A system must not be necessarily as small as a pollen particle to be dominated by microscopic fluctuations: also a ton-size resonant metal bar can be used as a test bench for statistical mechanics theories. We analyze the thermodynamic balance of the gravitational wave detector AURIGA, modeled as a macroscopic electromechanical oscillator in contact with a thermal bath T_0=4.6 K and further cooled by an active feedback system, equivalent to a viscous force. The oscillator is driven to a non-equilibrium steady state, at the fictitious 'effective temperature' T_eff=21 mK<
Thermodynamic fluctuations in actively cooled resonators
M Bonaldi;
2011
Abstract
A system must not be necessarily as small as a pollen particle to be dominated by microscopic fluctuations: also a ton-size resonant metal bar can be used as a test bench for statistical mechanics theories. We analyze the thermodynamic balance of the gravitational wave detector AURIGA, modeled as a macroscopic electromechanical oscillator in contact with a thermal bath T_0=4.6 K and further cooled by an active feedback system, equivalent to a viscous force. The oscillator is driven to a non-equilibrium steady state, at the fictitious 'effective temperature' T_eff=21 mK<File in questo prodotto:
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