A coupled DC SQUID with low 1/f noise

Heikki Seppä, Mikko Kiviranta, Alexandre Satrapinski, Leif Grönberg, Jorma Salmi, Ilkka Suni

    Research output: Contribution to journalArticleScientificpeer-review

    26 Citations (Scopus)

    Abstract

    A low-noise coupled DC superconducting quantum interference device (SQUID) especially optimized for low frequency is discussed. Using large Josephson junctions and a low loop inductance the contribution of the critical current fluctuation to 1/f noise can be minimized. To minimize the inductance the Josephson junctions are placed in the center of the washer close to the SQUID loop. A scaled-up copper model of the SQUID and the signal coil is used to analyze the impedance of the SQUID loop affected by the signal coil. An equivalent circuit model describing the effective inductance of the SQUID loop as a function of the frequency is used to design appropriate damping of the resonances. The DC SQUID characteristics are smooth and the noise performance of the SQUID does not markedly suffer from resonances. The contribution of the 1/f noise at 1 Hz is found to be about 5*10-7 φ0 √Hz.
    Original languageEnglish
    Pages (from-to)1816 - 1819
    Number of pages4
    JournalIEEE Transactions on Applied Superconductivity
    Volume3
    Issue number1
    DOIs
    Publication statusPublished - 1993
    MoE publication typeA1 Journal article-refereed

    Fingerprint

    SQUIDs
    direct current
    interference
    inductance
    Inductance
    Josephson junctions
    coils
    washers
    Washers
    Critical currents
    equivalent circuits
    Equivalent circuits
    low noise
    Copper
    critical current
    Damping
    damping
    impedance
    low frequencies
    copper

    Cite this

    Seppä, Heikki ; Kiviranta, Mikko ; Satrapinski, Alexandre ; Grönberg, Leif ; Salmi, Jorma ; Suni, Ilkka. / A coupled DC SQUID with low 1/f noise. In: IEEE Transactions on Applied Superconductivity. 1993 ; Vol. 3, No. 1. pp. 1816 - 1819.
    @article{ae26b5f68dee410ab015b513902c2f96,
    title = "A coupled DC SQUID with low 1/f noise",
    abstract = "A low-noise coupled DC superconducting quantum interference device (SQUID) especially optimized for low frequency is discussed. Using large Josephson junctions and a low loop inductance the contribution of the critical current fluctuation to 1/f noise can be minimized. To minimize the inductance the Josephson junctions are placed in the center of the washer close to the SQUID loop. A scaled-up copper model of the SQUID and the signal coil is used to analyze the impedance of the SQUID loop affected by the signal coil. An equivalent circuit model describing the effective inductance of the SQUID loop as a function of the frequency is used to design appropriate damping of the resonances. The DC SQUID characteristics are smooth and the noise performance of the SQUID does not markedly suffer from resonances. The contribution of the 1/f noise at 1 Hz is found to be about 5*10-7 φ0 √Hz.",
    author = "Heikki Sepp{\"a} and Mikko Kiviranta and Alexandre Satrapinski and Leif Gr{\"o}nberg and Jorma Salmi and Ilkka Suni",
    note = "Project code: PUO1042",
    year = "1993",
    doi = "10.1109/77.233329",
    language = "English",
    volume = "3",
    pages = "1816 -- 1819",
    journal = "IEEE Transactions on Applied Superconductivity",
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    A coupled DC SQUID with low 1/f noise. / Seppä, Heikki; Kiviranta, Mikko; Satrapinski, Alexandre; Grönberg, Leif; Salmi, Jorma; Suni, Ilkka.

    In: IEEE Transactions on Applied Superconductivity, Vol. 3, No. 1, 1993, p. 1816 - 1819.

    Research output: Contribution to journalArticleScientificpeer-review

    TY - JOUR

    T1 - A coupled DC SQUID with low 1/f noise

    AU - Seppä, Heikki

    AU - Kiviranta, Mikko

    AU - Satrapinski, Alexandre

    AU - Grönberg, Leif

    AU - Salmi, Jorma

    AU - Suni, Ilkka

    N1 - Project code: PUO1042

    PY - 1993

    Y1 - 1993

    N2 - A low-noise coupled DC superconducting quantum interference device (SQUID) especially optimized for low frequency is discussed. Using large Josephson junctions and a low loop inductance the contribution of the critical current fluctuation to 1/f noise can be minimized. To minimize the inductance the Josephson junctions are placed in the center of the washer close to the SQUID loop. A scaled-up copper model of the SQUID and the signal coil is used to analyze the impedance of the SQUID loop affected by the signal coil. An equivalent circuit model describing the effective inductance of the SQUID loop as a function of the frequency is used to design appropriate damping of the resonances. The DC SQUID characteristics are smooth and the noise performance of the SQUID does not markedly suffer from resonances. The contribution of the 1/f noise at 1 Hz is found to be about 5*10-7 φ0 √Hz.

    AB - A low-noise coupled DC superconducting quantum interference device (SQUID) especially optimized for low frequency is discussed. Using large Josephson junctions and a low loop inductance the contribution of the critical current fluctuation to 1/f noise can be minimized. To minimize the inductance the Josephson junctions are placed in the center of the washer close to the SQUID loop. A scaled-up copper model of the SQUID and the signal coil is used to analyze the impedance of the SQUID loop affected by the signal coil. An equivalent circuit model describing the effective inductance of the SQUID loop as a function of the frequency is used to design appropriate damping of the resonances. The DC SQUID characteristics are smooth and the noise performance of the SQUID does not markedly suffer from resonances. The contribution of the 1/f noise at 1 Hz is found to be about 5*10-7 φ0 √Hz.

    U2 - 10.1109/77.233329

    DO - 10.1109/77.233329

    M3 - Article

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    JO - IEEE Transactions on Applied Superconductivity

    JF - IEEE Transactions on Applied Superconductivity

    SN - 1051-8223

    IS - 1

    ER -