Dc- and un-SQUIDs for readout of ac-biased transition-edge sensors

Mikko Kiviranta, Jari S. Penttilä, Leif Grönberg, Heikki Seppä, Ilkka Suni

    Research output: Contribution to journalArticleScientificpeer-review

    9 Citations (Scopus)


    We have developed a set of SQUIDs optimized for readout of ac-biased transition edge sensors. Junction shunts are made of Pd and attached to cooling fins to facilitate low-noise operation at sub-kelvin temperatures. SQUID's have a low loop inductance in order to reach a large natural dynamic range even without negative feedback. The SQUIDs are intended to be used for frequency-domain multiplexing of X-ray calorimeter arrays. Both traditional dc-SQUIDs and novel un-SQUIDs are manufactured. The fabrication process and SQUID design criteria are reviewed.
    Original languageEnglish
    Pages (from-to)614-617
    Number of pages3
    JournalIEEE Transactions on Applied Superconductivity
    Issue number2
    Publication statusPublished - 2003
    MoE publication typeA1 Journal article-refereed


    • SQUID
    • X-ray detection
    • X-ray imaging
    • calorimeters
    • inductance
    • palladium
    • superconducting device noise
    • frequency-domain multiplexing
    • junction shunts
    • Josephson junction
    • loop inductance
    • low-noise operation
    • natural dynamic range
    • negative feedback
    • readout
    • sub-kelvin temperatures


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