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Towards Advanced Virgo

Towards Advanced Virgo. Giovanni Losurdo – INFN Firenze Advanced Virgo Coordinator on behalf of the Virgo Collaboration. Time scale for the upgrades. Advanced LIGO commissioning expected to end: 2013 [LIGO pres. at PAC G050255-01-R].

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Towards Advanced Virgo

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  1. Towards Advanced Virgo Giovanni Losurdo – INFN Firenze Advanced Virgo Coordinator on behalf of the Virgo Collaboration

  2. Time scale for the upgrades • Advanced LIGO commissioning expected to end: 2013[LIGO pres. at PAC G050255-01-R]. • We need an advanced detector on the same timescale to remain in the network: Advanced Virgo • Virgo already has an “advanced” isolation system: we have the opportunity to improve significantly the sensitivity on a shorter timescale: Virgo+ ILIAS Annual Meeting – London, Oct 27th, 2006G.Losurdo – INFN Firenze-Urbino2

  3. Advanced Virgo White Paper • Sensitivity curve (models for fundamental noises, technical noises) • Astrophysical figures of merit • Possible improvements of the detector • Short term upgrades: Virgo+ • Advanced Virgo ILIAS Annual Meeting – London, Oct 27th, 2006G.Losurdo – INFN Firenze-Urbino3

  4. Virgo+ • Virgo could be upgraded with a set of medium scale, incremental improvements with: • Compatibility with the main Virgo subsystems (“plug and play”), same optical layout • Limited shutdown • Limited commissioning time • Four packages have been proposed and funded: • New laser, with limited power increase (2050 W) • Mirror thermal compensation • Electronics and control system upgrades • Monolithic payloads with fused silica suspensions • Installation foreseen in 2008 ILIAS Annual Meeting – London, Oct 27th, 2006G.Losurdo – INFN Firenze-Urbino4

  5. (b) (a) (c) Virgo+ sensitivity ILIAS Annual Meeting – London, Oct 27th, 2006G.Losurdo – INFN Firenze-Urbino5

  6. Steps towards Advanced Virgo Four working groups have been set up at the end of 2005 to carry on the studies for Advanced Virgo: • WG1:interferometer optical configuration, sensing and control (chairs: A.Freise, P.Hello) • WG2:laser and optics for high power (chairs: P.La Penna, N.Man) • WG3:suspensions and thermal noise issues (chairs: M.Punturo, P.Puppo) • WG4: electronics and controls (chairs: A.Gennai, N.Leroy) WG3 and WG4 are responsible also of the development of electronics and monolithic suspensions for Virgo+ ILIAS Annual Meeting – London, Oct 27th, 2006G.Losurdo – INFN Firenze-Urbino6

  7. Steps towards Advanced Virgo • An Advanced Virgo coordinator has been appointed with the mandate of: • Coordinating the WGs activities • Coordinating the writing up of an Advanced Virgo Design by November 2007 • Document contents: • Detector design (options and path towards selection) • Sensitivity curve • General planning and cost evaluation ILIAS Annual Meeting – London, Oct 27th, 2006G.Losurdo – INFN Firenze-Urbino7

  8. Guidelines for R&D GOAL: define the prioritary R&D lines for an Advanced Virgo in 2011 ILIAS Annual Meeting – London, Oct 27th, 2006G.Losurdo – INFN Firenze-Urbino8

  9. R&D: priority list • Definition of the optical configuration, locking and alignment scheme, detection scheme • High power laser • Input optics compliant with high power • Output optics and photodiodes compliant with high power and with the chosen detection scheme • Monolithic suspensions • Mirrors and coatings • Vibration isolation and suspension control Advanced Virgo (2011) is not expected to use: • Cryogenics • Squeezing • Non gaussian beams ILIAS Annual Meeting – London, Oct 27th, 2006G.Losurdo – INFN Firenze-Urbino9

  10. EGO 2nd call for R&Ds • 2nd EGO call for R&D • 20 Letter of Intents received, reviewed by STAC • LoIs to be turned into proposals by Nov 9th • Meeting for proposal presentation to the Collaboration (Nov 7th) ILIAS Annual Meeting – London, Oct 27th, 2006G.Losurdo – INFN Firenze-Urbino10

  11. Design options • Optical configuration • Change beam waist position • Use signal recycling • Use DC detection • Thermal compensation scheme • High power laser • Solid state or fibre laser • Input optics • EOM and Faraday compliant with high power • New telescopes for the new optical configuration • New input mode cleaner. Fibre mode cleaner • Output optics and photodiodes • New photodiodes for higher power • New OMC ILIAS Annual Meeting – London, Oct 27th, 2006G.Losurdo – INFN Firenze-Urbino11

  12. Design options • Monolithic suspensions (already studied for Virgo+) • Make it compliant with heavier mirrors • Use ribbons • New engineering of ears, fibers, bonding • Test masses • New mirrors geometry • New coatings • New procedures for cleanliness • Vibration isolation and suspensions control • 6 d.o.f. control of the superattenuator top stage (tackling tilt effect) • Electrostatic actuators We expect to select most of the listed options in the Advanced Virgo Design document ILIAS Annual Meeting – London, Oct 27th, 2006G.Losurdo – INFN Firenze-Urbino12

  13. A possible joint run planning Summary • The upgrade to Virgo+ has been funded, installation foreseen in 2008 • The Virgo Collaboration has started the design effort for a second generation detector in 2011 • Advanced Virgo Design due by November 2007 Advanced Virgo web page Online soon… ILIAS Annual Meeting – London, Oct 27th, 2006G.Losurdo – INFN Firenze-Urbino13

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