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Cryogenic Suspension Design for Advanced GW Detectors

This project aims to develop a cryogenic suspension system that minimizes seismic and thermal noise to achieve a sensitivity of 1 Hz for gravitational wave detectors. The project builds upon the legacy of the R&D ILIAS-Strega project and involves multiple groups and organizations. The activities include substrate and coating property definition, design of upper and lower suspensions, cooling system design, and thermal noise requirements. Regular meetings and quarterly face-to-face meetings will be held to ensure progress and coordination. The first internal report is expected in December 2008.

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Cryogenic Suspension Design for Advanced GW Detectors

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  1. ET- WP2 start-up Fulvio Ricci Cascina, November, 24th 2008

  2. WP2 - Mission • Pave the road to get the sensitivity of a GW detector as near as • possible to 1 Hz, by seismic and thermal noise • Passive and active seismic attenuation • Low dissipation materials for mirror suspensions • Cryogenics: safety and noise compatibility in the underground environment Its starting point: the legacy of the R&D ILIAS – Strega project

  3. The Prototype of Cryogenic Payload installed at the EGO West hall @1.5 km

  4. Tasks and involved Groups • Definition of substrates and coating properties at low temperature: Groups: LMA, Glasgow, INFN- Firenze/Urbino, INFN-Genova, INFN-Perugia, INFN-Padova/Trento……… Science team: Jena, Trieste……… • Design of Upper Suspensions: Groups: INFN-Pisa, EGO……… • Design of Lower Suspension Mechanics: Groups: INFN- Roma1,INFN-Firenze, INFN-Perugia, INFN-Pisa, Glasgow……. • Design of Cooling System: Groups: INFN- Roma1, INFN-Roma2…….. Science Team: ICRR –Japan (TBC)……… • Design of Lower Suspension Sensing and Actuation: Groups: INFN-Roma2, INFN-Napoli, INFN-Padova/Trento, INFN-Roma1…… Science Team: Genova…….. • Design of Lower Suspension Fibers: Groups: Glasgow, INFN-Firenze/Urbino, INFN-Perugia, INFN-Pisa………

  5. WP2 – Task Coordination Definition of substrates and coating properties at low  temperature ( R. Flaminio , R. Nawrodt, F. Vetrano)  Design of Upper Suspensions (TBD)  Design of Lower Suspension Mechanics (P. Puppo, F. Travasso)  Design of Cooling System and impact on vacuum (F. Ricci, E. Coccia) Design of Lower Suspension Sensing and Actuation (V. Fafone, R. De Rosa, P. Falferi, E. Majorana) Design of Lower Suspension Fibers (S. Rowan, M. Tonelli)

  6. Thermal Noise Requirements for the Suspensions of the 3rd Gen ITF - Task ID 18 Material Intrinsic losses requirements at low temperatures Seismic Attenuation Requirements of the suspension (100 days – M15) Suspension seismic attenuation requirements (input from site selection) Identification of control strategy and optimal mode frequencies for suspension elements Preliminary Conceptual Design of the overall Cryogenic Suspension (360 days – M24) Upper Suspension preliminary Design: Active vs. Passive Super Attenuator (4 Months) Conceptual design of damping, alignment and control strategy (12 Months) Cryogenic compatibility of Upper Suspension Design (12 Months) Last Stage Suspension Preliminary Design (300 days - M24) Test Mass Requirements (3 Months – M13) Test Mass Definition (4 Months – M23) Suspension Wires material and size choice (Input from Material Selection) Definition of last stage actuation strategy and technology Cooling Requirements and Cooling Strategy definition (360 days - M26) Thermal Path definition and Thermal Links Requirements (6 Months - M21) Thermal Links Conceptual design (6 Months – M26) Finalization of the Conceptual Design of the Overall Cryogenic Suspension Month 1-33 Month 1-12 Month 1-15 Month 10-26 Month 12-26 Month 10-26 Month 10-24 Month 26-33

  7. Activity organization of the WP2: • Monthly phone/video meetings • Quarterly Face-to-Face Meetings of the WG2 group • Brief report with activity highlights sent to the entire ET list following each quarterly meeting • Meetings open to the entire ET community Milestone-December 2008 : First ET internal report

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