Abstract
Consideration of the estimated strengths and rates of occurrence of various classes of gravitational-radiation sources points to the desirability of developing detectors with sensitivity that is sufficient for seeing predicted events at frequencies below 1 kHz. This paper discusses the sensitivity limitations of a laboratory-scale detector consisting of a microwave cavity with ends that are free to move in response to a gravitational wave. Fundamental sensitivity limits due to readout amplifier noise as well as limitations due to thermal, seismic, and oscillator noise sources are considered. Between roughly 10 and 200 Hz it appears feasible to operate a detector at the linear amplifier sensitivity limit with a dimensionless strain noise spectral density of 10/sup -21//Hz/sup 1/2/ at 100 Hz. This sensitivity is sufficient for detecting 100 M/sub c//sub i//sub r//sub d//sub o//sub t/ black-hole coalescence events to a distance of 50 Mpc with an amplitude signal-to-noise ratio greater than 10.
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