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Modeling the behavior of HTS terahertz RSQUIDs

Pegrum, C. M. and Macfarlane, J. C. and Du, J. (2011) Modeling the behavior of HTS terahertz RSQUIDs. IEEE Transactions on Applied Superconductivity, 21 (3). pp. 349-353. ISSN 1051-8223

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Abstract

In previous work we looked in detail at simulations of our HTS Resistive DC SQUIDs (RSQUIDs) using a lumped-component model and neglecting step-edge junction capacitance. These can now be made with junctions that have a high product of critical current and normal resistance (IcRJ) and so the Josephson frequency can be above 1 THz. This calls for a more refined model of the device, which we will present here. The RSQUID series resistor is represented as a distributed combination of resistance and inductance, rather than simply a resistor in series with its self inductance. We now include junction capacitance, as the Stewart-McCumber parameter can be close to unity. We treat the RSQUID loop as a co-planar stripline, rather than as an inductor. We report a range of simulations with these enhancements to the model and comment briefly on the results in relation to potential applications of RSQUIDs as active microwave devices.