| Zugriffsnummer | 16025 |
| Dokumenttyp | Zeitschriftenartikel |
| Sprache | Englisch |
| Titel | Josephson voltage standard circuit operation with a pulse tube cooler |
| Autor(in); Institution |
Wende, Gerd; Institut für Physikalische Hochtechnologie, Jena, GERMANY
Schubert, Marco; Institut für Physikalische Hochtechnologie, Jena, GERMANY
May, Thorsten; Institut für Physikalische Hochtechnologie, Jena, GERMANY
Fritzsch, Ludwig; Institut für Physikalische Hochtechnologie, Jena, GERMANY
Meyer, Hans-Georg; Institut für Physikalische Hochtechnologie, Jena, GERMANY
Thummes, Günter; Universität Gießen, Institut für angewandte Physik, Gießen, GERMANY
Kücükkaplan, Y.; Universität Gießen, Institut für angewandte Physik, Gießen, GERMANY
Qiu, L. M.; Universität Gießen, Institut für angewandte Physik, Gießen, GERMANY
Kohlmann, Johannes; 2.403, Programmierbares Josephson-Spannungsnormal, PTB-Braunschweig
Niemeyer, Jürgen; 2.4, Quantenelektronik, PTB-Braunschweig
Hofmeister, Herbert; PREMA Semiconductor GmbH, Mainz, GERMANY
Scheerer, Joachim; PREMA Semiconductor GmbH, Mainz, GERMANY
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| Quelle/Jahr | IEEE Transactions on Applied Superconductivity: 13 (2003), 2, 915 - 918 |
| ISSN | 1051-8223 |
| Verlag | New York, NY: IEEE |
| Freie Schlagworte | Programmierbares Josephson-Spannungsnormal ; Quantenvoltmeter ; Pulsrohrkühler |
| Zusammenfassung | For a more wide-spread use of Josephson voltage standards, cryogen-free operation, by means of an appropriate closed-cycle refrigerator, is highly desirable. In this work we present a low-noise pulse tube cooler (PTC) that is capable to cool the voltage standard circuits to temperatures below 4 K. As a low loss dielectric waveguide with a very small thermal conductivity a Teflon strip was used for the microwave transmission. The matched transition from the WR12 rectangular waveguide to the Teflon strip and vice versa was made using special exponential tapers. Programmable 1 Volt 14 bit SINIS and 10 Volt SIS arrays assembled in the PTC operated well, similar like under liquid helium cooling conditions. The Josephson junction arrays were integrated in coplanar strips instead of the commonly used microstriplines for the microwave transmission lines. The 1 Volt SINIS array contained 8,192 Josephson junctions (JJs). It generated an inherently stable Josephson voltage step of 1.19 V at a driving microwave frequency of 70 GHz. The step width was 150 μA and the critical current of the junctions was 550 μA. Similar results were obtained under liquid helium cooling conditions. In another experiment a 10 Volt voltage standard chip with 19,700 SIS JJs was installed. It was possible to generate stable Shapiro steps at the 10 V level. |
Zitierung
Wende, G., Schubert, M., May, T., Fritzsch, L., Meyer, H.-G., Thummes, G., Kücükkaplan, Y., Qiu, L. M., Kohlmann, J., Niemeyer, J., Hofmeister, H., & Scheerer, J. (2003). Josephson voltage standard circuit operation with a pulse tube cooler. IEEE Transactions on Applied Superconductivity, 13(2), 915–918.