# Critical Current and AC Loss Characteristics of Ultrafine Nb<sub>3</sub>Al and Nb<sub>3</sub>Sn Superconducting Wires Under Conduction Cooling

https://mdr.nims.go.jp/datasets/bae1497d-06a9-4d73-8bcd-802cc613b849

## File

- [ASC2024-KIMver0.pdf](https://mdr.nims.go.jp/filesets/0de55653-f4ba-4865-a122-15d7c4b8d0e7/download) ([Detail](https://mdr.nims.go.jp/filesets/0de55653-f4ba-4865-a122-15d7c4b8d0e7.md))

## Id

bae1497d-06a9-4d73-8bcd-802cc613b849

## Local identifier



## Visibility

open_to_public

## State

published

## Created at

2025-07-14T11:31:24.828484Z

## Updated at

2025-07-15T03:30:25.099011Z

## Published at

2025-07-15T03:17:06.483030Z

## Doi

https://doi.org/10.48505/nims.5588

## First published url

https://doi.org/10.1109/tasc.2024.3513936

## Date published

2024-12-09

## Recorded date published



## Resource type

journal_article

## Manuscript type

accepted_manuscript

## Collection



## Title

- title: Critical Current and AC Loss Characteristics of Ultrafine Nb<sub>3</sub>Al
    and Nb<sub>3</sub>Sn Superconducting Wires Under Conduction Cooling
  title_type: original
  lang: en

## Description

- description: An ultrafine A15 composite wires with a diameter of 30 to 50 mm were
    developed by the National Institute for Materials Science (NIMS) to enable the
    use of R&W technology for the fabrication of superconducting magnets. Nb3Al wires
    were fabricated using the Jelly-rolled method, and Nb/Al composite monofilament
    Nb3Al superconducting wires and Nb3Al multi-stranded wires were successfully fabricated.
    In this Jelly-roll process, pure Nb and Al foils were prepared as starting materials,
    and those foils were tightly overlapped around a pure core material. On the other
    hand, ultrafine Nb3Sn wires were fabricated by the bronze process. The starting
    billet of Nb3Sn wire was 19 Nb rods. Furthermore, it was composed of a bronze
    alloy matrix containing Cu, Sn, and Ti, and a Nb diffusion barrier. A Cu stabilizer
    was placed on the outermost layer. Our goal is to develop flexible, ultrafine
    Nb3Sn and Nb3Al wires that can be used in the react & wind method, and we plan
    to use these high-performance ultrafine wires to develop superconducting applications
    operated in cryocoolers. We have in mind not only DC but also AC applications
    for superconducting applications. In this paper, single and multi-stranded ultrafine
    Nb3Al and Nb3Sn superconducting sample wires with different diameters were prepared
    to evaluate the critical properties and AC loss characteristics. The critical
    current and n value of sample wires are measured by current sweep, constant current,
    and pulse current methods using conduction cooling by a 4K cryocooler. The measured
    temperature (4.5 K -14 K) dependence of the critical current and the AC loss characteristics
    of fabricated ultrafine Nb3Al and Nb3Sn superconducting sample wires will be presented.
  description_type: abstract
  lang: und

## Creator

- name: SeokBeom Kim
  role: author
  orcid: https://orcid.org/0000-0002-2946-5763
- name: Tomoya Sakamoto
  role: author
- name: Riku Onoue
  role: author
- name: Satoshi Nishikori
  role: author
- name: Ryota Inoue
  role: author
  orcid: https://orcid.org/0000-0001-5486-2288
- name: Hiroshi Ueda
  role: author
  orcid: https://orcid.org/0000-0003-4976-8638
- name: Akihiro Kikuchi
  role: author
  orcid: https://orcid.org/0000-0002-5044-7156
- name: Yasuo Iijima
  role: author
  orcid: https://orcid.org/0000-0002-9008-9429

## Contact agent



## Publisher

organization: Institute of Electrical and Electronics Engineers (IEEE)

## Managing organization



## Keyword

- subject: AC transport current losses
  schema: not_defined
- subject: critical properties
  schema: not_defined
- subject: cryocooler system
  schema: not_defined
- subject: ultrafine Nb3Al wire
  schema: not_defined
- subject: ultrafine Nb3Sn wire
  schema: not_defined

## Rights

- description: "© 2025 IEEE.  Personal use of this material is permitted.  Permission
    from IEEE must be obtained for all other uses, in any current or future media,
    including reprinting/republishing this material for advertising or promotional
    purposes, creating new collective works, for resale or redistribution to servers
    or lists, or reuse of any copyrighted component of this work in other works."
  identifier: http://rightsstatements.org/vocab/InC/1.0/

## Other identifier(s)



## Data origin

- data_origin_type: other

## Embargo



## Journal

- title: IEEE Transactions on Applied Superconductivity
  issn: '10518223'
  volume: '35'
  issue: '5'
  start_page: 1
  end_page: 4

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## Chemical composition



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  md5: 48e0591cf9f5278d930ded7475ab286a

## Thumbnail

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filename: ASC2024-KIMver0.pdf