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

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

GWDAW 9, Annecy 2004 GEO600 optical layout 12W laser mode cleaner interferometer with dual recycling detector Attenuated to 2W 1% Transmission 1W 600m

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

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 actuator optical CAL P and Q

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) HP’ = (HP+HQ)/2 HQ’ = (HP-HQ)/2 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)

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

GWDAW 9, Annecy 2004 Report list Click for details

GWDAW 9, Annecy 2004 Details page Lock list Sensitivity overview 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