Zobrazeno 1 - 10
of 21
pro vyhledávání: '"R. Wendisch"'
Publikováno v:
IEEE Transactions on Applied Superconductivity. 31:1-5
We developed a fabrication process to establish large arrays of up to 5-stacked Josephson junctions for the Josephson Arbitrary Waveform Synthesizer (JAWS). SNS-type Josephson junctions with NbxSi1-x barriers are used for this application. By modifyi
Autor:
Ralf Behr, Hao Tian, R. Wendisch, Oliver Kieler, Johannes Kohlmann, Karsten Kuhlmann, Rolf-Werner Gerdau
Publikováno v:
IEEE Transactions on Applied Superconductivity. 30:1-5
To make the experimental setup of the Josephson arbitrary waveform synthesizer less complex by reducing the number of RF cables between room and cryogenic temperature, we developed on-chip RF power dividers. By integration of these components, we can
Autor:
Jane Ireland, Per Ohlckers, Eivind Bardalen, R. Wendisch, Bjornar Karlsen, Oliver Kieler, Luis Palafox, Muhammad Nadeem Akram, Jonathan M. Williams, Helge Malmbekk, Ralf Behr
Publikováno v:
IEEE Transactions on Applied Superconductivity. 29:1-5
We developed an optical pulse-drive for the operation of the Josephson Arbitrary Waveform Synthesizer (JAWS) using a fast photodiode (PD) operated at 4 K, close to the JAWS chip. The optical pulses are transmitted to the PD by an easily removable opt
Autor:
Per Ohlckers, Hao Tian, Rolf-Werner Gerdau, Ralf Behr, Helge Malmbekk, Johannes Kohlmann, Jonathan M. Williams, Jane Ireland, Muhammed Nadeem Akram, Luis Palafox, B. Karlsen, Oliver Kieler, R. Wendisch, Eivind Bardalen
Publikováno v:
2019 IEEE International Superconductive Electronics Conference (ISEC).
The pulse-driven Josephson Voltage Standard, also called Josephson Arbitrary Waveform Synthesizer (JAWS) is already well established for different applications in AC voltage metrology. To further increase the output voltage towards 10 V and to reduce
Publikováno v:
2018 Conference on Precision Electromagnetic Measurements (CPEM 2018).
Series arrays of overdamped Josephson junctions compose the basis of AC Josephson voltage standards. Presently, an advanced technology is based on Josephson junctions consisting of an NbxSi -x barrier. Using junction stacks containing five Josephson
Publikováno v:
IEEE Transactions on Applied Superconductivity. 25:1-5
The establishment at PTB of an AC Josephson voltage standard (Josephson Arbitrary Waveform Synthesizer- JAWS) based on pulse-driven Josephson arrays is focused on achieving an output voltage of at least 1 Vrms which is required for many metrology app
Publikováno v:
2016 Conference on Precision Electromagnetic Measurements (CPEM 2016).
AC Josephson voltage standards are typically based on series arrays of overdamped Josephson junctions, which are presently realized using an Nb x Si 1-x barrier at PTB. The characteristic parameters of these SNS-like junctions can be tuned by the Nb
Publikováno v:
IEEE Transactions on Applied Superconductivity. 17:649-652
Recent metrological activities with programmable Josephson voltage standards (PJVS) are focused on extending the quantum accuracy to AC voltages, e.g. for the step-wise approximation of sine waves. Stimulated by the progress in this field, new requir
Publikováno v:
29th Conference on Precision Electromagnetic Measurements (CPEM 2014).
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