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 lasermode cleaner

interferometer with dual recycling

detector

Attenuated to 2WAttenuated to 2W

1% Transmission1% 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

CALP 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)/2HQ’ = (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

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

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