A femtoamperemeter based on a superconducting quantum interferometer and a bulk transformer

M.A. Tarasov; A.S. Kalabukhov; S.A. Kovtonyuk; I.L. Lapitskaya; S.A. Gudoshnikov; Mikko Kiviranta; O.V. Snigirev; L.S. Kuzmin; Heikki Seppä

A femtoamperemeter based on a superconducting quantum interferometer and a bulk transformer

M.A. Tarasov, A.S. Kalabukhov, S.A. Kovtonyuk, I.L. Lapitskaya, S.A. Gudoshnikov, Mikko Kiviranta, O.V. Snigirev, L.S. Kuzmin, Heikki Seppä

Research output: Contribution to journal › Article › Scientific › peer-review

3 Citations (Scopus)

Abstract

A femtoamperemeter based on a superconducting quantum interference device (SQUID) with a planar on-chip gradiometric transformer and an additional volume cryogenic transformer on a toroidal ferromagnetic core is developed, fabricated, and experimentally studied. The conditions for the optimum matching of the SQUID to the signal source are analyzed. It is demonstrated that the conditions for the optimum matching and high coupling coefficient are satisfied in the transformer with a ferromagnetic core. The excess noise introduced by the core is studied experimentally. It is shown that double shielding using superconducting and ferromagnetic shields makes it possible to lower the cutoff frequency of the excess noise to less than 1 kHz.

Original language	English
Pages (from-to)	1404-1409
Number of pages	6
Journal	Journal of Communications Technology and Electronics
Volume	48
Issue number	12
Publication status	Published - 2003
MoE publication type	A1 Journal article-refereed

Cite this

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title = "A femtoamperemeter based on a superconducting quantum interferometer and a bulk transformer",

abstract = "A femtoamperemeter based on a superconducting quantum interference device (SQUID) with a planar on-chip gradiometric transformer and an additional volume cryogenic transformer on a toroidal ferromagnetic core is developed, fabricated, and experimentally studied. The conditions for the optimum matching of the SQUID to the signal source are analyzed. It is demonstrated that the conditions for the optimum matching and high coupling coefficient are satisfied in the transformer with a ferromagnetic core. The excess noise introduced by the core is studied experimentally. It is shown that double shielding using superconducting and ferromagnetic shields makes it possible to lower the cutoff frequency of the excess noise to less than 1 kHz. ",

author = "M.A. Tarasov and A.S. Kalabukhov and S.A. Kovtonyuk and I.L. Lapitskaya and S.A. Gudoshnikov and Mikko Kiviranta and O.V. Snigirev and L.S. Kuzmin and Heikki Sepp{\"a}",

year = "2003",

language = "English",

volume = "48",

pages = "1404--1409",

journal = "Journal of Communications Technology and Electronics",

issn = "1064-2269",

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TY - JOUR

T1 - A femtoamperemeter based on a superconducting quantum interferometer and a bulk transformer

AU - Tarasov, M.A.

AU - Kalabukhov, A.S.

AU - Kovtonyuk, S.A.

AU - Lapitskaya, I.L.

AU - Gudoshnikov, S.A.

AU - Kiviranta, Mikko

AU - Snigirev, O.V.

AU - Kuzmin, L.S.

AU - Seppä, Heikki

PY - 2003

Y1 - 2003

N2 - A femtoamperemeter based on a superconducting quantum interference device (SQUID) with a planar on-chip gradiometric transformer and an additional volume cryogenic transformer on a toroidal ferromagnetic core is developed, fabricated, and experimentally studied. The conditions for the optimum matching of the SQUID to the signal source are analyzed. It is demonstrated that the conditions for the optimum matching and high coupling coefficient are satisfied in the transformer with a ferromagnetic core. The excess noise introduced by the core is studied experimentally. It is shown that double shielding using superconducting and ferromagnetic shields makes it possible to lower the cutoff frequency of the excess noise to less than 1 kHz.

AB - A femtoamperemeter based on a superconducting quantum interference device (SQUID) with a planar on-chip gradiometric transformer and an additional volume cryogenic transformer on a toroidal ferromagnetic core is developed, fabricated, and experimentally studied. The conditions for the optimum matching of the SQUID to the signal source are analyzed. It is demonstrated that the conditions for the optimum matching and high coupling coefficient are satisfied in the transformer with a ferromagnetic core. The excess noise introduced by the core is studied experimentally. It is shown that double shielding using superconducting and ferromagnetic shields makes it possible to lower the cutoff frequency of the excess noise to less than 1 kHz.

M3 - Article

SN - 1064-2269

VL - 48

SP - 1404

EP - 1409

JO - Journal of Communications Technology and Electronics

JF - Journal of Communications Technology and Electronics

IS - 12

ER -

A femtoamperemeter based on a superconducting quantum interferometer and a bulk transformer

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