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.
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