an optomechanical transducer for the AURIGA “bar” gw detector - PowerPoint PPT Presentation

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an optomechanical transducer for the AURIGA “bar” gw detector

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  1. an optomechanical transducer for the AURIGA “bar” gw detector cryogenic optics towards the quantum limit: high finesse cavities, fibers, piezo actuators, etc @ 4.2 K concept and optics: Livia Conti, Maurizio DeRosa, Francesco Marin cryogenics: Michele Bonaldi, Giovanni A. Prodi, Luca Taffarello, Jean-Pierre Zendri

  2. bar The Concept Optical Transducer Variations of the transducer cavity length are measured by the stabilized laser Transducer cavity: a Fabry-Perot cavity between the bar and the resonant plate Reference cavity: a stable Fabry-Perot cavity acting as length reference Laser source frequency locked to the reference cavity

  3. Optical Transducer Status: Room temperature test Experimental set-up Achieved gw sensitivity L.Conti et al,. Jour. Appl. Phys. 93 (2003) 3589

  4. Optical Transducer Status: Cryogenics Q measurements in the Transducer Test Facility New Cryostat for the bar resonator under construction

  5. will operate at 4.2 K ~ 1 year • a prototype gw detector in coincidence with AURIGA • study at low T the coating thermal noise and the substrate • thermoelastic noises (“thermodynamic” and “photothermal”) • at the displacement level ~ 10-20 m/Hz1/2