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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    Titel :

    Construction and Tests of a High-Tc SQUID-Based Heart Scanner Cooled by Small Stirling Cryocoolers


    Beteiligte:
    Ross, R. G. (Herausgeber:in) / Blom, C.J.H.A. (Autor:in) / ter Brake, H.J.M. (Autor:in) / Holland, H.J. (Autor:in) / Rijpma, A.P. (Autor:in) / Rogalla, H. (Autor:in)

    Erschienen in:

    Cryocoolers 10 ; Kapitel : 99 ; 837-846


    Erscheinungsdatum :

    2002-01-01


    Format / Umfang :

    10 pages




    Medientyp :

    Aufsatz/Kapitel (Buch)


    Format :

    Elektronische Ressource


    Sprache :

    Englisch




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    Blom, C. J. H. A. / ter Brake, H. J. M. / Holland, H. J. et al. | British Library Conference Proceedings | 1999


    Numerical Modeling of Stirling Cryocoolers

    Bauwens, L. / AIAA | British Library Conference Proceedings | 1994


    Numerical Modeling of Stirling Cryocoolers

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    Performance Investigation of Stirling-Type Nonmagnetic and Nonmetallic Pulse Tube Cryocoolers for High-Tc SQUID Operation

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