The Reduction of the Critical Current under Transverse Pressure in a New TWCA MJR Cabled Conductor

Johannes M. van Oort, Ronald M. Scanlan, Huub B. Weijers, Herman H.J. ten Kate

    Research output: Chapter in Book/Report/Conference proceedingChapterAcademic

    Abstract

    The degradation of the critical current of several impregnated and insulated Rutherford type Nb3Sn cables is investigated under an applied transverse load and magnetic field. The cables are made of a new TWCA modified jelly-roll strand material which has been optimized for an extremely high critical current density. The cables have various keystone angles and compaction factors and the dependency of the degradation on these parameters is described. The voltage-current characteristics are determined for the magnetic field ranging from 5 to 11 T and pressure up to 250 MPa. A micro-analysis of the strands is performed before and after the tests to determine possible damage to the filaments. It is found that the initial degradation and subsequent sensitivity to transverse pressure show a strong dependence on the compaction at the narrow edge during cabling. For a cable in which the strands are deformed by 33%, an initial degradation due to cabling is found to be 67%, with a relative degradation of 25% at 150 MPa. For a rectangular cable with a deformation of only 11%, the initial damage is less than 2%, with 3% degradation at 150 MPa. Moreover, the heavily compacted cables tend to show irreversible damage, whereas the less compacted cables show a full recovery.
    Original languageEnglish
    Title of host publicationAdvances in Cryogenic Engineering Materials
    EditorsRichard P. Reed, Fred R. Fickett, Leonard T. Summers, M. Stieg
    Place of PublicationBoston, MA
    PublisherPlenum
    Pages867-874
    Number of pages13
    Volume40A
    ISBN (Electronic)978-1-4757-9053-5
    ISBN (Print)978-1-4757-9055-9
    DOIs
    Publication statusPublished - 1994

    Publication series

    NameAn International Cryogenic Materials Conference Publication
    PublisherSpringer
    Volume40
    ISSN (Print)0065-2482

    Keywords

    • Critical current
    • Initial degradation
    • Transverse pressure
    • Compaction factor
    • High critical current density

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