The Brazilian gravitational wave detector Mario Schenberg: progress and plans

Aguiar, O. D.; Andrade, L A; Barroso, Joaquim J.; Bortoli, F. S.; Carneiro, L A; Castro, P.J.; Costa, C. A.; Costa, Karen; Araújo, J. C. N. de; Lucena, Angel; Paula, W. de; Neto, E C de Rey; Souza, S T de; Fauth, A. C.; Frajuca, Carlos; Frossati, G.; Furtado, S R; Magalhães, Nadja S.; Marinho, R. M.; Matos, E S; Melo, J. L.; Miranda, Oswaldo D.; Oliveira, N. F.; Paleo, Bruno Woltzenlogel; Rémy, M.; Ribeiro, K L; Stellati, C; Velloso, W. F.; Weber, J.

doi:10.1088/0264-9381/22/10/011

Cited by 36 publications

(12 citation statements)

References 13 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…A spherical prototype called MiniGRAIL [234] has been operated in the Netherlands [181]. A similar prototype called the Schenberg detector [203] is being built in Brazil [21]. Nested cylinders or spheres, or masses designed to sense multiple modes of vibration may also provide a clever way to improve on bar sensitivities [86].…”

Section: Sensor Noisementioning

confidence: 99%

Physics, Astrophysics and Cosmology with Gravitational Waves

Sathyaprakash

Schutz

2009

Living Rev. Relativ.

912

972

View full text Add to dashboard Cite

Gravitational wave detectors are already operating at interesting sensitivity levels, and they have an upgrade path that should result in secure detections by 2014. We review the physics of gravitational waves, how they interact with detectors (bars and interferometers), and how these detectors operate. We study the most likely sources of gravitational waves and review the data analysis methods that are used to extract their signals from detector noise. Then we consider the consequences of gravitational wave detections and observations for physics, astrophysics, and cosmology.

show abstract

Section: Sensor Noisementioning

confidence: 99%

Physics, Astrophysics and Cosmology with Gravitational Waves

Sathyaprakash

Schutz

2009

Living Rev. Relativ.

912

972

View full text Add to dashboard Cite

show abstract

“…In more recent generations of resonant-mass detectors, instead of being composed of a bar, they carried a spherical mass shape. Designed in that profile, the Schenberg's main element has about 1150 kg and 65 cm in diameter, is made of copper-aluminum alloy with 94 % Cu and 6 % Al [1] and is sensitive to signals from 3150 Hz to 3260 Hz. The sphere is held in a cryogenic chamber hung by a suspension mechanism and nine transducers were responsible for converting the mechanical vibration into an electrical signal that, later on, would be read for data analysis and searched for gravitational-wave signals.…”

Section: Introductionmentioning

confidence: 99%

Search for gravitational-wave bursts in LIGO data at the Schenberg antenna sensitivity range

Martins¹,

Heng²,

Melo³

et al. 2023

Preprint

View full text Add to dashboard Cite

The Brazilian gravitational-wave detector Mario Schenberg was conceived in the early 2000s and operated until 2016 when it was dismantled. A straight path to evaluate the viability of the reassembly of the Schenberg antenna is to verify the possibility of detecting gravitational wave (GW) signals within its design sensitivity features. The eventual identification of significant signals would operate as motivation for the Schenberg rebuild. As the antenna was dismantled, we can get some indication from the third observing run (O3) data of the LIGO detectors. It is based on the similarity between Schenberg ultimate sensitivity and the sensitivity of the interferometers in the O3 [3150-3260] Hz band. We search for signals with milliseconds to a few seconds without making assumptions about their morphology, polarization, and arrival sky direction. The data were analyzed with the coherent WaveBurst pipeline (cWB) with frequencies from 512 Hz to 4096 Hz and the search targets only signals with bandwidth overlapping the Schenberg frequency band. No statistically significant evidence of GW bursts during O3 was found. The null result was used to feature the search efficiency in identifying different simulated signal morphologies and establish upper limits on the GW burst event rate as a function of its strain amplitude. The present search, and consequently Schenberg, is sensitive to sources emitting isotropically 5×10 −6 M c 2 in GWs from a distance of 10 kpc with 50% detection efficiency and with a false alarm rate of 1/100 years. The feasibility of detecting f-modes of neutron stars excited by glitches was also investigated. The Schenberg antenna would need at least 5.3 years of observation run to get a single detection of the f-mode signal, given E glitch ≈ 10 −10 M c 2 .

show abstract

“…2. Such motion excites the membrane of the resonant cavity where the microwaves are pumped into, generating side band signals that will carry information on the GW [19,20]. The microwaves reach the resonant cavities through cables that start outside the dewar and end at microstrip antennas [21,22].…”

Section: Introductionmentioning

confidence: 99%

On the Dilution Refrigerator Thermal Connection for the SCHENBERG Gravitational Wave Detector

et al. 2020

View full text Add to dashboard Cite

The resonant-mass gravitational wave detector SCHENBERG was designed by the Brazilian group Graviton to be sensitive to a central frequency nearing 3200 Hz and a bandwidth of 200 Hz. It has a spherical antenna weighing 1150 kg that is connected to the outer environment by a suspension system designed to attenuate local noise due to seism as well as other sources. Should a gravitational wave pass by the detector, the antenna is expected to vibrate. This motion will be monitored by six parametric transducers whose output signals will be digitally analyzed. In order to improve the sensitivity of the detector, it must be cooled down to the lowest possible temperature, and for this purpose a dilution refrigerator is planned to be implemented in the detector. It is known that such device produces vibration when operational, consequently introducing noise in the system. Using the finite elements method, this work investigates thermal connections between the dilution refrigerator and the sphere suspension that allow the detector to operate within its projected sensitivity. The finite elements method showed an attenuation of 240dB in the best-valued thermal connection.

show abstract

The Brazilian gravitational wave detector Mario Schenberg: progress and plans

Cited by 36 publications

References 13 publications

Physics, Astrophysics and Cosmology with Gravitational Waves

Physics, Astrophysics and Cosmology with Gravitational Waves

Search for gravitational-wave bursts in LIGO data at the Schenberg antenna sensitivity range

On the Dilution Refrigerator Thermal Connection for the SCHENBERG Gravitational Wave Detector

Contact Info

Product

Resources

About