Experimental Study and Time-domain Analysis of Microwave Resonances of a Transformer-coupled DC SQUID at Different Temperatures
Résumé
Measurements of the I-V curves of DC Superconducting Quantum Interference Devices (DC-SQUIDs) can show unexpected resonances that reduce their performance. They can be due to capacitive couplings in the circuitry of the magnetic field capturing loop. We developed a compact model of the SQUID circuitry associated to time-domain simulations to compare with experimental measurements performed for temperatures from 3K to 5K in an unshielded closed-cycle GM cooler. An RCSJ model is used for the Josephson junctions, while microstrip lines make use of a CLC π-model. It is seen that parasitic capacitances must be considered with time-domain simulations to account for experimentally observed resonances. A more accurate model is still necessary to find a quantitative match for the resonances frequencies.
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