The design of a system of adjustable superconducting plates for balancing a gradiometer

J.A. Overweg, M.J. Peters

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Abstract

The gradiometer of a SQUID-system for measuring very small biomagnetic signals should be made as insensitive as possible to the much larger uniform background fields. The balance of a gradiometer can be improved considerably by modifying the effective area of the gradiometer loops by a system of small adjustable superconducting plates. This paper is intended as an aid for designing such a balancing system. We calculated the effective area of a gradiometer loop perpendicular to a rectangular or parallel to a circular plate. The paper contains graphs showing how large the plates have to be and where they must be placed. The calculations show that for accurate balancing the distance of a plate to the wire of a loop must be large and that the plates must be as small as possible.
Original languageUndefined
Pages (from-to)529-534
JournalCryogenics
Volume18
Issue number9
DOIs
Publication statusPublished - 1978

Keywords

  • IR-68427

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