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Allegro: noise performance and the ongoing search for gravitational waves

I S Heng1, E Daw1, J Giaime1, W O Hamilton1, M P Mchugh2 and W W Johnson1

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The noise performance of Allegro since 1993 is summarized. We show that the noise level of Allegro is, in general, stationary. Non-Gaussian impulse excitations persist despite efforts to isolate the detector from environmental disturbances. Some excitations are caused by seismic activity and flux jumps in the SQUID. Algorithms to identify and automatically veto these events are presented. Also, the contribution of Allegro to collaborations with other resonant-mass detectors via the International Gravitational Event Collaboration and with LIGO is reviewed.


PACS

04.80.Nn Gravitational wave detectors and experiments

95.85.Sz Gravitational radiation, magnetic fields, and other observations

05.40.Ca Noise

MSC

83C35 Gravitational waves

Subjects

Gravitation and cosmology

Statistical physics and nonlinear systems

Astrophysics and astroparticles

Dates

Issue 7 (7 April 2002)

Received 14 October 2001, in final form 14 November 2001

Published 18 March 2002



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