Design and performance of multiloop and washer SQUIDs intended for sub-kelvin operation

Mikko Kiviranta (Corresponding Author), Jari S. Penttilä, Leif Grönberg, Juha Hassel, Antti Virtanen, Heikki Seppä

    Research output: Contribution to journalArticleScientificpeer-review

    14 Citations (Scopus)


    We have developed a set of dc SQUIDs intended for frequency-domain multiplexed readout of transition edge sensor (TES) arrays. The first design is based on the Ketchen-style washer, and has exhibited a 1.2 × 10−7 Φ0 Hz1/2 flux noise both at 4.2 and 0.43 K. The second design is based on the multiloop structure and utilizes the spoke-terminating resistors which double as junction shunts in order to minimize the excess noise due to the resonance damping. The multiloop device has exhibited a 3.5 × 10−7 Φ0 Hz1/2 flux noise level at 4.2 K. The mutual inductances are chosen such that a typical ac-biased TES-based x-ray calorimeter would need only a moderate amount of negative feedback in order to handle the dynamic range of the signal.
    Original languageEnglish
    Pages (from-to)285 - 289
    Number of pages5
    JournalSuperconductor Science and Technology
    Issue number5
    Publication statusPublished - 2004
    MoE publication typeA1 Journal article-refereed


    • SQUID
    • washer
    • transition edge sensor
    • bipolar transistors
    • superconducting transistors


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