MAX-PLANCK-INSTITUT FÜR GRAVITATIONSPHYSIK ALBERT-EINSTEIN-INSTITUT 2001-07-10Karsten Kötter1 Detector Characterization of GEO600 4th Edoardo Amaldi Conference.

MAX-PLANCK-INSTITUT FÜR GRAVITATIONSPHYSIKALBERT-EINSTEIN-INSTITUT

2001-07-10 Karsten Kötter 1

Detector Characterization of GEO600

4th Edoardo Amaldi ConferenceOn Gravitational Waves

UWA - Perth, Australia

Karsten Kötter - 2001-07-10


MAX-PLANCK-INSTITUT FÜR GRAVITATIONSPHYSIK - ALBERT-EINSTEIN-INSTITUT

Detector Characterization (1)

•First Phase:Improve Detector Performance• identify noise sources• track down transients

•Detector is a large and complex device• data from many sensors have to be

monitored (and recorded) at the same time• detector data• environmental data



Detector Characterization (2)

•Second Phase:create vetoes for h-channel• external influences make data from h-

channel invalid• periods of invalid data have to be

marked• understand noise propagation in detector• determine thresholds in environmental

disturbances that affect h-channel



Available channels

C e ntra l Sta tio n:32 c ha nne ls a t 16384Hz SR64 c ha nne ls a t 512Hz SRc a . 800 c ha nne ls a t ~ 5Hz (c o ntro l syste m )

No rth End Sta tio n:16 c ha nne ls a t 16384Hz SR

Ea st End Sta tio n:16 c ha nne ls a t 16384Hz SR



environmental channels (1)

•already available sensors• magnetic field• seismic motion

• foundation• suspension system

• power line• indoor/outdoor temperature• acoustics (air/tanks)• wind speed/direction



environmental channels (2)

•planned• air pressure• vacuum pressure• electric field



detector channels

•Mode Cleaner• PDH error point• visibility (reflected light)• auto-alignment

• rotation• tilt

• mirror positions



seismic noise spectrum



transient – seismic motion



transient - ModeCleaner control



coherence: seismic motion



transient - magnetic field



Detector signals during lightning



coherence: mag. field gradient



temperature fluctuations



Summary

• Detector characterization• detector improvement• h-channel vetoing

• DAQ system

• signals• detector• environment

• measurements• seismic noise• magnetic field• temperature correlation

MAX-PLANCK-INSTITUT FÜR GRAVITATIONSPHYSIK ALBERT-EINSTEIN-INSTITUT 2001-07-10Karsten Kötter1 Detector Characterization of GEO600 4th Edoardo Amaldi Conference.

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