Stabilization and optimization of a two-stage dc SQUID coupled to a high Q resonator

  • Vinante A
  • Bonaldi M
  • Falferi P
 et al. 
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A two-stage dc SQUID is strongly coupled to an electrical resonator at 1.6 kHz with quality factor Q=1.1 × 106in order to simulate the behaviour of the SQUID on a resonant gravitational wave detector. A capacitive damping network is successfully employed in order to avoid the instabilities due to the real part of the SQUID dynamic input impedance. The coupled energy resolution is 300 ℏ at 4.2 K, scales with temperature, and is not significantly worsened by the coupling to the resonator and by the damping network. © 2001 Elsevier Science B.V. All rights reserved.

Author-supplied keywords

  • Gravitational wave detector
  • High Q resonator
  • dc SQUID

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  • Andrea Vinante

  • Michele Bonaldi

  • Paolo Falferi

  • Massimo Cerdonio

  • Renato Mezzena

  • Giovanni Andrea Prodi

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