Novemebr 5, 2006 LSC meeting 1

Virgo Update

Prospects on detector performance and running schedules

B. Mours

Novemebr 5, 2006 LSC meeting 2

Recent Activities

Commissioning activity focused on Detector/Sensitivity improvements:

» Fix & optimize a faraday tuning

» Add acoustic isolation in the laser lab

» Coil drivers electronic upgrade

» Increase the clear aperture of a window

» Beam Matching/centering

» Controls tuning…

Almost shot noise limited at high frequency Started Week-end Science Run (WSR)

Take data during week-end» Shake down the shifts organization, on call procedures, data transfer…

» Provide stable data for online analysis, noise studies, and offline pipelines

2 WSR in Sept with good duty cycle (88% and 69%) 2 WSR in October canceled due to interferometer instabilities

» Recovery from faraday tuning and acoustic enclosure work not completed at that time

» Only one week time between the two of them

Novemebr 5, 2006 LSC meeting 3

Virgo WSR1 sensitivity

Novemebr 5, 2006 LSC meeting 4

BNS Horizon

BNS Horizon, optimal orientation;

SNR=8;

WSR1

WSR2

Red curve = 2.7 Mpc-(wind+sea)WSR1

Red curve: 2.7 Mpc -(wind+sea)WSR2

Novemebr 5, 2006 LSC meeting 5

WSR1: BNS Triggers(0.9-3M)

Basic cuts + reflected power (“B2”) stability

Novemebr 5, 2006 LSC meeting 6

WSR1: Burst Triggers (MF)

SNR>15

White noise+ HI

Photodiode B1d2 or B1d3 saturation

Limited set of basic cuts Ongoing study to define data quality cuts / vetoes

Novemebr 5, 2006 LSC meeting 7

WSR1 Noise Budget

Control noises

(PR, BS) Actuators noise

Frequency noise

shot noise

Novemebr 5, 2006 LSC meeting 8

What next ?

Next months: Some detector work:

» Add wedges on some auxiliary beams, Additional acoustic enclosure Continue Commissioning

» Improve stability vs weather– Work on the controls (suspension, alignment, …)

Noise hunting» Focus on the intermediate frequency band

One WSR every 3-4 weeks according to schedule of hardware changes» At least one week of noise hunting before a WSR

Move to 24/7 Science data taking We want several months of coincidence with S5 We need to match the LIGO sensitivity in part of the spectrum Starting date TBD, in the first part of 2007

2008: Shutdown for Virgo+ 50W laser, Monolithic suspension, new digital electronics …