Analysis of a Josephson junction noise Thermometer with a DC-SQUID preamplifier

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    A Josephson junction noise thermometer directly coupled to a low noise preamplifier is analyzed. The absolute determination of temperature is disturbed by several effects: mixed down noise, additive noise, post-detection filter, etc. The analysis presented here takes these error sources into account, and the accuracy of the thermometer is estimated. The analysis shows that, exactly like an rf-biased i2-SQUID noise thermometer, a directly coupled noise thermometer is ultimately limited by the noise temperature of the preamplifier. Since the noise temperature of a state-of-the-art dc SQUID amplifier is excellent, sufficiently low uncertainty (less than 1%) can be obtained, even below 1 mK.
    Original languageEnglish
    Title of host publicationSuperconducting Devices and Their Applications
    EditorsHans Koch, Heinz Lübbig
    Place of PublicationHeidelberg
    ISBN (Electronic)978-3-642-77457-7
    ISBN (Print)978-3-642-77459-1
    Publication statusPublished - 1992
    MoE publication typeA4 Article in a conference publication
    Event4th International Conference SQUID ’91 - Berlin, Germany
    Duration: 18 Jun 199221 Jun 1992

    Publication series

    SeriesSpringer Proceedings in Physics


    Conference4th International Conference SQUID ’91


    • Josephson junction

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    Seppä, H. (1992). Analysis of a Josephson junction noise Thermometer with a DC-SQUID preamplifier. In H. Koch, & H. Lübbig (Eds.), Superconducting Devices and Their Applications (pp. 460-465). Springer. Springer Proceedings in Physics, Vol.. 64