Status of Virgo Gabriele Vajente INFN Pisa and Scuola Normale Superiore di Pisa On behalf of the Virgo Collaboration 11 th Gravitational Wave Data Analysis Workshop Potsdam, December 18 th 2006

GWDAW 11 December 18 th, 2006 – Gabriele Vajente2 Virgo collaboration New groups joined the collaboration ESPCI Paris LAPP LAL Orsay LMA Lyon OCA INFN Perugia INFN Firenze INFN Napoli INFN Pisa INFN Roma 1 NIKHEF INFN Roma 2

GWDAW 11 December 18 th, 2006 – Gabriele Vajente3 Restart after shutdown Last winter shutdown for hardware upgrades Injection bench replacement to run with higher input power (10 W enter the ITF) Power Recycling mirror replacement with new monolithic mirror, higher reflectivity (95 %) PR mirror mechanical transfer function OLD NEW

GWDAW 11 December 18 th, 2006 – Gabriele Vajente4 Thermal issues Higher power produces thermal effects Lock acquisition long (~20 min) Thermal transient is a critical period Wait for 10 min after reaching dark fringe condition Needed a reduction of input power to 5.5 W (entering the ITF) Need for a thermal compensation system, work starting BS Pick-off power Lower sideband Higher sideband

GWDAW 11 December 18 th, 2006 – Gabriele Vajente5 WSR3 and WSR4 were canceled for bad conditions Week-end Science Run Periodic short data taking started in September 2006 start moving towards a science run operation take snapshots of the commissioning progress take clean data in controlled conditions light organization priority always on commissioning WSR1 September 08 th - 11 th WSR2 September 22 th - 25 th WSR3 October 06 th - 09 th WSR4 October 13 th - 16 th WSR5 November 10 th - 13 th WSR6 December 01 th - 04 th WSR7 January 12 th - 15 th

GWDAW 11 December 18 th, 2006 – Gabriele Vajente6 Sensitivity in WSRs

GWDAW 11 December 18 th, 2006 – Gabriele Vajente7 Comparison of sensitivity

GWDAW 11 December 18 th, 2006 – Gabriele Vajente8 Duty cycle and horizon in WSRs Horizon for NS NS (averaged) [MPc] WSR1 Duty cycle 87.7% Longest lock 15 h WSR2 Duty cycle 68.7% Longest lock 27 h WSR5 Duty cycle 64.2% Longest lock 10 h WSR6 Duty cycle 80.5% Longest lock 18 h

GWDAW 11 December 18 th, 2006 – Gabriele Vajente9 Dependence on weather conditions The horizon is affected by microseismic conditions Sea activity Wind Suspension control improvements on-going Horizon NS-NS optimal [MPc] Seismic activity [a.u.] RMS 220 mHz – 1 Hz RMS 30 mHz – 100 mHz

GWDAW 11 December 18 th, 2006 – Gabriele Vajente10 Noise budget Below 50 Hz control noise (longitudinal and angular) Above 1kHz frequency noise and shot noise Intermediate region WSR5

GWDAW 11 December 18 th, 2006 – Gabriele Vajente11 Acoustic noise / diffused light The main suspect is acoustic and seismic noise from benches in air Through diffused and scattered light effects Investigations on-going Projection of acoustic noise introduced by the detection bench, measured with acoustic noise injections

GWDAW 11 December 18 th, 2006 – Gabriele Vajente12 Brief overview of Data Analysis at Virgo Virgo search groups Bursts Binary inspirals Periodic signals Stochastic background Noise studies Virgo-Bars network Virgo-LIGO collaboration

GWDAW 11 December 18 th, 2006 – Gabriele Vajente13 Brief overview of Data Analysis at Virgo Virgo search groups Bursts Binary inspirals Periodic signals Stochastic background Noise studies Virgo-Bars network Virgo-LIGO collaboration Analysis of data quality (talk by E.Cuoco) Studies on veto procedures and efficiency (poster by M. Del Prete) Search fro bursts from GRB a (poster by A. Corsi)

GWDAW 11 December 18 th, 2006 – Gabriele Vajente14 Brief overview of Data Analysis at Virgo Virgo search groups Bursts Binary inspirals Periodic signals Stochastic background Noise studies Virgo-Bars network Virgo-LIGO collaboration On-line analysis perfomed using Merlino and MBTA algorithms (talk by L. B. Bosi) Study on coherent analysis with a network of ITF (poster by S. Birindelli) Improvements in the timing accuracy (poster by D. Grosjean)

GWDAW 11 December 18 th, 2006 – Gabriele Vajente15 Brief overview of Data Analysis at Virgo Virgo search groups Bursts Binary inspirals Periodic signals Stochastic background Noise studies Virgo-Bars network Virgo-LIGO collaboration Coincidence analysis between C6 and C7 run (talk by C.Palomba)

GWDAW 11 December 18 th, 2006 – Gabriele Vajente16 Brief overview of Data Analysis at Virgo Virgo search groups Bursts Binary inspirals Periodic signals Stochastic background Noise studies Virgo-Bars network Virgo-LIGO collaboration Analysis of prospect of detection in a network search Virgo/LSC (talk by G.Cella)

GWDAW 11 December 18 th, 2006 – Gabriele Vajente17 Brief overview of Data Analysis at Virgo Virgo search groups Bursts Binary inspirals Periodic signals Stochastic background Noise studies Virgo-Bars network Virgo-LIGO collaboration Search and removal of lines (poster by I. Fiori et al.)

GWDAW 11 December 18 th, 2006 – Gabriele Vajente18 Brief overview of Data Analysis at Virgo Virgo search groups Bursts Binary inspirals Periodic signals Stochastic background Noise studies Virgo-Bars network Virgo-LIGO collaboration Analyzed 24 hours of data in coincidence during Virgo C7 run ILIAS-WG2 methodological paper under preparation (Talk by L. Baggio)

GWDAW 11 December 18 th, 2006 – Gabriele Vajente19 Brief overview of Data Analysis at Virgo Virgo search groups Bursts Binary inspirals Periodic signals Stochastic background Noise studies Virgo-Bars network Virgo-LIGO collaboration Comparison of calibration and pipelines Methodological work on simulated data Exchanges of short data segments for developing and testing network analysis methods.

GWDAW 11 December 18 th, 2006 – Gabriele Vajente20 Prospects for the future Virgo WSRs Virgo commissioning Virgo+ upgrade Virgo+ commissioning Virgo+ Scientific Run Virgo commissioning TIME Virgo Scientific Run (in coincidence with S5)

GWDAW 11 December 18 th, 2006 – Gabriele Vajente21 Virgo+ 50 W laser, F=150 cavities Low loss suprasil end mirrors Monolitic suspensions Shot noise decreased Thermal noise decreased

GWDAW 11 December 18 th, 2006 – Gabriele Vajente22 Summary WSR program started and continuing with good duty cycle improving sensitivity (high frequency almost at measured shot noise, comparable with LIGO) Commissioning continues big efforts in the Hz region Goal to have a Science Run in coincidence with LSC S5 Plans for Virgo+ upgrade