Abstract
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 1024 is found, higher enough to note compromise the performance of Schenberg detector.
Highlights
SCHENBERG is a spherical resonant-mass Gravitational Wave (GW) detector [1, 2] built in Sao Paulo, Brazil, can be seen on figure 1
Frequency response from a 10−2 m2/Hz signal on the mixing chamber disk In order to estimate the attenuation of the proposed connection a finite element modeling was performed using SolidWorks Simulation 2010-2011 version, with a dumping ratio of 0.0005
We considered the vibration noise on the sphere surface as 10−46 m2/Hz due to thermal noise and the vibration noise in the region close to the dilution refrigerator was estimated as 10−22 m2/Hz
Summary
- Physics of Cancer: Cell–cell and cell–matrix adhesion strength, local cell stiffness and forces C T Mierke.
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