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Measurement

Characterization of a Josephson array for pulse-driven voltage standard in a cryocooler

A. Sosso, Paolo Durandetto, Bruno Trinchera, Oliver Kieler, Ralf Behr, J. Kohlmann

Published Sep 23, 2016• 10 citations
Publisher
DOI
10.1016/j.measurement.2016.09.039

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The development of pulse driven Josephson arrays has led to devices capable of generating quantum referenced arbitrary and ultra pure voltages with amplitudes exceeding 2 V. The optical driving of pulses was shown to have several advantages with respect to electrical methods. On the other hand, cryocooler operation of Josephson standards is promising to simplify cryogenic management and improve output signal transmission. A novel optical interface designed for cryocooler operation is presented and the results of first tests are discussed.
The PTB Josephson Arbitrary Waveform Synthesizer (JAWS) enables the generation of arbitrary waveforms up to voltages of 70 mVRMS (199 mVPP) using two Josephson arrays in series containing 4000 Josephson junctions each. The SNS-like double-stacked junctions are based on NbxSi1-x as barrier material. While the JAWS system is typically operated using a Dewar with liquid helium, the operation in a closed-cycle pulse-tube cryocooler at temperatures around 4.2 K range was here investigated and successfully demonstrated. For this purpose a special designed cryoprobe was used to provide high quality pulses to the Josephson arrays.