Increasing the bandwidth of resonant gravitational antennas: The case of Explorer
P. Astone, D. Babusci, M. Bassan, P. Carelli, G. Cavallari, E. Coccia, C. Cosmelli, S. D'Antonio, V. Fafone, A. C. Fauth, G. Federici, G. Giordano, A. Marini, Y. Minenkov, I. Modena, G. Modestino, A. Moleti, G. V. Pallottino, G. Pizzella, L. Quintieri, A. Rocchi, F. Ronga, R. Terenzi, G. Torrioli, M. Visco
Abstract
Resonant gravitational wave detectors with an observation bandwidth of tens of hertz are a reality: the antenna Explorer, operated at CERN by the ROG collaboration, has been upgraded with a new read-out. In this new configuration, it exhibits an unprecedented useful bandwidth: in over 55 Hz about its frequency of operation of 919 Hz the spectral sensitivity is better than 10-20 /sqrt(Hz) . We describe the detector and its sensitivity and discuss the foreseable upgrades to even larger bandwidths.
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