Two-stage SQUID systems and transducers development for MiniGRAIL

Details Two-stage SQUID systems and transducers development for MiniGRAIL Two-stage SQUID systems and transducers development for MiniGRAIL

Mar 2004

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004cqgra..21s1191g&link_type=abstract

Classical and Quantum Gravity, Volume 21, Issue 5, pp. S1191-S1196 (2004).

Physics

3

Scientific paper

We present measurements on a two-stage SQUID system based on a dc-SQUID as a sensor and a DROS as an amplifier. We measured the intrinsic noise of the dc-SQUID at 4.2 K. A new dc-SQUID has been fabricated. It was specially designed to be used with MiniGRAIL transducers. Cooling fins have been added in order to improve the cooling of the SQUID and the design is optimized to achieve the quantum limit of the sensor SQUID at temperatures above 100 mK. In this paper we also report the effect of the deposition of a Nb film on the quality factor of a small mass Al5056 resonator. Finally, the results of Q-factor measurements on a capacitive transducer for the current MiniGRAIL run are presented.

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