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

advanced ILIAS Annual Meeting – London, Oct 27th, 2006 G.Losurdo – INFN Firenze-Urbino 2 Time scale for the upgrades  Advanced LIGO commissioning expected to end: 2013 [LIGO pres. at PAC G 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+

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

advanced ILIAS Annual Meeting – London, Oct 27th, 2006 G.Losurdo – INFN Firenze-Urbino 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: 1.New laser, with limited power increase (20  50 W) 2.Mirror thermal compensation 3.Electronics and control system upgrades 4.Monolithic payloads with fused silica suspensions  Installation foreseen in 2008

advanced ILIAS Annual Meeting – London, Oct 27th, 2006 G.Losurdo – INFN Firenze-Urbino 5 Virgo+ sensitivity Inspiral range VirgoVirgo+ (a)Virgo+ (b)Virgo+ (c) NSNS12.5 (31)61 (153)62 (155)28 (70) BHBH58 (145)313 (784)318 (795)142 (355) (b) (a) (c)

advanced ILIAS Annual Meeting – London, Oct 27th, 2006 G.Losurdo – INFN Firenze-Urbino 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+

advanced ILIAS Annual Meeting – London, Oct 27th, 2006 G.Losurdo – INFN Firenze-Urbino 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

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

advanced ILIAS Annual Meeting – London, Oct 27th, 2006 G.Losurdo – INFN Firenze-Urbino 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

advanced ILIAS Annual Meeting – London, Oct 27th, 2006 G.Losurdo – INFN Firenze-Urbino 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)

advanced ILIAS Annual Meeting – London, Oct 27th, 2006 G.Losurdo – INFN Firenze-Urbino 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

advanced ILIAS Annual Meeting – London, Oct 27th, 2006 G.Losurdo – INFN Firenze-Urbino 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

advanced ILIAS Annual Meeting – London, Oct 27th, 2006 G.Losurdo – INFN Firenze-Urbino 13 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… A possible joint run planning