Preparing GEO600 for Gravitational Wave astronomy (A status report) Martin Hewitson, AEI Hannover for GEO600

Talk overview Sensitivity of GEO600 Calibration update Data quality indicators and information GWDAW 9, Annecy 2004

GEO600 optical layout interferometer with dual recycling mode cleaner Attenuated to 2W interferometer with dual recycling 1W mode cleaner 12W laser 1% Transmission detector GWDAW 9, Annecy 2004

Sensitivity progress (highlights) HPD lock + SR bench scattering New MI+SR servo Typical S3 GWDAW 9, Annecy 2004

Target sensitivity GWDAW 9, Annecy 2004

Noise projections - HP Current HP ESD Feedback SR Feedback PDO Amp noise Shot+detection Uncorr sum GWDAW 9, Annecy 2004

Calibration of GEO600 Time-domain calibration method Optimisation routine is used to quasi-continuously estimate parameters of optical response Update rate is 1Hz Output is LSC-standard h(t) frame files GWDAW 9, Annecy 2004

Calibration procedure Correct for MI loop and Optical transfer function(s) x = GWDAW 9, Annecy 2004

On-line optical TF measurements P and Q optical actuator GWDAW 9, Annecy 2004

Calibration progress On-line calibration of both output quadratures HP and HQ Work on optimal combination is underway Estimation of optical parameters in real-time in control room On-line calibration leads to overnight runs GWDAW 9, Annecy 2004

HQ sensitivity progress GWDAW 9, Annecy 2004

Combining HP(t) and HQ(t) Idea is that So we can form Do this in the time-domain to fit in with the current calibration method HP(t) = s(t) + np(t) HQ(t) = s(t) + nq(t) HP’ = (HP+HQ)/2 HQ’ = (HP-HQ)/2 GWDAW 9, Annecy 2004

Combining HP and HQ - result HQ’ contains almost no signal compared to HP’ Where noise behaves like cal lines, we have apparent displacement Useful diagnostic for noise hunting (?) GWDAW 9, Annecy 2004

Introducing GEO Summary Pages A collection of automatically generated web page reports about GEO data quality To disseminate info about the growing amount of science data To aid in commissioning by having standard measurements to compare day by day. To learn about results of various analysis tools http://www.geo600.uni-hannover.de/georeports/ GWDAW 9, Annecy 2004

Report list Click for details GWDAW 9, Annecy 2004

Details page Lock list Sensitivity overview Data quality Spectra, BLRMS, Inspiral range Data quality Quality channel, calibration parameters Line catalogues Lines, harmonics, sidebands Glitch rate Time-frequency plots, histograms GWDAW 9, Annecy 2004

What’s coming up Injected power increase (x2 or more) Main high-power diode in vacuum New office buildings and toilets S4 Continue overnight and weekend runs Increase power-recycling factor Noise hunting and working towards design sensitivity GWDAW 9, Annecy 2004

The End GWDAW 9, Annecy 2004

Noise projections - HQ Current HP ESD Feedback SR Feedback PDO Amp noise Shot+detection Uncorr sum GWDAW 9, Annecy 2004