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Toroidal DC SQUIDs with point-contact junctions

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3 Author(s)
Paik, H.J. ; University of Maryland, College Park ; Mathews, R.H. ; Castellano, M.

The well-developed technique of a toroidal point-contact rf SQUID has been extended to a dc SQUID. Two point-contacts are made on the symmetry axis of the toroid. A large Nb cavity containing a signal coil is connected to the junctions via a narrow gap. Such geometry allows good coupling of the SQUID to a high-inductance signal coil without increasing the effective SQUID inductance at the Josephson frequency. It is expected that both the shot-noise-limit performance and a high signal coupling will be achieved in this SQUID. We discuss the status of design and the result of preliminary test of the device.

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Magnetics, IEEE Transactions on  (Volume:17 ,  Issue: 1 )