Low-noise SQUIDs with large transfer: two-stage SQUIDs based on DROSs

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Podt, M. and Flokstra, J. and Rogalla, H. (2002) Low-noise SQUIDs with large transfer: two-stage SQUIDs based on DROSs. Physica C: Superconductivity, 372-37 (Part 1). pp. 225-228. ISSN 0921-4534

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Abstract:We have realized a two-stage integrated superconducting quantum interference device (SQUID) system with a closed loop bandwidth of 2.5 MHz, operated in a direct voltage readout mode. The corresponding flux slew rate was 1.3×105 Φ0/s and the measured white flux noise was 1.3 μΦ0/√Hz at 4.2 K. The system is based on a conventional dc SQUID with a double relaxation oscillation SQUID (DROS) as the second stage. Because of the large flux-to-voltage transfer, the sensitivity of the system is completely determined by the sensor SQUID and not by the DROS or the room-temperature preamplifier. Decreasing the Josephson junction area enables a further improvement of the sensitivity of the two-stage SQUID systems.
Item Type:Article
Copyright:© 2002 Elsevier
Faculty:
Science and Technology (TNW)
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Link to this item:http://purl.utwente.nl/publications/74718
Official URL:http://dx.doi.org/10.1016/S0921-4534(02)00676-7
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