10 kA Joints for HTS Roebel Cables

Jaakko Murtomäki, Glyn Kirby, Jeroen van Nugteren, Pierre Antoine Contat, Jerome Fleiter, Oscar Sacristan De Frutos, Francois Olivier Pincot, Gijs DeRijk, Lucio Rossi, Janne Ruuskanen, Antti Stenvall, Felix Wolf

    Research output: Contribution to journalArticleScientificpeer-review

    11 Citations (Scopus)

    Abstract

    Future HTS high field magnets using multi-tape HTS cables need 10 kA low resistance connections. The connections are needed between the poles of the magnets and at the terminals in a wide operating temperature range, from 1.9-85 K. The EuCARD WP10 Future Magnets collaboration aims at testing HTS based Roebel cables in an accelerator magnet. Usually, LTS cables are jointed inside a relatively short soldered block. Powering tests at CERN have highlighted excess heating of a joint following classical LTS joint design. The HTS Roebel cables are assembled from REBCO coated conductor tapes in a transposed configuration. Due to this, the tapes surface the cable at an angle with the cable axis. A low-resistance joint requires a sufficiently large interface area for each tape. Within one twist pitch length, each tape is located at the surface of the cable over a relatively small non-constant area. This geometry prevents making a well-controlled joint in a compact length along the cable. This paper presents a compact joint configuration for the Roebel cable overcoming these practical challenges. A new joint called fin-block is designed. The joint resistance is estimated computationally. Finally the test results as a function of current and temperature are presented.

    Original languageEnglish
    JournalIEEE Transactions on Applied Superconductivity
    Volume28
    Issue number3
    Early online date9 Feb 2018
    DOIs
    Publication statusPublished - 2018
    Publication typeA1 Journal article-refereed

    Keywords

    • Cables and current leads
    • Heating systems
    • High-temperature superconductors
    • HTS Magnets
    • Pressure Measurement
    • Resistance
    • Resistance measurement
    • Soldering
    • Superconducting cables
    • Superconducting magnets
    • Superconducting Magnets
    • Temperature measurement

    Publication forum classification

    • Publication forum level 1

    ASJC Scopus subject areas

    • Electronic, Optical and Magnetic Materials
    • Condensed Matter Physics
    • Electrical and Electronic Engineering

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