Development of a Persistent Current Mode 9.39 T (400 MHz) LTS/Bi-2223 NMR Magnet With a Bi-2223 Superconducting Joint

Takeda, Yasuhisa; Suetomi, Yu; Nakai, Ukyo; Piao, Rui‐Qi; Matsutake, Yuichi; Yagai, Tsuyoshi; Motoki, Takanori; Shimoyama, Jun–ichi; Hamada, Mamoru; Saito, Kazuyoshi; Yanagisawa, Yoshinori

doi:10.1109/tasc.2022.3162795

Cited by 10 publications

(6 citation statements)

References 11 publications

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“…The Ic of the tape is about 180 A at 77 K in self-field and higher than 1 kA at 4 K and 1 T parallel to the tape surface [19]. Both ends of the tape were connected using our joining processes [7][10] [12] [20]. The reinforcement at both ends was removed.…”

Section: Methodsmentioning

confidence: 99%

Angular Dependence of Critical Current and Grain Alignment in Bi-2223 Superconducting Joint

Takeda,

Nishijima,

Nakai

et al. 2024

IEEE Trans. Appl. Supercond.

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We clarify the relationship between the angular dependence of critical current in a Bi-2223 superconducting joint and the grain alignment of an intermediate layer in the joint. The angular dependence of critical current for the superconducting joint is discussed using a model to describe that for a Bi-2223 tape. Considering an angle of the c-axis grain misalignment, the angular dependence is calculated. The misalignment angle is validated from the microstructure observations of the intermediate layer. We can conclude that the c-axis grain alignment in the intermediate layer dominates the angular dependence of critical current in the superconducting joint.

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Section: Methodsmentioning

confidence: 99%

Angular Dependence of Critical Current and Grain Alignment in Bi-2223 Superconducting Joint

Takeda,

Nishijima,

Nakai

et al. 2024

IEEE Trans. Appl. Supercond.

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“…12. Persistent current operation tests were carried out by connecting the 400 MHz magnet system at RIKEN and negligible small change in magnetic field was confirmed for both joints [64,65]. As mentioned above, 30.5 T superconducting magnet with persistent current circuit for 1.3 GHz‐NMR system will be fabricated in a few years.…”

Section: Recent Topicsmentioning

confidence: 99%

Current Status of High Temperature Superconducting Materials and their Various Applications

Shimoyama,

Motoki

2023

IEEJ Transactions Elec Engng

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It took longer time than initially expected for development of cuprate superconducting materials for practical applications. However, there are about 20 companies that manufacture and supply long conductors and bulk materials at present. Although various large‐scale projects have supported the process of material development, material and equipment developments have been progressing under the leadership of manufacturers in recent years. In this paper, current status of development of high‐temperature superconducting materials, including MgB2, which is classified as a high temperature superconductor, and their applications are summarized, along with the history, basic physical features and recent topics. © 2023 Institute of Electrical Engineer of Japan and Wiley Periodicals LLC.

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“…This result indicates that operation of the superconducting magnet under persistent current mode is possible. In addition, persistent current operation of a Bi2223 coil connected to the 400 MHz NMR system was also demonstrated for a long time [21].…”

Section: Transport Current Properties Of Bb Jointmentioning

confidence: 99%

Superconducting joints for the 1.3 GHz persistent NMR magnet under JST-Mirai Program

Shimoyama

2023

Supercond. Sci. Technol.

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Superconducting joint technologies connecting high-T c superconducting (HTS) tapes, such as REBCO-coated conductors and Bi2223 silver-sheathed tapes, have been developed for the fabrication of superconducting magnets generating 30.5 T with persistent current operation at 4.2 K under the JST-Mirai Program since 2017. These are indirect joints using a superconducting intermediate layer to join highly crystallized HTS layers of tapes. Thus far, high I c values of above 100 A at 77 K in the self-field have been achieved by both joints. These performances are sufficient for installation to the 30.5 T magnet, while efforts to further improve the reproducibility of high I c for joints connecting long-length HTS tapes have been continuously made. The current status of HTS joint technologies is summarized in this paper partly from the view point of material science.

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Development of a Persistent Current Mode 9.39 T (400 MHz) LTS/Bi-2223 NMR Magnet With a Bi-2223 Superconducting Joint

Cited by 10 publications

References 11 publications

Angular Dependence of Critical Current and Grain Alignment in Bi-2223 Superconducting Joint

Angular Dependence of Critical Current and Grain Alignment in Bi-2223 Superconducting Joint

Current Status of High Temperature Superconducting Materials and their Various Applications

Superconducting joints for the 1.3 GHz persistent NMR magnet under JST-Mirai Program

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