R&D of Common Core Technologies for HTS Coils

• Published in: TEION KOGAKU (Journal of Cryogenics and Superconductivity Society of Japan) Vol. 52; no. 4; pp. 244 - 252
• Main Authors: IZUMI, Teruo, MACHI, Takato, IBI, Akira, NAKAOKA, Koichi, IWAKUMA, Masataka, KISS, Takanobu, TOMIOKA, Akira, KATO, Takeharu, MIURA, Masashi
• Format: Journal Article
• Language: English
• Published: CRYOGENICS AND SUPERCONDUCTIVITY SOCIETY OF JAPAN 20.07.2017
• Subjects: coated conductor; in-field Ic; joint; REBCO; shielding current; Some figures in this article may appear in colour only in the electronic version
• ISSN: 0389-2441; 1880-0408
• DOI: 10.2221/jcsj.52.244

The major results of conducting research and development on the common core technologies for HTS coils are reviewed. The theme has three sub-themes that are necessary for advanced superconducting devices. For the sub-theme of long coated conductors (CCs) with a high in-field Ic, a 93 m-long CC with a high Ic (min.) value of 124 A/cm-w at 77 K under 3 T was successfully fabricated by PLD. Concerning the sub-theme of generating CCs at low heat, Ic uniformity and scribing technique were both improved and uniform filament Ic values were confirmed. Additionally, lower a joint resistance than 3 nΩ was achieved using a paste that included nano-sized metals. In the sub-theme regarding the fundamental evaluation of CCs and coils, the effect of CC scribing on the decay of the shielding current was confirmed both in CCs and coils. Furthermore, a new operation process for the MRI magnet was proposed based on the above-mentioned knowledge.