Sensitivity of Virgo E. Tournefier (LAPP-CNRS) LSC-Virgo week May 23 rd,2007 LIGO-G070337-00-Z.

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Presentation transcript:

Sensitivity of Virgo E. Tournefier (LAPP-CNRS) LSC-Virgo week May 23 rd,2007 LIGO-G Z

Sensitivity: WSR10 (March) vs SR1 (May) 10

Noise budget

Control noises: longitudinal controls Beam Splitter motion  end mirrors differential motion  Noise introduced by the BS control can be compensated by moving the end mirrors Difficulty: the  -coefficient is frequency dependent  The BS noise is subtracted with a precision of ~ 2-3 % Other action: reduce the BS control noise itself + +  (f) - Laser - BS B5_ACq B1_ACp - BS longitudinal control loop Differential mode control loop PR mirror control also couples to DF => Similar online subtraction:  technique

Control noises: longitudinal noises BS control noise limits the sensitivity below 35Hz possible improvements: - more online subtraction - understand and reduce the control noise - B1_ACp - BS control noise - PR control noise Longitudinal noise budget

Control noises: angular Angular control noise couples through mirrors mis-centering  Improved centering (~mm)  Improved control filters  The angular noise does not limit the present Virgo sensitivity  Improvements will be needed to reach the Virgo design (some plans post-SR1) Angular noise budget

Mirror actuator noise Electronic noise of the coil drivers would limit the sensitivity  Shaping filters, more gain zCorr I (A) to mirror coil  The arm mirrors actuators need to be improved can be done during SR1 Longer term: new coil drivers

Environmental noise: acoustic noise Evidence for diffused light by the optics of the end benches (Jan 2007) Actions: 1/ use more rigid mounts for critical optics and dump secondary beams (Feb) 2/ install acoustic enclosures WSR7 WSR9: after 1/ Next steps: improvement to the acoustic enclosures

Environmental noises: magnetic noise Before WSR10 magnetic noise was limiting the sensitivity between 50 and 110 Hz Investigations: track the sources of magnetic field close to the mirrors => found noisy power supplies => noise well reduced when switched OFF! Home made portable magnetometer Dark fringe Need to check if there are still magnetic noise contributions to the present sensitivity

Environmental noise: others Replace SR turbo pump with a smaller one (+ other small improvements: diffused light, …) 10

Noise budget Noise reasonably well understood, some improvements planned except for… Still magnetic noise? Mystery noise

Observations: –Coupling to DF increases with misalignments –Sudden decreases/increases –Structures not excited with noise injections/tapping tests around benches/towers Under investigation …

First fixes / investigations Studies of drifts during lock longs: –Alignment drifts (quadrants centering)  Temporary fixes: realign from time to time  Improvements planned –Start to study effects of long term drifts: Variation of the coupling of control noises realignment - Quadrant alignment (BS alignment) - PR control noise coupling (  )