A Low-Noise Seven-Channel DC SQUID Magnetometer for Brain Research

Matti Kajola; Seppo Ahlfors; Antti Ahonen; Jari Hällström; Jukka Knuutila; Olli V. Lounasmaa; Claudia Tesche; Visa Vilkman

doi:10.7567/JJAPS.26S3.1555

A Low-Noise Seven-Channel DC SQUID Magnetometer for Brain Research

Matti Kajola
, Seppo Ahlfors
, Antti Ahonen
, Jari Hällström
, Jukka Knuutila
, Olli V. Lounasmaa
, Claudia Tesche
, Visa Vilkman

Not published at VTT

Aalto University
IBM (United States)

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

Abstract

The design, construction, and performance of a high-sensitivity DC SQUID magnetometer, covering a circular area of 93 mm diameter, is described. The device, now used routinely in our brain research, comprises seven asymmetric first-order gradiometers, located on a spherical surface of 125 mm radius and with the symmetry axis tilted 30° in respect to the vertical. The overall field sensitivity of the system, measured inside our magnetically shielded room, is 5 - 6 fT/√Hz, mainly caused by thermal noise in the radiation shields of the dewar.

Original language	English
Pages (from-to)	1555-1556
Number of pages	2
Journal	Japanese Journal of Applied Physics
Volume	26
Issue number	S3-2
DOIs	https://doi.org/10.7567/JJAPS.26S3.1555
Publication status	Published - Jan 1987
MoE publication type	A1 Journal article-refereed

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title = "A Low-Noise Seven-Channel DC SQUID Magnetometer for Brain Research",

abstract = "The design, construction, and performance of a high-sensitivity DC SQUID magnetometer, covering a circular area of 93 mm diameter, is described. The device, now used routinely in our brain research, comprises seven asymmetric first-order gradiometers, located on a spherical surface of 125 mm radius and with the symmetry axis tilted 30° in respect to the vertical. The overall field sensitivity of the system, measured inside our magnetically shielded room, is 5 - 6 fT/√Hz, mainly caused by thermal noise in the radiation shields of the dewar.",

author = "Matti Kajola and Seppo Ahlfors and Antti Ahonen and Jari H{\"a}llstr{\"o}m and Jukka Knuutila and Lounasmaa, \{Olli V.\} and Claudia Tesche and Visa Vilkman",

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doi = "10.7567/JJAPS.26S3.1555",

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AU - Kajola, Matti

AU - Ahlfors, Seppo

AU - Ahonen, Antti

AU - Hällström, Jari

AU - Knuutila, Jukka

AU - Lounasmaa, Olli V.

AU - Tesche, Claudia

AU - Vilkman, Visa

PY - 1987/1

Y1 - 1987/1

N2 - The design, construction, and performance of a high-sensitivity DC SQUID magnetometer, covering a circular area of 93 mm diameter, is described. The device, now used routinely in our brain research, comprises seven asymmetric first-order gradiometers, located on a spherical surface of 125 mm radius and with the symmetry axis tilted 30° in respect to the vertical. The overall field sensitivity of the system, measured inside our magnetically shielded room, is 5 - 6 fT/√Hz, mainly caused by thermal noise in the radiation shields of the dewar.

AB - The design, construction, and performance of a high-sensitivity DC SQUID magnetometer, covering a circular area of 93 mm diameter, is described. The device, now used routinely in our brain research, comprises seven asymmetric first-order gradiometers, located on a spherical surface of 125 mm radius and with the symmetry axis tilted 30° in respect to the vertical. The overall field sensitivity of the system, measured inside our magnetically shielded room, is 5 - 6 fT/√Hz, mainly caused by thermal noise in the radiation shields of the dewar.

UR - https://www.scopus.com/pages/publications/84956119116

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EP - 1556

JO - Japanese Journal of Applied Physics

JF - Japanese Journal of Applied Physics

IS - S3-2

ER -

A Low-Noise Seven-Channel DC SQUID Magnetometer for Brain Research

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