Abstract
The German-British laser-interferometric gravitational wave detector GEO 600 is in its 13th year of operation since its first lock in 2001. After participating in science runs with other first generation detectors, GEO 600 has continued collecting data as an astrowatch instrument with a duty cycle of 62% during the time when the other detectors have gone offline to undergo substantial upgrades. Less invasive upgrades to demonstrate advanced technologies and improve the GEO 600 sensitivity at high frequencies as part of the GEO-HF program have additionally been carried out in parallel to data taking. We report briefly on the status of GEO 600.
Highlights
GEO 600 [1] is the German-British laser-interferometric gravitational wave (GW) detector that was built in the late 1990s and started operation in the early 2000s [2, 3] in conjunction with other first generation GW detectors
Following the era of first generation detector science runs when the other observatories began going offline for substantial upgrades [7, 8], GEO 600 opted to serve the role of being the sole detector continuing to collect data through a program called Astrowatch
The primary techniques implemented include the injection of squeezed vacuum, a change in signal recycling bandwidth and operating point, DC readout with an output mode cleaner, and higher laser power combined with a thermal compensation system
Summary
GEO 600 [1] is the German-British laser-interferometric gravitational wave (GW) detector that was built in the late 1990s and started operation in the early 2000s [2, 3] in conjunction with other first generation GW detectors. The primary techniques implemented include the injection of squeezed vacuum, a change in signal recycling bandwidth and operating point, DC readout with an output mode cleaner, and higher laser power combined with a thermal compensation system. The marked degradation in strain sensitivity below 100 Hz arises from technical side effects of both DC readout and the new signal recycling mirror.
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