Construction and tests of a high-Tc SQUID-based heart scanner cooled by small Stirling cryocoolers

C.J.H.A. Blom; Hermanus J.M. ter Brake; Herman J. Holland; A.P. Rijpma; Horst Rogalla

doi:10.1007/0-306-47090-X_99

Construction and tests of a high-Tc SQUID-based heart scanner cooled by small Stirling cryocoolers

C.J.H.A. Blom, Hermanus J.M. ter Brake, Herman J. Holland, A.P. Rijpma, Horst Rogalla

Research output: Chapter in Book/Report/Conference proceeding › Conference contribution › Academic › peer-review

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Abstract

A heart scanner that can be equipped with up to 25 high-Tc SQUID magnetometers was designed at the University of Twente. In this design the mechanical cooler interference is reduced by operating two coolers in counterphase. The magnetic cooler interference diminished by positioning the coolers and the SQUIDs in a coplanar arrangement, and by separating the SQUIDs from the cold tips of the cryocoolers with a solid conducting thermal interface. In the present paper the construction of this cryogen-free high-Tc SQUID system is described and test results are presented. A SQUID plate temperature of 60 K was realized in about 2 hours. The corresponding heat load to the coolers is roughly 0.9 W. With a preliminary magnetic shield around the compressors a noise level of 0.6 pT/√Hz was measured in the frequency band 10 to 100 Hz and magnetocardiograms were recorded inside a magnetically shielded room. A further reduction of the noise level is expected after optimizing the mumetal shielding of the compressors.

Original language	Undefined
Title of host publication	Proceedings International Cryocooler Conference, Cryocoolers 10, eds. R.G. Ross jr.
Editors	R.G. Ross
Place of Publication	Monterey, Californie
Pages	837-846
Number of pages	10
DOIs	https://doi.org/10.1007/0-306-47090-X_99
Publication status	Published - 23 Jun 1999
Event	10th International Cryocooler Conference, Cryocoolers-10 1998 - Monterey, United States Duration: 26 May 1998 → 28 May 1998 Conference number: 10

Conference

Conference	10th International Cryocooler Conference, Cryocoolers-10 1998
Abbreviated title	Cryocoolers
Country/Territory	United States
City	Monterey
Period	26/05/98 → 28/05/98

Keywords

METIS-130404
IR-60934

Access to Document

10.1007/0-306-47090-X_99

Cite this

@inproceedings{d4e53c101c2f4bf6b7c47bb4e51bf51f,

title = "Construction and tests of a high-Tc SQUID-based heart scanner cooled by small Stirling cryocoolers",

abstract = "A heart scanner that can be equipped with up to 25 high-Tc SQUID magnetometers was designed at the University of Twente. In this design the mechanical cooler interference is reduced by operating two coolers in counterphase. The magnetic cooler interference diminished by positioning the coolers and the SQUIDs in a coplanar arrangement, and by separating the SQUIDs from the cold tips of the cryocoolers with a solid conducting thermal interface. In the present paper the construction of this cryogen-free high-Tc SQUID system is described and test results are presented. A SQUID plate temperature of 60 K was realized in about 2 hours. The corresponding heat load to the coolers is roughly 0.9 W. With a preliminary magnetic shield around the compressors a noise level of 0.6 pT/√Hz was measured in the frequency band 10 to 100 Hz and magnetocardiograms were recorded inside a magnetically shielded room. A further reduction of the noise level is expected after optimizing the mumetal shielding of the compressors.",

keywords = "METIS-130404, IR-60934",

author = "C.J.H.A. Blom and {ter Brake}, {Hermanus J.M.} and Holland, {Herman J.} and A.P. Rijpma and Horst Rogalla",

year = "1999",

month = jun,

day = "23",

doi = "10.1007/0-306-47090-X_99",

language = "Undefined",

isbn = "0-306-46120-x",

pages = "837--846",

editor = "R.G. Ross",

booktitle = "Proceedings International Cryocooler Conference, Cryocoolers 10, eds. R.G. Ross jr.",

note = "10th International Cryocooler Conference, Cryocoolers-10 1998 ; Conference date: 26-05-1998 Through 28-05-1998",

}

Blom, CJHA, ter Brake, HJM , Holland, HJ, Rijpma, AP & Rogalla, H 1999, Construction and tests of a high-Tc SQUID-based heart scanner cooled by small Stirling cryocoolers. in RG Ross (ed.), Proceedings International Cryocooler Conference, Cryocoolers 10, eds. R.G. Ross jr.. Monterey, Californie, pp. 837-846, 10th International Cryocooler Conference, Cryocoolers-10 1998, Monterey, California, United States, 26/05/98. https://doi.org/10.1007/0-306-47090-X_99

Construction and tests of a high-Tc SQUID-based heart scanner cooled by small Stirling cryocoolers. / Blom, C.J.H.A.; ter Brake, Hermanus J.M.; Holland, Herman J. et al.
Proceedings International Cryocooler Conference, Cryocoolers 10, eds. R.G. Ross jr.. ed. / R.G. Ross. Monterey, Californie, 1999. p. 837-846.

Research output: Chapter in Book/Report/Conference proceeding › Conference contribution › Academic › peer-review

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AU - ter Brake, Hermanus J.M.

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AU - Rijpma, A.P.

AU - Rogalla, Horst

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N2 - A heart scanner that can be equipped with up to 25 high-Tc SQUID magnetometers was designed at the University of Twente. In this design the mechanical cooler interference is reduced by operating two coolers in counterphase. The magnetic cooler interference diminished by positioning the coolers and the SQUIDs in a coplanar arrangement, and by separating the SQUIDs from the cold tips of the cryocoolers with a solid conducting thermal interface. In the present paper the construction of this cryogen-free high-Tc SQUID system is described and test results are presented. A SQUID plate temperature of 60 K was realized in about 2 hours. The corresponding heat load to the coolers is roughly 0.9 W. With a preliminary magnetic shield around the compressors a noise level of 0.6 pT/√Hz was measured in the frequency band 10 to 100 Hz and magnetocardiograms were recorded inside a magnetically shielded room. A further reduction of the noise level is expected after optimizing the mumetal shielding of the compressors.

AB - A heart scanner that can be equipped with up to 25 high-Tc SQUID magnetometers was designed at the University of Twente. In this design the mechanical cooler interference is reduced by operating two coolers in counterphase. The magnetic cooler interference diminished by positioning the coolers and the SQUIDs in a coplanar arrangement, and by separating the SQUIDs from the cold tips of the cryocoolers with a solid conducting thermal interface. In the present paper the construction of this cryogen-free high-Tc SQUID system is described and test results are presented. A SQUID plate temperature of 60 K was realized in about 2 hours. The corresponding heat load to the coolers is roughly 0.9 W. With a preliminary magnetic shield around the compressors a noise level of 0.6 pT/√Hz was measured in the frequency band 10 to 100 Hz and magnetocardiograms were recorded inside a magnetically shielded room. A further reduction of the noise level is expected after optimizing the mumetal shielding of the compressors.

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BT - Proceedings International Cryocooler Conference, Cryocoolers 10, eds. R.G. Ross jr.

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