Present performance and future upgrades of the AURIGA capacitive readout

Details Present performance and future upgrades of the AURIGA capacitive readout Present performance and future upgrades of the AURIGA capacitive readout

Apr 2006

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006cqgra..23s.103v&link_type=abstract

Classical and Quantum Gravity, Volume 23, Issue 8, pp. S103-S110 (2006).

Physics

9

Scientific paper

The resonant bar gravitational wave detector AURIGA is taking data for its second run at T = 4.5 K. The readout has been largely upgraded with respect to the previous run. In particular, we have realized a 3-mode detection scheme by tuning the high-Q resonance of the electrical readout to the mechanical modes of bar and transducer. Moreover, a low noise two-stage SQUID amplifier has been implemented. Thanks to these improvements, the bandwidth has been largely increased and the strain sensitivity is now better than 10-20 Hz-1/2 over more than 100 Hz. In this paper, we describe a 3-mode model of the detector, which allows us to distinguish between the different noise contributions. Some possible upgrades are discussed.

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