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

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

3. 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

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

5. Target sensitivity
GWDAW 9, Annecy 2004

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

7. 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

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

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

10. 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

11. HQ sensitivity progress
GWDAW 9, Annecy 2004

12. 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

13. 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

14. 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

15. Report list
Click for details
GWDAW 9, Annecy 2004

16. 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

17. 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

18. The End
GWDAW 9, Annecy 2004

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