Thermal connection and vibrational isolation: an elegant solution for two problems

11th Edoardo Amaldi Conference on Gravitational Waves

Frajuca, C.^1 ; Bortoli, F.S.^1 ; Magalhaes, N.S.^2 ; Aguiar, O.D.^3

Sao Paulo Federal Institute, Rua Pedro Vicente 625, Sao Paulo SP

01109-010, Brazil^1

Federal University of Sao Paulo, Department of Exact and Earth Sciences, Rua Sao Nicolau 120, Diadema, SP

09913-030, Brazil^2

INPE Astrophysics Division, Sao Jose dos Campos SP

12227-010, Brazil^3

关键词: Central frequency;    Dilution refrigerator;    Sphere suspension;    Strain amplitude;    Vibration attenuation;    Vibration noise;   

Others  :  https://iopscience.iop.org/article/10.1088/1742-6596/716/1/012023/pdf
DOI  :  10.1088/1742-6596/716/1/012023

来源: IOP

【 摘 要 】

Schenberg is a detector of gravitational waves resonant mass type, with a central frequency of operation of 3200 Hz. Transducers located on the surface of the resonating sphere, according to a distribution half-dodecahedron, are used to monitor a strain amplitude. To improve the performance of the detector it is essential to decrease the temperature, then it will be cooled down, this temperature could reach as low as 50 mK. This refrigerator produces vibration noise that could compromise the performance of Schenberg detector. In this work we the study such vibration noise and how it could be minimized proposing a new connection from the dilution refrigerator to the sphere suspension. The vibration attenuation is studied by finite element modeling (FEM) and an attenuation higher than 1024is found, higher enough to note compromise the performance of Schenberg detector.