Construction and test of a cryocooler-cooled low-Tc SQUID gradiometer system

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Rijpma, A.P. and Krooshoop, H.J.G. and Lefevere, M.W. and Leeuwen van, E.P. and Holland, H.J. and Haken ten, B. and Brake ter, H.J.M. (2008) Construction and test of a cryocooler-cooled low-Tc SQUID gradiometer system. Cryogenics, 48 (1-2). pp. 61-67. ISSN 0011-2275

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Abstract:A cryocooler-cooled low-Tc SQUID gradiometer system was designed and constructed. It is based on a 4 K GM-cooler that is positioned several meters from the measuring head containing the SQUID sensors. The cooling power is transported by means of a circulating helium flow. Thus, there are three main components: the cooler vessel, the measuring head and the connecting flow-line.
In stable operation, the SQUID and gradiometric pick-up loop are about 4.3 K. The overall heat loads to the cooler 1st and 2nd stages are estimated at 17 W and 0.3 W, respectively. The overall system noise was about 10 fT/√Hz although a number of peaks were observed in the spectrum. As an example, an adult heart beat was recorded.

Item Type:Article
Copyright:© 2008 Elsevier
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Science and Technology (TNW)
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Link to this item:http://purl.utwente.nl/publications/60318
Official URL:http://dx.doi.org/10.1016/j.cryogenics.2007.11.004
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