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Cryocooler Operation of a Pulse-Driven AC Josephson Voltage Standard at PTB
Physikalisch-Technische Bundesanstalt, Quantum Electronics, Braunschweig, Germany
Physikalisch-Technische Bundesanstalt, Quantum Electronics, Braunschweig, Germany
Physikalisch-Technische Bundesanstalt, Quantum Electronics, Braunschweig, Germany
- 1 Physikalisch-Technische Bundesanstalt, Quantum Electronics, Braunschweig, Germany
- 2 Physikalisch-Technische Bundesanstalt, Quantum Electronics, Braunschweig, Germany
- 3 Physikalisch-Technische Bundesanstalt, Quantum Electronics, Braunschweig, Germany
World Journal of Condensed Matter Physics·Volume 03 (2013)·Pages 189–193·Published 14 October 2013·DOI10.4236/wjcmp.2013.34031
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Abstract
The PTB Josephson Arbitrary Waveform Synthesizer (JAWS) enables the generation of arbitrary waveforms up to voltages of 70 mV RMS (199 mV PP ) using two Josephson arrays in series containing 4000 Josephson junctions each. The SNS-like double-stacked junctions are based on Nb x Si 1- 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.
KeywordsJosephson Voltage StandardJosephson Arbitrary Waveform Synthesizer (JAWS)SNS Josephson JunctionCryocoolerHelium-Free Setup
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