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HTS Cable International Round Robin: 4.4 kA Critical Current Measurements [dataset] Open Access

The critical current of the core and shield of a 2.1 m long, 40 mm diameter Bi-2223 HTS coaxial cable was measured as part of an International Round Robin organised by Japan involving several international laboratories. In Durham, we found using a 100 µVm−1 criterion and an 8 minute trace time that Ic of the core and shield were 4386 A and 4143 A and the n-values were 19.6 and 14.4 respectively. 8 minute trace times were found to be a practical approximation of steady state conditions, with critical current values 0.5% and 1.2% larger than values obtained using 2 minute trace times, and n-values not significantly different to 2 minute trace values. Two minute trace time data were compared with equivalent data from other participating labs and excellent agreement was found:Ic was 0.6% and 1.5% larger for the core and shield respectively. The E-field range has a significant effect on the n-value measurements, which varied between groups. Good agreement between the participants for the shield was found for electric fields below 100 µVm−1, although larger n-values were found at higher electric fields at Durham and some other laboratories. The polarity of the current and the proximity of the return power cable were demonstrated to have negligible effect (<0.1%) on the Ic measurements. Removing conductive and ferromagnetic materials that were part of Durham’s experimental set-up increased Ic by <1%. An intrinsic trace time dependency was found for Ic for trace times of less than 8 minutes that we attribute to the time required for fluxons to equilibrate with the underlying pinning landscape in a changing net magnetic field.

Descriptions

Resource type

Dataset

Contributors

Creator: Hutson, Rollo ¹
Creator: Raine, Mark ¹
Editor: Hampshire, Damian ¹
Kiuchi, Masaru ²
Matsushita, Teruo ²

¹ Durham University, UK
² Kyushu Institute of Technology, Iizuka, Japan

Funder

Engineering and Physical Sciences Research Council (Grant EP/L01663X/1), U.K. Government Department for Business, Energy and Industrial Strategy

Research methods

Other description

Keyword

Superconducting cable
critical current measurements
standards
Round Robin Test

Subject

Superconductivity

Location

Language

Cited in

doi:10.1109/TASC.2023.3263143

Identifier

ark:/32150/r19s1616216
doi:10.15128/r19s1616216

Rights

Creative Commons Attribution-ShareAlike 4.0 International (CC BY-SA)

Publisher

Durham University

Date Created

File Details

Depositor

R. Hutson

Date Uploaded

13 March 2023, 16:03:11

Date Modified

19 May 2023, 13:05:08

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Audits have not yet been run on this file.

Characterization

File format: zip (ZIP Format)

Mime type: application/zip

File size: 279897

Last modified: 2023:05:17 15:58:21+01:00

Filename: Hutson 2023 csv dataset.zip

Original checksum: 5e4e2fe48550cef6f9afae67cc673fe7