reactor, FFHR

DOI: 10.1585/pfr.17.2405076

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