An advanced inductive transducer for resonant mass gravitational wave detectors

Harry, Gregory M.; Jin, Insik; Paik, Ho Jung; Stevenson, Thomas R.; Wellstood, Frederick C.
June 2000
AIP Conference Proceedings;2000, Vol. 523 Issue 1, p415
Academic Journal
We report on the sensitivity of a transducer which uses a low noise SQUID amplifier. The transducer is made of niobium and was electropolished and heat treated to improve the Qs. The mechanical Q was found to be 3.15×10[sup 6] at 4 K and the electrical Q was 2.52×10[sup 5]. With a low noise SQUID designed for this transducer, the noise temperature of the transducer was found to be 1.1 mK, of which 0.7 mK was due to the SQUID. This is about 200× larger than the expected noise from the SQUID. Noise from flux trapped on the chip is the most likely cause. © 2000 American Institute of Physics.


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