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In the straight beamlines of the SuperKEK B Tsukuba area, 16 conventional sextupole magnets have been installed at intervals of 20–35 m. To achieve high luminosity, higher precision beam tuning with sextupole magnets is required. In KEK, a study on a superconducting sextupole magnet system involving three types of corrector magnets is ongoing. Considering the operating temperature of the system, an A15 compound superconductor, Nb3Al, is being studied for use as the cable material, and the development of the reaction and winding coil production with Nb3Al cable has been attempted. This study developed an Nb3Al ultra-fine strand superconducting cable with a strand of φ50 μm for the corrector magnets, and the critical currents of the cable were measured as functions of the bending radius and the temperature. This paper reports the temperature dependence of the critical currents of the bent Nb3Al cables after heat treatment.

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• Creative Commons BY Attribution 4.0 International
  

Keyword: Nb3Al cable, super fine strand, critical current, superconducting sextupole magnet, superconducting corrector magnet, superkekb

Date published: 2025-01-27

Publisher: Institute of Electrical and Electronics Engineers (IEEE)

Journal:

• IEEE Transactions on Applied Superconductivity (ISSN: 10518223) vol. 35 issue. 5 p. 1-5

Funding:

• Grants-in-Aid for Scientific Research of JSPS 21H04477
• Grants-in-Aid for Scientific Research of JSPS 22H03876

Manuscript type: Author's version (Accepted manuscript)

MDR DOI: https://doi.org/10.48505/nims.5575

First published URL: https://doi.org/10.1109/tasc.2025.3532235

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Updated at: 2025-07-11 08:30:43 +0900

Published on MDR: 2025-07-11 08:16:44 +0900