On the Cabling Seismic Isolation for the Microwave Transducers of the Schenberg Detector

Bortoli, Fábio da Silva; Frajuca, Carlos; Magalhães, Nadja S.; Aguiar, O. D.; Souza, S T de

doi:10.1007/s13538-018-0615-3

Cited by 28 publications

(9 citation statements)

References 22 publications

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“…The authors forms a interdisciplinary group, what makes these studies possible, to check it go to references [18][19][20][21][22][23][24][25][26][27][28][29][30][31][32][33][34][35].…”

Section: Acknowledgementsmentioning

confidence: 99%

Study of Geometries and Stability for Energy Density in Electromechanical Battery Flywheels with a Gaussian Shape

Coppede,

Silva Bortoli,

Goncalves de Moura

et al. 2024

J. Phys.: Conf. Ser.

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A study on flywheels materials and geometries is presented here with the use of finite element modeling (FEM) simulations. The study analyzes the stress behavior of flywheel rotors subject to the rotational speed that creates the maximum stress that the flywheel can support, and then calculates the rotational energy mass ratio for each geometry. The obtained geometry was Gaussian section for the Flywheel rotor. The material used in this case study is carbon fiber Hexcel UHM 12000. The best results were a rotational speed of ≈ 279.000 rpm and rotational energy density of ≈ 440 Wh/kg. Then, to increase the total energy, Flywheel with 2 and 3 rotors were analyzed. Then the stability under rotation of these Flywheels were analyzed, some instability was found and a solution was presented.

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“…The authors forms a interdisciplinary group, what makes these studies possible, to check it go to references [18][19][20][21][22][23][24][25][26][27][28][29][30][31][32][33][34][35].…”

Section: Acknowledgementsmentioning

confidence: 99%

Study of Geometries and Stability for Energy Density in Electromechanical Battery Flywheels with a Gaussian Shape

Coppede,

Silva Bortoli,

Goncalves de Moura

et al. 2024

J. Phys.: Conf. Ser.

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Section: Introductionmentioning

confidence: 99%

“…When the detector is in operation, the motion of the antenna's surface is monitored by six parametric microwave transducers with their distribution on the shape of half a dodecahedron circumscribed to the antenna sphere (Frajuca et al 2008). More details on the SCHENBERG detector and on spherical resonant-mass GW detectors can be found in Aguiar et al 2002;Bortoli et al 2016;Bortoli et al 2019;Bortoli et al 2020;Bortoli et al 2010;Costa et al 2004;Frajuca et al 2018;Magalhaes et al 1995. When a GW passes through a resonant-mass detector, its antenna vibrates, whose surface motion is measured by transducers that generate electrical signals as outputs (Frajuca et al 2006). These signals are then analyzed and the intensity of such GW can be obtained; in the case of a spherical antenna, even the source's direction can be determined with only one detector (Magalhaes et al 1997).…”

Section: Introductionmentioning

confidence: 99%

Coherent quantum states in resonant‐mass gravitational wave detectors

et al. 2023

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“…The instrument will be maintained at low temperatures (∼ 4 K) by cryogenic chambers (dewars), cooled down by a He flow [9]. The antenna is coupled to parametric transducers that will monitor the vibrations of the quadrupolar/monopolar normal modes of the sphere [10][11][12][13][14]. One of the main advantages of a GW spherical resonant antenna is its omnidirectional sensitivity, which makes it equally responsive to all wave directions and polarizations [15].…”

Section: Introductionmentioning

confidence: 99%

The Design Strain Sensitivity of the Schenberg Spherical Resonant Antenna for Gravitational Waves

Liccardo

Lenzi

Marinho

et al. 2023

Preprint

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The main purpose of this study is to review the Schenberg resonant antenna transfer function and to recalculate the antenna design strain sensitivity for gravitational waves. We consider the spherical antenna with six transducers in the semi dodecahedral configuration. When coupled to the antenna, the transducer-sphere system will work as a mass-spring system with three masses. The first one is the antenna effective mass for each quadrupolemode, the second one is the mass of the mechanical structure of the transducer first mechanical mode and the third one is the effective mass of the transducer membrane that makes one of the transducer microwave cavity walls. All the calculations are done for the degenerate (all the sphere quadrupole mode frequencies equal) and non-degenerate sphere cases. We have come to the conclusion that the “ultimate” sensitivity of an advanced version of Schenberg antenna (aSchenberg) is around the standard quantum limit (although the parametric transducers used could, in principle, surpass this limit). However, this sensitivity, in the frequency range where Schenberg operates, has already been achieved by the two aLIGOs in the O3 run, therefore, the only reasonable justification for remounting the Schenberg antenna and trying to place it in the sensitivity of the standard quantum limit would be to detect gravitational waves with another physical principle, different from the one used by laser interferometers. This other physical principle would be the absorption of the gravitational wave energy by a resonant mass like Schenberg.

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On the Cabling Seismic Isolation for the Microwave Transducers of the Schenberg Detector

Cited by 28 publications

References 22 publications

Study of Geometries and Stability for Energy Density in Electromechanical Battery Flywheels with a Gaussian Shape

Study of Geometries and Stability for Energy Density in Electromechanical Battery Flywheels with a Gaussian Shape

Coherent quantum states in resonant‐mass gravitational wave detectors

The Design Strain Sensitivity of the Schenberg Spherical Resonant Antenna for Gravitational Waves

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