Parametric Transducers for the Advanced Cryogenic Resonant-Mass Gravitational Wave Detectors |
| |
Authors: | Michael E. Tobar Eugene N. Ivanov David G. Blair |
| |
Affiliation: | (1) The Department of Physics, University of Western Australia, Nedlands, 6907, WA, Australia |
| |
Abstract: | It is shown that a large improvement in liquid helium and ultra-cryogenically cooled resonant-mass gravitational wave detectors can be achieved through improved parametric transducers using either low loss sapphire dielectric resonators or niobium re-entrant cavities. Performance is analysed in relation to the existing resonant bar antenna Niobe and to massive spherical detectors. Applied to Niobe, a millisecond burst sensitivity of order 10–20 can be achieved, corresponding to a spectral strain sensitivity of 2 × 10-22Hz with a 50 Hz bandwidth. Applied to an ultra-cryogenic 117 tonne spherical detector made from CuAl, a spectral strain sensitivity of better than 2 ×10-23/Hz with a bandwidth of order 100 Hz can be achieved, which is close to the quantum limit. This sensitivity is comparable to that of advanced interferometer detectors at this frequency. |
| |
Keywords: | Gravitational waves sapphire parametric transducer |
本文献已被 SpringerLink 等数据库收录! |
|