We present the performances and the strain sensitivity of the first spherical gravitational wave detector equipped with a capacitive transducer and readout by a low noise two-stage SQUID amplifier and operated at a temperature of 5 K. We characterized the detector performance in terms of thermal and electrical noise in the system output signal. We measured a peak strain sensitivity of 1.5x10(-20) Hz(-1/2) at 2942.9 Hz. A strain sensitivity of better than 5x10(-20) Hz(-1/2) has been obtained over a bandwidth of 30 Hz. We expect an improvement of more than 1 order of magnitude when the detector will operate at 50 mK. Our results represent the first step towards the development of an ultracryogenic omnidirectional detector sensitive to gravitational radiation in the 3 kHz range.
Gottardi, L., De Waard, A., Usenko, O., Frossati, G., Podt, M., Flokstra, J., et al. (2007). Sensitivity of the spherical gravitational wave detector MiniGRAIL operating at 5 K. PHYSICAL REVIEW D, PARTICLES, FIELDS, GRAVITATION, AND COSMOLOGY, 76(10), 10200501-10200510 [10.1103/PhysRevD.76.102005].
Sensitivity of the spherical gravitational wave detector MiniGRAIL operating at 5 K
BASSAN, MASSIMO;FAFONE, VIVIANA;
2007-01-01
Abstract
We present the performances and the strain sensitivity of the first spherical gravitational wave detector equipped with a capacitive transducer and readout by a low noise two-stage SQUID amplifier and operated at a temperature of 5 K. We characterized the detector performance in terms of thermal and electrical noise in the system output signal. We measured a peak strain sensitivity of 1.5x10(-20) Hz(-1/2) at 2942.9 Hz. A strain sensitivity of better than 5x10(-20) Hz(-1/2) has been obtained over a bandwidth of 30 Hz. We expect an improvement of more than 1 order of magnitude when the detector will operate at 50 mK. Our results represent the first step towards the development of an ultracryogenic omnidirectional detector sensitive to gravitational radiation in the 3 kHz range.Questo articolo è pubblicato sotto una Licenza Licenza Creative Commons
