• DocumentCode
    955011
  • Title

    A reliable DC squid made with tunnel junctions

  • Author

    Clarke, John ; Goubau, Wolfgang M. ; Ketchen, Mark B.

  • Author_Institution
    Univ. of Calif., Berkeley
  • Volume
    11
  • Issue
    2
  • fYear
    1975
  • fDate
    3/1/1975 12:00:00 AM
  • Firstpage
    724
  • Lastpage
    727
  • Abstract
    D.C. SQUIDS of cylindrical geometry have been fabricated using Nb-NbOx-Pb tunnel junctions. The SQUIDs can be thermally cycled repeatedly and cooled in the earth\´s magnetic field without significant loss of performance. Flux resolution of 3 \\times 10^{-5} \\phi_{o}/\\sqrt {Hz} above a frequency of 1 Hz has been achieved through optimization of electronic circuitry and careful shielding. Fluctuations and drift in the temperature of the helium bath are found to be the major source of long-term SQUID noise. With a simple temperature stabilizer, drift has been reduced to less than 8 \\times 10^{-5} \\phi_{o} /hr over a three hour period.
  • Keywords
    Magnetometers, superconducting; Circuits; Earth; Fluctuations; Frequency; Geometry; Helium; Magnetic shielding; Performance loss; SQUIDs; Temperature;
  • fLanguage
    English
  • Journal_Title
    Magnetics, IEEE Transactions on
  • Publisher
    ieee
  • ISSN
    0018-9464
  • Type

    jour

  • DOI
    10.1109/TMAG.1975.1058697
  • Filename
    1058697
    • Link To Document
    https://search.isc.ac/dl/search/defaultta.aspx?DTC=49&DC=955011