Abstract
One requirement for good rf-SQUID operation is a coupling between SQUID-ring and tank circuit with k2Q≈1. For typical bulk SQUID structures of high-Tc materials, however k2Q<1 usually is found experimentally, when using a copper coil at 77 K for the tank circuit and a resonance frequency near 20 MHz. We therefore investigated the operation of high-Tc rf-SQUIDs where the damping of the tank circuit was reduced by a positive feedback circuit in order to achieve k2Q≥1. The reduction of damping leads to noise reduction. The SQUID can be operated without external rf-oscillator solely driven by the tank circuit noise. This elimination of the oscillator leads to a simplified compact “SQUID-STICK”.
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References
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© 1992 Springer-Verlag Berlin Heidelberg
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Zhang, Y., Heiden, C. (1992). A Compact High-T c RF-SQUID System with Reduced Tank Circuit Damping. In: Koch, H., Lübbig, H. (eds) Superconducting Devices and Their Applications. Springer Proceedings in Physics, vol 64. Springer, Berlin, Heidelberg. https://doi.org/10.1007/978-3-642-77457-7_14
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DOI: https://doi.org/10.1007/978-3-642-77457-7_14
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