3-Mode Detection for Widening the Bandwidth of Resonant Gravitational Wave Detectors

Baggio, Lucio; Bignotto, M.; Bonaldi, M.; Cerdonio, M.; Conti, L.; Falferi, P.; Liguori, N.; Marin, A.; Mezzena, R.; Ortolan, A.; Poggi, S.; Prodi, G. A.; Salemi, F.; Soranzo, G.; Taffarello, L.; Vedovato, G.; Vinante, Andrea; Vitale, S.; Zendri, J. P.

doi:10.1103/physrevlett.94.241101

Cited by 59 publications

(71 citation statements)

References 18 publications

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“…Resonant transducers are used on resonant detectors, either bars or spheres [1,3,25], in order to improve their sensitivity and bandwidth. We consider here the same type of transducers as displacement sensors.…”

Section: B Sphere With N Resonant Transducersmentioning

confidence: 99%

“…The spherical GW antenna Minigrail and the AURIGA detector are currently operating at 5 K with SQUID amplifier energy resolution of the order of 600 [1,21]. More than a factor of 10 improvement is expected when this detector will operate at T < 100mK.…”

Section: A Parameters Optimizationmentioning

confidence: 99%

“…Resonant bar antennas are in continuous operation at 4.2K with sensitivity and bandwidth never reached before [1], [2]. These detectors could improve their sensitivity of one order of magnitude in the coming years when operating at 100mK.…”

Section: Introductionmentioning

confidence: 99%

“…Two-stage SQUID amplifiers operates at 4-5K on the bar antenna AURIGA [1], and on the spherical antenna MiniGRAIL [21], with an unprecedently reached sensitivity of about 600 .…”

Section: Introductionmentioning

confidence: 99%

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Complete model of a spherical gravitational wave detector with capacitive transducers: Calibration and sensitivity optimization

Gottardi

2007

Phys. Rev. D

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We report the results of a detailed numerical analysis of a real resonant spherical gravitational wave antenna operating with six resonant two-mode capacitive transducers read out by superconducting quantum interference devices (SQUID) amplifiers. We derive a set of equations to describe the electro-mechanical dynamics of the detector. The model takes into account the effect of all the noise sources present in each transducer chain: the thermal noise associated with the mechanical resonators, the thermal noise from the superconducting impedance matching transformer, the back-action noise and the additive current noise of the SQUID amplifier. Asymmetries in the detector signal-to-noise ratio and bandwidth, coming from considering the transducers not as point-like objects but as sensor with physically defined geometry and dimension, are also investigated. We calculate the sensitivity for an ultracryogenic, 30 ton, 2 meter in diameter, spherical detector with optimal and non-optimal impedance matching of the electrical read-out scheme to the mechanical modes. The results of the analysis is useful not only to optimize existing smaller mass spherical detector like MiniGrail, in Leiden, but also as a technological guideline for future massive detectors. Furthermore we calculate the antenna patterns when the sphere operates with one, three and six transducers. The sky coverage for two detectors based in The Netherlands and Brasil and operating in coincidence is also estimated. Finally, we describe and numerically verify a calibration and filtering procedure useful for diagnostic and detection purposes in analogy with existing resonant bar detectors.

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Section: B Sphere With N Resonant Transducersmentioning

confidence: 99%

Section: A Parameters Optimizationmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

“…Two-stage SQUID amplifiers operates at 4-5K on the bar antenna AURIGA [1], and on the spherical antenna MiniGRAIL [21], with an unprecedently reached sensitivity of about 600 .…”

Section: Introductionmentioning

confidence: 99%

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Complete model of a spherical gravitational wave detector with capacitive transducers: Calibration and sensitivity optimization

Gottardi

2007

Phys. Rev. D

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“…AURIGA is a resonant mass gravitational wave detector 1 with an usable bandwidth going from 850 Hz to 960 Hz (Baggio et al 2005). We have inspected the ATNF pulsar catalogue 2 (Manchester et al 2005) searching for sources whose gravitational radiation emission could occur at a frequency ω gw in the range above.…”

Section: The Selection Of the Samplementioning

confidence: 99%

A search for periodic gravitational waves from three recycled pulsars using the AURIGA detector

Mion

Benacquista

Krämer

et al. 2009

A&A

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Aims. We report on a search for continuous gravitational wave emission from three recycled radio pulsars, performed by using the data of the resonant detector AURIGA. Given the spin rate of the selected targets -the isolated pulsar PSR J1939+2134 and the binary pulsars PSR J0024-7204J and PSR J0218+4232 -the expected frequency of the emitted gravitational waves falls in the high sensitivity range of the detector. Methods. The main topic is the method, meaning that the statistical analysis is performed by implementing a slightly modified version of the Feldman and Cousins Unified Approach. Results. By using ephemerides provided by suitable radio observations of the targets, we were able to demodulate the Doppler shifts within a coherence time of 1 day, and then incoherently sum 10 daily spectra collected from December 8th to December 17th, 2006. We have found upper limits on the gravitational wave amplitudes in the order of a few units of 10 −23 at 90% Confidence Level (C.L.), which translate to limits in the ellipticity of the targeted pulsars of ε < 10 −4 at 90% C.L. Conclusions. The same framework can then be applied to data coming from most sensitive experiments as VIRGO or LIGO; moreover, an application to recently discovered transients in X-ray pulsars is discussed.

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The Search for Gravitational Waves: Opening a New Window into the Universe

Sintes

2010

Astrophysics and Space Science Proceedings

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3-Mode Detection for Widening the Bandwidth of Resonant Gravitational Wave Detectors

Cited by 59 publications

References 18 publications

Complete model of a spherical gravitational wave detector with capacitive transducers: Calibration and sensitivity optimization

Complete model of a spherical gravitational wave detector with capacitive transducers: Calibration and sensitivity optimization

A search for periodic gravitational waves from three recycled pulsars using the AURIGA detector

The Search for Gravitational Waves: Opening a New Window into the Universe

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