1. January 12, 2006ILIAS-WG3 Frascati1 Virgo+ & Advanced Virgo B. Mours With material from G. Losurdo, M. Punturo, A. Viceré and others

2. January 12, 2006ILIAS-WG3 Frascati2 Virgo+ Virgo+ concept:  Medium scale improvements compatibles with the main Virgo subsystems »“Plug and play” »Same optical layout »Could be incremental  Limited shutdown  Limited commissioning time Four packages have been identified: 1.Monolithic payloads with fused silica suspensions 2.“New” laser with limited power increase (20W → 50W) 3.Mirror thermal compensation 4.Electronics and control system upgrades Installation target: beginning of 2008

3. January 12, 2006ILIAS-WG3 Frascati3 Virgo+ Sensitivity (b) f bulk = 10 -9 [Penn et al. 2005] (a) f bulk = 10 -7 [Virgo design model] Depending on thermal noise model Newtonian noise

4. January 12, 2006ILIAS-WG3 Frascati4 New loss angle evaluation LIGO Virgo Region of interest for thermal noise in adv Virgo/LIGO

5. January 12, 2006ILIAS-WG3 Frascati5 Virgo+ Astrophysical impact VirgoVirgo (50W)Virgo+ (a)Virgo+ (b) NSNS 12 (31)15 (37) 46 (114) 22 (56) BHBH 58 (145)69 (172) 234 (584) 116 (291) Inspiral Range (Mpc): averaged (optimal orientation )

6. January 12, 2006ILIAS-WG3 Frascati6 Virgo+ planning Need to reach the Virgo design sensitivity first 2007: We expect to spend more than 50% of time taking data Shutdown for Virgo+ installation  Start: from fall 2007 to the beginning of 2008.  End (back to vacuum) : about 6 months later.  This installation time could be reduced if new clean rooms are installed. The installation will be followed by recommissioning  Back to science mode operation around the end of 2008. WP package planning remarks (From November EGO council mtg):  Laser: »Need to order some components ASAP (Fiber laser and laser amplifier)  Monolithic suspension: »R&D already going on but the engineering part is probably the longest activity for Virgo+. »The mirror production is a long operation: Need to order the “blanks” ASAP  Electronic upgrade »R&D already going on.  Thermal compensation system »Not on the critical path.

7. January 12, 2006ILIAS-WG3 Frascati7 Virgo+ Budget Remarks:  For laser and monolithic suspension: summary of WP numbers (recent numbers)  For the electronic and thermal compensation: rough estimate.  Some items are part of the regular EGO budget as Virgo maintenance cost.  The cost of the needed infrastructure (new clean rooms) is not included  The 2007 budget may need some adjustments when details will be known.  Seems to fit in the EGO Budget if Virgo+ is a priority NOVEMBER 2005 Estimate

8. January 12, 2006ILIAS-WG3 Frascati8 Advanced Virgo

9. January 12, 2006ILIAS-WG3 Frascati9 Advanced Virgo Target sensitivity improvement:  One order of magnitude compared to initial Virgo Time scale: Shutdown around 2011  To be compatible with Advanced LIGO Bigger changes compared to Virgo+:  New beam topology: »Flat beam? Change the beam waist? Signal recycling??  Progress on internal thermal noise: »Material? Coating? Monolithic suspension?  Newtonian noise subtraction?  … But Smaller Changes than Advanced LIGO  keep the seismic isolation.

10. January 12, 2006ILIAS-WG3 Frascati10 Advanced Virgo Sensitivity? Not yet defined!  Task of the working group Target: Virgo/10 Some possibilities:

11. January 12, 2006ILIAS-WG3 Frascati11 Advanced Virgo Organisation 4 Working groups set up (coordinators appointed)  Low thermal noise suspensions and optics (M.Punturo, G.Losurdo)  High power laser and input optics (N.Man, P.La Penna)  Optical configuration (A.Freise, P.Hello) » (Including thermal compensation, flat beams, locking issues and signal recycling)  Electronics and controls. (A.Masserot, A.Gennai) Goal of the working groups:  Define the base line for Advanced Virgo »To be included in the Advanced Virgo white paper?  Define the work packages  Estimate the cost and planning »The budget request to be issued end of 2007 (?) GEO-Virgo MOU:  To be signed soon?