Commissioning, characterization and operation of the dual-recycled GEO 600

Smith, J. R.; Allen, B.; Aufmuth, P.; Aulbert, C.; Babak, S.; Balasubramanian, R.; Barr, B.; Berukoff, S. J.; Bunkowski, A.; Cagnoli, G.; Cantley, C. A.; Casey, M. M.; Chelkowski, S.; Churches, D.; Cokelaer, Thomas; Colacino, C. N.; Crooks, D. R. M.; Cutler, Curt; Danzmann, K.; Davies, R.; Dupuis, R. J.; Elliffe, E. J.; Fallnich, Carsten; Franzen, A.; Freise, A.; Goßler, S.; Grant, A.; Grote, H.; Grünewald, S.; Harms, J.; Heinzel, Gerhard; Heng, I. S.; Hepstonstall, A.; Heurs, M.; Hewitson, M.; Hild, S.; Itoh, Y.; Jones, R.; Huttner, S. H.; Kawabe, K.; Killow, C. J.; Kötter, K.; Krishnan, B.; Leonhardt, V.; Lück, H.; Machenschalk, B.; Malec, M.; Mercer, R. A.; Messenger, C.; Mohanty, S. D.; Mossavi, K.; Mukherjee, Sajal; Murray, P. G.; Nagano, S.; Newton, G.; Papa, M. A.; Perreur-Lloyd, M.; Pitkin, M.; Plissi, M. V.; Quetschke, V.; Re, V.; Reid, S.; Ribichini, L.; Robertson, D. I.; Robertson, N. A.; Romano, Joseph D.; Rowan, S.; Rüdiger, A.; Sathyaprakash, B. S.; Schilling, R.; Schnabel, R.; Schutz, B. F.; Seifert, F.; Sintes, A. M.; Sneddon, P.; Strain, K. A.; Taylor, Ian; Taylor, Richard J. E.; Thüring, A.; Ungarelli, C.; Vahlbruch, H.; Vecchio, A.; Veitch, J.; Ward, H.; Weiland, U.; Welling, H.; Williams, Peter; Willke, B.; Winkler, W.; Woan, G.; Zawischa, I.

doi:10.1088/0264-9381/21/20/016

Cited by 14 publications

(13 citation statements)

References 17 publications

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“…The first long-term operational test of this system was performed in the weeks prior to and during the coincident data-taking run S3 [6]. Two major problems were encountered.…”

Section: Resultsmentioning

confidence: 99%

“…The control signals for the MI length control were not noticeably effected. This system was used, and operated stably, during the entire S3 science run [6].…”

Section: Methodsmentioning

confidence: 99%

“…Seismic motion of the three foundations (one in each building), on which the tanks housing the core optics of the MI are built, is measured using three broadband tri-axial STS-2 seismometers 6 . The approximate placement and orientation of these seismometers with respect to the MI is shown in figure 1.…”

Section: Designmentioning

confidence: 99%

“…For more information about the design and performance of GEO 600, see [5,6]. The core instrument of GEO 600 is a Michelson interferometer (MI), with two nearly orthogonal folded arms, each with a geometric length of 600 m. A simplified 4 layout of the MI is shown in figure 1.…”

Section: Introductionmentioning

confidence: 99%

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Feedforward correction of mirror misalignment fluctuations for the GEO 600 gravitational wave detector

Smith¹,

Grote²,

Hewitson³

et al. 2005

Class. Quantum Grav.

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The core instrument of the GEO 600 gravitational wave detector is a Michelson interferometer with folded arms. The five main optics that form this interferometer are suspended in vacuum by triple pendulums with quasimonolithic lower stages of fused silica. After installation of these pendulums in early 2003, a larger than expected coupling of longitudinal ground motion to tilt misalignment of the suspended optics was observed. Because of this, the uncontrolled misalignment of the optics during average conditions was several µrad Hz −1/2 in the frequency band around the pendulum resonance frequencies (0.5-4 Hz). In addition, it was found that longitudinal control signals applied to the intermediate pendulum stages also resulted in excessive mirror tilt. The resulting misalignment exceeded the level tolerable for stable operation of GEO 600. In order to reduce the level of mirror tilt, a bipartite feedforward system was implemented. One part feeds signals derived from seismic measurements to piezo-electric crystals in the stacks supporting the suspensions, reducing the longitudinal motion of the uppermost suspension points

