Design of a 7-channel DC-SQUID gradiometer for brain research

Alpo I. Ahonen; Jari K. Hällström; M. J. Kajola; J. E. Knuutila; C. D. Tesche; V. A. Vilkman

Design of a 7-channel DC-SQUID gradiometer for brain research

Alpo I. Ahonen^*
, Jari K. Hällström
, M. J. Kajola
, J. E. Knuutila
, C. D. Tesche
, V. A. Vilkman

^*Corresponding author for this work

Not published at VTT

Helsinki University of Technology
Aalto University

Research output: Chapter in Book/Report/Conference proceeding › Conference article in proceedings › Scientific › peer-review

4 Citations (Scopus)

Abstract

The design of a 7-channel DC-SQUID gradiometer system for brain research is discussed. The system is based on high-quality DC-SQUIDs made by IBM. The flux transformer system consists of seven identical wire-wound asymmetric axial first order gradiometers in a hexagonal array. The pickup loop diameter is 20 mm, and the base length 60 mm. The lower ends of the gradiometers are on the curved bottom surface of a dewar with a 125 mm radius of curvature. The diameter of the active measurement area is 94 mm. The DC-SQUIDs are matched to FET preamplifiers using superconducting resonant transformers. The preamplifiers are connected to detector/controller units located in a separate RF-shielded cabinet outside of the magnetically shielded room. The digitized outputs of the detectors are sent to a set of signal processors via a fiber optic link.

Original language	English
Title of host publication	Proceedings of the International Cryogenic Engineering Conference, ICEC 11
Editors	Gustav Klipping, Ingrid Klipping
Publisher	Butterworth-Heinemann
Pages	820-824
ISBN (Print)	0-408-01258-7
Publication status	Published - 1 Dec 1986
MoE publication type	A4 Article in a conference publication

Cite this

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title = "Design of a 7-channel DC-SQUID gradiometer for brain research",

abstract = "The design of a 7-channel DC-SQUID gradiometer system for brain research is discussed. The system is based on high-quality DC-SQUIDs made by IBM. The flux transformer system consists of seven identical wire-wound asymmetric axial first order gradiometers in a hexagonal array. The pickup loop diameter is 20 mm, and the base length 60 mm. The lower ends of the gradiometers are on the curved bottom surface of a dewar with a 125 mm radius of curvature. The diameter of the active measurement area is 94 mm. The DC-SQUIDs are matched to FET preamplifiers using superconducting resonant transformers. The preamplifiers are connected to detector/controller units located in a separate RF-shielded cabinet outside of the magnetically shielded room. The digitized outputs of the detectors are sent to a set of signal processors via a fiber optic link.",

author = "Ahonen, \{Alpo I.\} and H{\"a}llstr{\"o}m, \{Jari K.\} and Kajola, \{M. J.\} and Knuutila, \{J. E.\} and Tesche, \{C. D.\} and Vilkman, \{V. A.\}",

year = "1986",

month = dec,

day = "1",

language = "English",

isbn = "0-408-01258-7 ",

pages = "820--824",

editor = "Gustav Klipping and Ingrid Klipping",

booktitle = "Proceedings of the International Cryogenic Engineering Conference, ICEC 11",

publisher = "Butterworth-Heinemann",

address = "United Kingdom",

}

Design of a 7-channel DC-SQUID gradiometer for brain research. / Ahonen, Alpo I.; Hällström, Jari K.; Kajola, M. J. et al.
Proceedings of the International Cryogenic Engineering Conference, ICEC 11. ed. / Gustav Klipping; Ingrid Klipping. Butterworth-Heinemann, 1986. p. 820-824.

Research output: Chapter in Book/Report/Conference proceeding › Conference article in proceedings › Scientific › peer-review

TY - GEN

T1 - Design of a 7-channel DC-SQUID gradiometer for brain research

AU - Ahonen, Alpo I.

AU - Hällström, Jari K.

AU - Kajola, M. J.

AU - Knuutila, J. E.

AU - Tesche, C. D.

AU - Vilkman, V. A.

PY - 1986/12/1

Y1 - 1986/12/1

N2 - The design of a 7-channel DC-SQUID gradiometer system for brain research is discussed. The system is based on high-quality DC-SQUIDs made by IBM. The flux transformer system consists of seven identical wire-wound asymmetric axial first order gradiometers in a hexagonal array. The pickup loop diameter is 20 mm, and the base length 60 mm. The lower ends of the gradiometers are on the curved bottom surface of a dewar with a 125 mm radius of curvature. The diameter of the active measurement area is 94 mm. The DC-SQUIDs are matched to FET preamplifiers using superconducting resonant transformers. The preamplifiers are connected to detector/controller units located in a separate RF-shielded cabinet outside of the magnetically shielded room. The digitized outputs of the detectors are sent to a set of signal processors via a fiber optic link.

AB - The design of a 7-channel DC-SQUID gradiometer system for brain research is discussed. The system is based on high-quality DC-SQUIDs made by IBM. The flux transformer system consists of seven identical wire-wound asymmetric axial first order gradiometers in a hexagonal array. The pickup loop diameter is 20 mm, and the base length 60 mm. The lower ends of the gradiometers are on the curved bottom surface of a dewar with a 125 mm radius of curvature. The diameter of the active measurement area is 94 mm. The DC-SQUIDs are matched to FET preamplifiers using superconducting resonant transformers. The preamplifiers are connected to detector/controller units located in a separate RF-shielded cabinet outside of the magnetically shielded room. The digitized outputs of the detectors are sent to a set of signal processors via a fiber optic link.

UR - https://www.scopus.com/pages/publications/0022940832

M3 - Conference article in proceedings

AN - SCOPUS:0022940832

SN - 0-408-01258-7

SP - 820

EP - 824

BT - Proceedings of the International Cryogenic Engineering Conference, ICEC 11

A2 - Klipping, Gustav

A2 - Klipping, Ingrid

PB - Butterworth-Heinemann

ER -

Design of a 7-channel DC-SQUID gradiometer for brain research

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