1. Francesco Fidecaro Advanced Virgo Review, Cascina, November 3, 2008 Virgo brief status report

2. 2 Contents Virgo and EGO Virgo/Virgo+ as a step toward Advanced Virgo Analysis capability Collaboration life

3. 3 The Virgo collaboration Initial efforts –Brillet (optics) –Giazotto (seismic isolation) French-Italian Collaboration established 1992 Now –LAPP Annecy –EGO Cascina –Firenze-Urbino –Genova –Napoli –OCA Nice –NIKHEF Amsterdam –LAL Orsay –LMA Lyon – ESPCI Paris –APC Paris –Perugia –Pisa –Roma La Sapienza –Roma Tor Vergata –Trento-Padova –Warsaw –In negotiation: RMKI Budapest About 160 authors

4. 4 The European Gravitational Observatory PURPOSE The Consortium shall have as its purpose the promotion of research in the field of gravitation in Europe. In this connection and in particular, the Consortium pursues the following objectives: –ensures the end of the construction of the antenna VIRGO, its operation, maintenance and the upgrade of the antenna as well as its exploitation; –ensures the maintenance of the related infrastructures, including a computer centre and promotes an open co-operation in R&D; –ensures the maintenance of the site; –carries out any other research in the field of gravitation of common interest of the Members; –promotes the co-operation in the field of the experimental and theoretical gravitational waves research in Europe; –promotes contacts among scientists and engineers, the dissemination of information and the provision of advanced training for young researchers.

5. 5 EGO 5 year renewal approved this year Current members: CNRS, INFN participating equally to budget (ca 10 M€ / year) Management: –EGO Council and its President –Board of auditors –EGO Director, EGO Scientific Director –Head of Departments (Administration, Infrastructures, Operations, Computing, Technical coordination) Scientific and Technical Advisory Committee –Experts of the field or of related questions VESF:Virgo-EGO Scientific Forum –Implementation of one of the EGO purposes –Gathers people interested in gravitational waves and their detection

6. 6 EGO/Virgo organization EGO Council Chairman EGO Council EGO Director Computing Technical coordination Infrastructures Administration Operations EGO Scientific Director Virgo Spokesperson Virgo Steering Committee Outreach Commissioning coordinator Data Analysis Advanced Virgo Coordinator Detector coordinator STAC

7. 7 The site of Cascina

8. 8 The Virgo interferometer

9. 9 Test Mass Suspension High performance vibration isolation system (Superattenuator) part of Virgo since the beginning Compliant with AdV sensitivity

10. 10 Virgo Progress

11. 11 May 2008 Virgo noise budget Eddy currents noise? Noise budget P 0 =8W, no TCS Some technical noises expected to go down with TCS  laser power increase Many environmental noises and control noises below 50 Hz are at the level of the Virgo design (magnetic and diffused light not shown here)  could explain a large fraction of the noise at low frequency  Shutdown works: see results at restart Eddy currents noise (if any) will be reduced with smaller magnets

12. 12 Virgo sensitivity: April 2008 LIGO at design sensitivity: technology demonstrated Virgo is not far. Getting closer to target at low frequency.

13. 13 Shutdown work on the detector Laser and Injection system upgrade –Power laser (60 W) with long pumping fibers –Pre mode cleaner –Faraday isolator –Mode cleaner upgrade –Characterization and thermal effects Thermal Compensation System –Simulation effort –Ring part installed in both towers –Mirror central part to be installed in the next weeks –Ready to start debugging Electronics installation –New ADC –New coil drivers –New DSP being debugged in NI Infrastructure work –Electric power and ground –Acoustic and vibration noise mitigation Everything relevant for Advanced Virgo More from the Detector coordinator

14. 14 Monolithic suspensions (Det talk) A new “ear” and attachment design allows to produce good fibers with a simple structure Will test the full procedure on a mirror Provided LF technical noise is controlled, there is a factor 30 in rate for NSNS coalescences adopting the monolithic suspensions Trade off study between science return and downtime of the monolithic installation in late 2009/early 2010. –monolithic suspension open the range of low frequencies to observations of periodic sources. –shutdown and re-commissioning reduce common observation time with LIGO, limiting its impact Very valuable experience with a central element of AdvVirgo.

15. 15 Michele Punturo: NE incident description Broken Viewports May 9,2008 From inside From outside first failing secondary

16. 16 North End Viewport recovery Interferometer back in safe conditions since end September Mirror was coated, equipped and suspended Back in the NE tower First beams back in the full interferometer today Expected not to happen again (in Advanced Virgo)!

17. 17 Data Analysis LV integration is progressing (good f2f in Amsterdam) –Speed up publication time Learn about LV differences –Detection committee and management of “events” –Proposal for Swift Target of Opportunity: opening to the external world, mutimessenger astronomy Increase in computing resources: negotiation with Computing Centers Setting up low latency analysis for VSR2 to provide trigger with direction information –Timely calibration –Data quality flags –Noise analysis

18. 18 Some recent publications Alessandra Corsi Search for gravitational waves associated with GRB 050915a using the Virgo detector Class. Quantum Grav. 25 (2008) 225001 (20pp) Gianluca Guidi First joint gravitational waves search by the AURIGA-EXPLORER-NAUTILUS- Virgo collaboration Class. Quantum Grav. 25 (2008) 205007 (20pp) F. Bondu A laser with an in-loop frequency stability of 1e -21 on a 100 ms time-scale for gravitational wave detection L. Bosi Virgo Status Class. Quantum Grav. 25 (2008) 184001 (9pp) I. Fiori Noise studies during the first Virgo science run and after, Class. Quantum Grav. 25 (2008) 184003 (8pp) F. Frasconi VIRGO: a large interferometer for gravitational wave detection started its first scientific run J. Phys.: Conf. Ser. 120 (2008) 032007 (7pp) V. Re A cross-correlation method to search for gravitational wave bursts with AURIGA and Virgo Class. Quantum Grav. 25 (2008) 114046 (11pp) Z. Marka Astrophysically triggered searches for gravitational waves: status and prospects Class. Quantum Grav. 25 (2008) 114051 (12pp) H. Heitmann Status of Virgo Class. Quantum Grav. 25 (2008) 114045 (8pp) Lisa Barsotti Lock acquisition of the Virgo gravitational wave detector Interferometer Astroparticle Physics, 30 (2008) 29 (10pp) Eric Genin In-vacuum optical isolation changes in a Faraday isolator Applied Optics 47 (2008) 5853 (9pp) Eric Genin The Virgo 3-KM interferometer for gravitational wave detection J. Opt. A: Pure Appl. Opt. 10 (2008) 064009 (9pp) Detector paper sent to Editorial board!

19. 19 Collaboration Life New coordinators in place Groups that have joined recently are being integrated New manifestations of interest for participation in Virgo and Advanced Virgo Maintaining full commitment toward Virgo Scientific Run 2: –Interferometer commissioning is restarting now –to be started mid 2009 with maximum possible overlap with LIGO S6 Advanced Virgo –from pioneering phase to recognized goal for the collaboration