Cryocooler Operation of a Pulse-Driven AC Josephson Voltage Standard at PTB

Oliver F. O. Kieler; Thomas Scheller; Johannes Kohlmann

doi:10.4236/wjcmp.2013.34031

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Cryocooler Operation of a Pulse-Driven AC Josephson Voltage Standard at PTB

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DOI: 10.4236/wjcmp.2013.34031 2,860 Downloads 4,600 Views Citations

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Oliver F. O. Kieler, Thomas Scheller, Johannes Kohlmann

Affiliation(s)

Physikalisch-Technische Bundesanstalt, Quantum Electronics, Braunschweig, Germany.

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_xSi_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.

KEYWORDS

Josephson Voltage Standard; Josephson Arbitrary Waveform Synthesizer (JAWS); SNS Josephson Junction; Cryocooler; Helium-Free Setup

Conflicts of Interest

The authors declare no conflicts of interest.

Cite this paper

Kieler, O. , Scheller, T. and Kohlmann, J. (2013) Cryocooler Operation of a Pulse-Driven AC Josephson Voltage Standard at PTB. World Journal of Condensed Matter Physics, 3, 189-193. doi: 10.4236/wjcmp.2013.34031.

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