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JRA3 STREGA - Introduction

JRA3 STREGA - Introduction. Geppo Cagnoli IGR – University of Glasgow ILIAS-GW Meeting, Orsay, 5 th -6 th Nov 2004. 10 9. 10 3. 10 6 [Hz]. 10 0. Interferometers. RF Cavities. Bars and Spheres. Overview on GW detection.

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JRA3 STREGA - Introduction

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  1. JRA3 STREGA - Introduction Geppo Cagnoli IGR – University of Glasgow ILIAS-GW Meeting, Orsay, 5th-6th Nov 2004

  2. 10 9 10 3 10 6 [Hz] 10 0 Interferometers RF Cavities Bars and Spheres Overview on GW detection • The expected strain of space is 10-22 Hz-1/2 or lower ILIAS-GW Meeting, Orsay, 5th – 6th Nov 2004

  3. Ultimate limits on GW detection All the detectors are mainly limited by thermal noise that causes fluctuations on position and shape of the test masses • Interferometers: thermal noise in mirrors and in suspension fibres • Bars/Spheres: thermal noise in the resonant elements • RF cavities: thermal noise in the cavity walls and in the e.m. field ILIAS-GW Meeting, Orsay, 5th – 6th Nov 2004

  4. STREGA Mission • Lower thermal noise 10 times • with respect to the • second generation detectors ILIAS-GW Meeting, Orsay, 5th – 6th Nov 2004

  5. 1ST GENERATION SHOULD REACH THE VIRGO CLUSTER AT 17MPc LIGO VIRGO 10 -19 • 1ST GENERATION • FOR IFOS • STEEL SUSPENSIONS (APART GEO600) • ROOM TEMPERATURE • FOR RESONATORS • ALUMINIUM CYLINDERS • 100mK < T < 4K AURIGA NAUTILUS 10 -20 GEO600 10 -21 10 -22 10 -23 10 -24 10 -25 LIGO SCIENTIFIC RUN 3 POSSIBLE DETECTION OF NS/NS MERGING WITHIN THE LOCAL GROUP DISTANCE < 1.8 MPc 10 100 1k 10k 1 Frequency [Hz] IFOS TH.NS BAND Detectors Generations h [ Hz –1/2 ] ILIAS-GW Meeting, Orsay, 5th – 6th Nov 2004

  6. LIGO VIRGO 10 -19 • 2ND GENERATION • FOR IFOS • SILICA SUSPENSIONS • HIGHER LASER POWER • ROOM TEMPERATURE • FOR RESONATORS • CuAl SPHERES • T < 100mK • BETTER READOUT • RF CAVITIES • 1ST DETECTORS AURIGA NAUTILUS 10 -20 PACO GEO600 10 -21 10 -22 MiniGRAIL AD. LIGO AD. VIRGO 10 -23 10 -24 10 -25 10 100 1k 10k 1 Frequency [Hz] Detectors Generations • 1ST GENERATION • FOR IFOS • STEEL SUSPENSIONS (APART GEO600) • ROOM TEMPERATURE • FOR RESONATORS • ALUMINIUM CYLINDERS • 100mK < T < 4K h [ Hz –1/2 ] ILIAS-GW Meeting, Orsay, 5th – 6th Nov 2004

  7. LIGO VIRGO 10 -19 • 3RD GENERATION • FOR IFOS • SILICON MIRRORS • SILICON SUSPENSIONS • HIGHER LASER POWER • BETTER COATINGS • LOW TEMPERATURE • FOR RESONATORS • CRISTALLINE MATERIALS • DOUBLE RESONATORS • T < 10mK • SQL • 2ND GENERATION • FOR IFOS • SILICA SUSPENSIONS • HIGHER LASER POWER • ROOM TEMPERATURE • FOR RESONATORS • CuAl SPHERES • T < 100mK • BETTER READOUT • RF CAVITIES • 1ST DETECTORS AURIGA NAUTILUS 10 -20 PACO GEO600 10 -21 10 -22 EGO MiniGRAIL AD. LIGO AD. VIRGO 10 -23 10 -24 DUAL Z = 1 10 -25 10 100 1k 10k 1 Frequency [Hz] Detectors Generations • 1ST GENERATION • FOR IFOS • STEEL SUSPENSIONS (APART GEO600) • ROOM TEMPERATURE • FOR RESONATORS • ALUMINIUM CYLINDERS • 100mK < T < 4K h [ Hz –1/2 ] ILIAS-GW Meeting, Orsay, 5th – 6th Nov 2004

  8. … coming back on Earth3 Objectives for STREGA • 1 Research on Materials Outcomes • - Selection or Development of the most suitable materials forMirrors, Suspensions and Resonant Masses • - Development of low losses Dielectric Coatings • - Investigation on Acoustic Emission caused by Cosmic Rays ILIAS-GW Meeting, Orsay, 5th – 6th Nov 2004

  9. … coming back on Earth3 Objectives for STREGA 2 Research on Cryogenics Outcomes - Development of a cryogenic system for the interferometers with a low mechanical noise - Design of a last stage suspension able to provide 1W of heat flow at ~5K - Development of a low noise ultra cryogenic system (~10mK) for resonant detectors ILIAS-GW Meeting, Orsay, 5th – 6th Nov 2004

  10. … coming back on Earth3 Objectives for STREGA 3 Research on Thermal Noise Outcomes - Development of facilities for the direct measurement of Thermo-elastic noise - Development of facilities for the direct measurement of Photo-elastic noise - Novel read-out configurations able to reduce the effect of thermal noise on the signal detected with resonant bars ILIAS-GW Meeting, Orsay, 5th – 6th Nov 2004

  11. Some Numbers 124 people of 25 different groups (subgroup of the Network) € 1794 per person per year STREGA web page: http://www.ego-gw.it/ILIAS-GW/ STREGA has the largest number of deliverables among the ILIAS activities (15 in the first 18 months) GOOD WORK !! ILIAS-GW Meeting, Orsay, 5th – 6th Nov 2004

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