| Zugriffsnummer | 21091 |
| Dokumenttyp | Konferenzartikel in Zeitschrift |
| Sprache | Englisch |
| Titel | Improved design of SNS Josephson junction series arrays for an ac Josephson voltage standard [poster] |
| Autor(in); Institution |
Kieler, Oliver; 2.4, Quantenelektronik, PTB-Braunschweig
Kohlmann, Johannes; 2.4, Quantenelektronik, PTB-Braunschweig
Müller, Franz; 2.4, Quantenelektronik, PTB-Braunschweig
|
| Quelle/Jahr | Superconductor Science and Technology: 20 (2007), S318 - S322 |
| ISSN | 0953-2048 |
| DOI | |
| Verlag | Bristol [u.a.]: IOPP |
| Konferenzangaben | 11th International Superconductive Electronics Conference ISEC, Washington, DC, 10-14, June, 2007, USA |
| Freie Schlagworte | AC Josephson voltage standard ; Josephson arbitrary waveform synthesizer ; SNS Josephson junctions |
| Zusammenfassung | SNS Josephson junction series arrays are the subject of research for the realization of a Josephson Arbitrary Waveform Synthesizer (JAWS) based on pulse-driven Josephson junctions. Lumped arrays of Superconductor / Normal conductor / Superconductor (SNS) Josephson junctions are investigated for this application at PTB. The series arrays consisting of Nb/HfTi/Nb SNS junctions are embedded in the center line of a coplanar waveguide transmission line. To increase the AC output voltage, the Josephson junction series array is designed as a meander-like structure. A broadband response of the arrays is required for the complex pulse operation of the JAWS. The arrays are investigated by DC measurements and for test purposes under continuous microwave irradiation at different frequencies. Flat Shapiro steps were measured for meander-like series arrays with 21 parallel lines containing up to 10,752 junctions. A sine wave with a frequency of 2.5 kHz and a peak voltage of 214 mVPeak was synthesized under pulse mode operation. |
