Transcript Status report of GEO600

Preparing GEO600 for
Gravitational Wave astronomy
(A status report)
Martin Hewitson, AEI Hannover
for GEO600
Talk overview
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Sensitivity of GEO600
Calibration update
Data quality indicators and information
GWDAW 9, Annecy 2004
GEO600 optical layout
600m
Attenuated to 2W
interferometer with
dual recycling
1W
mode cleaner
12W laser
1% Transmission
detector
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
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Time-domain calibration method
Optimisation routine is used to quasicontinuously estimate parameters of
optical response
Update rate is 1Hz
Output is LSC-standard h(t) frame files
GWDAW 9, Annecy 2004
Calibration procedure
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x
=
GWDAW 9, Annecy 2004
Correct for MI loop
and Optical
transfer
function(s)
On-line optical TF measurements
CAL
actuator
P and Q
optical
GWDAW 9, Annecy 2004
Calibration progress
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On-line calibration of both output
quadratures
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HP and HQ
Work on optimal combination is underway
Estimation of optical parameters in realtime 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)
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Idea is that
HP(t) = s(t) + np(t)
HQ(t) = s(t) + nq(t)
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So we can form
HP’ = (HP+HQ)/2
HQ’ = (HP-HQ)/2
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Do this in the time-domain to fit in with the current
calibration method
GWDAW 9, Annecy 2004
Combining HP and HQ - result
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GWDAW 9, Annecy 2004
HQ’ contains
almost no signal
compared to HP’
Where noise
behaves like cal
lines, we have
apparent
displacement
Useful diagnostic
for noise hunting
(?)
Introducing GEO Summary Pages
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A collection of automatically generated
web page reports about GEO data quality
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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
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Lock list
Sensitivity overview
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Data quality
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Quality channel, calibration parameters
Line catalogues
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Spectra, BLRMS, Inspiral range
Lines, harmonics, sidebands
Glitch rate
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Time-frequency plots, histograms
GWDAW 9, Annecy 2004
What’s coming up
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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