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