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

Autor(es)

Bortoli, Fabio da Silva ^[1] ; Frajuca, Carlos ^[1] ; Magalhaes, Nadja S. ^[2] ; de Souza, Sergio Turano ^[3] ; da Silva Junior, Wilson Carlos ^[1]

Afiliação do(s) autor(es)

^[1] Sao Paulo Fed Inst, Dept Mecan, Sao Paulo, SP - Brazil

^[2] Univ Fed Sao Paulo, Dept Phys, Diadema, SP - Brazil

^[3] Cruzeiro do Sul Univ, FATEC Prof Miguel Reale, Sao Paulo, SP - Brazil

• Tipo de documento: Artigo Científico
• Fonte: Brazilian Journal of Physics; v. 50, n. 5 AUG 2020.
• Citações Web of Science: 0

Resumo

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. (AU)

• Processo FAPESP: 13/26258-4 - Matéria superdensa no universo
• Beneficiário: Manuel Máximo Bastos Malheiro de Oliveira
• Modalidade de apoio: Auxílio à Pesquisa - Temático