Improved Superconducting Direct Current Meter for 25–50 kA

H.W. Weijers, A. Godeke, B. ten Haken, S. Wessel, H.H.J. ten Kate

    Research output: Chapter in Book/Report/Conference proceedingChapterAcademic


    An accurate meter to measure direct currents in closed superconducting circuits exposed to high magnetic fields js presented. A toroidal superconducting (sc.) transformer, which consists of a sc. Rogowski pick-up coil and sc. compensation windings, encloses the unknown current The second part of the sc. transformer circuit is a sensing coil around a Hall probe, both perfectly shielded from AC and DC magnetic stray fields. The Hall voltage is amplified and fed back to the compensation current in order to keep the Hall voltage constant. This small compensation current is measured using a shunt and forms an accurate measure for the unknown current. It is used in a second feedback loop to control the unknown current. An additional compensation circuit corrects for undesired magnetic coupling between the current source and the toroidal pick-up coil. With this arrangement a short term accuracy of 0.1% of the full range is obtained. The current is extremely stable, the drift is below 0.25 A per minute. This improved current meter facilitates accurate determination of voltage-current characteristics of superconductors, carrying currents in the range of 25–50 kA and being exposed to high magnetic fields.
    Original languageEnglish
    Title of host publicationAdvances in Cryogenic Engineering
    Subtitle of host publicationProceedings of the 1993 Cryogenic Engineering Conference, held July 12-16, 1993, in Albuquerque, New Mexico
    EditorsPeter Kittel
    Place of PublicationBoston, MA
    Number of pages6
    ISBN (Electronic)978-1-4615-2522-6
    ISBN (Print)978-1-4613-6074-2
    Publication statusPublished - 1994
    Event1993 Cryogenic Engineering Conference and International Cryogenic Materials Conference, CEC/ICMC 1993 - Albuquerque, United States
    Duration: 12 Jul 199316 Jul 1993

    Publication series

    NameAdvances in Cryogenic Engineering
    ISSN (Print)0065-2482


    Conference1993 Cryogenic Engineering Conference and International Cryogenic Materials Conference, CEC/ICMC 1993
    Abbreviated titleCEC/ICMC
    Country/TerritoryUnited States


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