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26 April 2024

» arxiv » cond-mat/9910337

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Two stage superconducting quantum interference device amplifier in a high-Q gravitational wave transducer
Gregory M. Harry ; Insik Jin ; Ho Jung Paik ; Thomas R. Stevenson ; Frederick C. Wellstood ;
Date:	21 Oct 1999
Subject:	Superconductivity; Instrumentation and Detectors \| cond-mat.supr-con gr-qc physics.ins-det
Abstract:	We report on the total noise from an inductive motion transducer for a gravitational-wave antenna. The transducer uses a two-stage SQUID amplifier and has a noise temperature of 1.1 mK, of which 0.70 mK is due to back-action noise from the SQUID chip. The total noise includes thermal noise from the transducer mass, which has a measured Q of 2.60 X 10^6. The noise temperature exceeds the expected value of 3.5 mu K by a factor of 200, primarily due to voltage noise at the input of the SQUID. Noise from flux trapped on the chip is found to be the most likely cause.
Source:	arXiv, cond-mat/9910337
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