TITLE

Dc superconducting quantum interference device amplifier for gravitational wave detectors with a true noise temperature of 16 μK

AUTHOR(S)
Vinante, Andrea; Mezzena, Renato; Prodi, Giovanni Andrea; Vitale, Stefano; Cerdonio, Massimo; Falferi, Paolo; Bonaldi, Michele
PUB. DATE
October 2001
SOURCE
Applied Physics Letters;10/15/2001, Vol. 79 Issue 16, p2597
SOURCE TYPE
Academic Journal
DOC. TYPE
Article
ABSTRACT
We report on the noise characterization of a two-stage dc superconducting quantum interference device (SQUID) amplifier developed for resonant gravitational wave detectors. The back action noise is estimated by coupling the SQUID to an electrical resonator at 1.6 kHz with Q=1.1×10[sup 6]. From measurements of back action and additive SQUID noise, performed in the temperature range 1.5–4.2 K, an upper limit is set on the noise temperature T[sub n] of the device at the resonator frequency. The best value obtained at 1.5 K is T[sub n]≤16 μK and corresponds to 200 resonator quanta. The thermal component of the noise temperature is found in reasonable agreement with the predicted value. © 2001 American Institute of Physics.
ACCESSION #
5319204

 

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