Ultrahigh Q pendulum suspensions for gravitational wave detectors

Details Ultrahigh Q pendulum suspensions for gravitational wave detectors Ultrahigh Q pendulum suspensions for gravitational wave detectors

Jul 1993

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993rsci...64.1899b&link_type=abstract

Review of Scientific Instruments (ISSN 0034-6748), vol. 64, no. 7, p. 1899-1904.

Computer Science

22

Gravitational Wave Antennas, Laser Interferometry, Pendulums, Q Factors, Suspending (Hanging), Brownian Movements, Noise Reduction, Resolution, Vibration Isolators, Viscous Damping

Scientific paper

Pendulum suspensions for laser interferometer gravitational wave detectors need to have an extremely high Q factor to minimize Brownian motion noise. In this paper we analyze the limits to the Q factor of the compound pendulum. We show that the observed acoustic loss of niobium can allow pendulum Q factors of 10 exp 10 to be achieved. This should enable a 3 km terrestrial laser interferometer detector to achieve strain sensitivity of 10 exp -22/sq rt Hz at frequencies as low as 10 Hz. At cryogenic temperatures, Q factors up to 10 exp 12 should be achievable.

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