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“…The first long-term operational test of this system was performed in the weeks prior to and during the coincident data-taking run S3 [6]. Two major problems were encountered.…”

Section: Resultsmentioning

confidence: 99%

“…The control signals for the MI length control were not noticeably effected. This system was used, and operated stably, during the entire S3 science run [6].…”

Section: Methodsmentioning

confidence: 99%

Section: Designmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Feedforward correction of mirror misalignment fluctuations for the GEO 600 gravitational wave detector

Smith¹,

Grote²,

Hewitson³

et al. 2005

Class. Quantum Grav.

Self Cite

View full text Add to dashboard Cite

show abstract

“…GEO 600 [1] is an interferometric gravitational wave detector based near Hannover, Germany. The optical layout of GEO 600 is based on a standard Michelson interferometer with the addition of two mirrors: the power-recycling mirror (PR) and the signal-recycling mirror (SR).…”

Section: Introductionmentioning

confidence: 99%

Using the null-stream of GEO 600 to veto transient events in the detector output

Hewitson

Ajith

2005

Class. Quantum Grav.

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A network of gravitational wave detectors is currently being commissioned around the world. Each of these detectors will search for gravitational waves from various astronomical sources. One of the main searches underway is for un-modelled, transient gravitational wave events. The nature of these signals is such that it will be difficult to distinguish them from bursts of instrumental noise that originate in or around the detector and which then couple to the main detector output. One way to deal with this is to look for events that are coincident in more than one gravitational wave detector. However, with very large event lists (potentially thousands of events per day per detector), the number of events that pass this test due to random chance can still be large. At each detector site, various methods are being developed to veto instrumental bursts from lists of candidate events from that particular detector. This reduces the size of the event lists of each detector, and hopefully the final coincident event list, to a more manageable level. This paper presents one such veto method that can be used to veto certain classes of transient events detected in the output data stream of GEO 600. The method uses events detected in the null-stream output of GEO 600 (which contains, in principle, no gravitational wave signal) with a threshold to veto events detected in the main strain output. We show that, for the certain types of signals tested, the method is very robust, delivering high efficiency for a very low false-veto rate. In particular, it is shown that when applied to real detector data, the method is able to strongly veto a certain type of events which appear around 370 Hz in the detector output.PACS numbers: 95.55. Br, 95.75.Kk, 04.80.Nn, 95.55.Ym

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A 3+1 perspective on null hypersurfaces and isolated horizons

2006

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The isolated horizon formalism recently introduced by Ashtekar et al. aims at providing a quasi-local concept of a black hole in equilibrium in an otherwise possibly dynamical spacetime. In this formalism, a hierarchy of geometrical structures is constructed on a null hypersurface. On the other side, the 3+1 formulation of general relativity provides a powerful setting for studying the spacetime dynamics, in particular gravitational radiation from black hole systems. Here we revisit the kinematics and dynamics of null hypersurfaces by making use of some 3+1 slicing of spacetime. In particular, the additional structures induced on null hypersurfaces by the 3+1 slicing permit a natural extension to the full spacetime of geometrical quantities defined on the null hypersurface. This 4-dimensional point of view facilitates the link between the null and spatial geometries. We proceed by reformulating the isolated horizon structure in this framework. We also reformulate previous works, such as Damour's black hole mechanics, and make the link with a previous 3+1 approach of black hole horizon, namely the membrane paradigm. We explicit all geometrical objects in terms of 3+1 quantities, putting a special emphasis on the conformal 3+1 formulation. This is in particular relevant for the initial data problem of black hole spacetimes for numerical relativity. Illustrative examples are provided by considering various slicings of Schwarzschild and Kerr spacetimes.Comment: numerous corrections, references added, 224 pages, 21 figures, Physics Reports, in pres

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Commissioning, characterization and operation of the dual-recycled GEO 600

Cited by 14 publications

References 17 publications

Feedforward correction of mirror misalignment fluctuations for the GEO 600 gravitational wave detector

Feedforward correction of mirror misalignment fluctuations for the GEO 600 gravitational wave detector

Using the null-stream of GEO 600 to veto transient events in the detector output

A 3+1 perspective on null hypersurfaces and isolated horizons

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