Elsevier

Cryogenics

Volume 37, Issue 3, March 1997, Pages 139-151
Cryogenics

Paper
Cryogenic design of a high-Tc SQUID-based heart scanner cooled by small Stirling cryocoolers

https://doi.org/10.1016/S0011-2275(96)00115-4Get rights and content

Abstract

A heart scanner based on high-Tc SQUIDs is currently under development at the University of Twente. It is intended to be used in standard clinical environments without a magnetically shielded room. In order to make the application simple to use, the SQUIDs will be cooled by small cryocoolers, thus realizing a turnkey apparatus. The aimed field resolution is 50 fTRMS Hz12 in a measuring band of 0.1–100 Hz. The mechanical cooler interference is reduced by incorporating two coolers and operating them in counter phase. The magnetic cooler interference is reduced by positioning the coolers and the SQUIDs in a coplanar arrangement, and by separating the SQUIDs from the cold tips with a solid conducting thermal interface. A design is presented in which a temperature of 55 K is expected with a cool-down time of less than 1 h.

References (35)

  • H.J.M. ter Brake et al.

    New results in active noise compensation for magnetically shielded rooms

    Meas. Sci. Technol.

    (1993)
  • H.J.M. ter Brake et al.

    Design aspects of a high-Tc SQUID based heart scanner

  • ter Brake, H.J.M., Aarnink, W.A.M., ven den Bosch, P.J., Hilgenkamp, J.W.M., Flokstra, J. and Rogalla, H., Temperature...
  • Scurlock, R.G. (University of Southampton, UK), private communication on temperature fluctuations in boiling liquid...
  • R.R. Clappier et al.

    Precision temperature control of Stirling-cycle cryocoolers

    Adv. Cryog. Engng

    (1994)
  • D. Verbeek et al.

    Performance of the Signaal Usfa Stirling cooling engines

  • Signaal Usfa, PO Box 6034, 5600 HA Eindhoven, The Netherlands, private...
  • Cited by (0)

    View full text