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Gravitational Wave Research in Hannover and Potsdam Institute for Gravitation and the Cosmos Inaugural Conference August 9 – 11, 2007 Penn State University Gravitational Wave Research in Hannover and Potsdam Peter Aufmuth Albert-Einstein-Institut Leibniz Universität Hannover LIGO Scientific SFB/TR 7 Collaboration Max Planck Society „GW-Astronomie“ Albert Einstein Institute Experiment Theory Leibniz Universität Hannover Max-Planck-Institut für Gravitationsphysik Max-Planck-Institut Golm/Potsdam für Gravitationsphysik Hannover Evaluation of data; Gravitational wave calculation of sources detector GEO600 R&D for the next generation of gw detectors ALBERT-EINSTEIN-INSTITUT HANNOVER Albert Einstein Institute Hannover Golm / Potsdam Karsten Danzmann B. Allen G. Huisken B.F. Schutz H. Nicolai Institute for Laser Inter- Observational Geometric Quantum Astrophysical Gravitational ferometry & Relativity & Analysis & Gravity & Relativity Physics GW Astronomy Cosmology Gravitation Unified Theories Leibniz University Hannover Max Planck Institute for Gravitational Physics (AEI) ALBERT-EINSTEIN-INSTITUT HANNOVER Astrophysical Relativity Numerical solutions of Einstein’s equations theoretical modelling of GW sources special interest: evolution of binary black holes set-up of large-scale cluster computing facilities MERLIN ALBERT-EINSTEIN-INSTITUT HANNOVER GW Data Analysis M.A. Papa chair of LIGO continuous waves working group Einstein@Home: search for pulsars on home computers development of data analysis algorithms: Hough transform ALBERT-EINSTEIN-INSTITUT HANNOVER Gravitational Wave Detector GEO600 North end mirror 600 m A Michelson Interferometer laser + with 600 m armlength beam splitter central building 600 m end mirror East Institute of Floriculture, Tree Nursery Science and Plant Breeding ALBERT-EINSTEIN-INSTITUT HANNOVER Organization of GEO600 Max-Planck-Institut Institute for Gravitational für Gravitationsphysik, Research, Univ. Glasgow Potsdam und Hannover Leibniz Universität Hannover Cardiff University Max-Planck-Institut für Quantenoptik, Garching ALBERT-EINSTEIN-INSTITUT HANNOVER History of GEO600 Garching 30 m prototype 1975 MPI for Astrophysics (Garching) 3 m prototype 1983 MPI for Quantum Optics (Garching) 30 m prototype 1989 Cooperation with Glasgow group Ruthe 25 km south 1995 September 5th : of Hannover breaking ground for GEO600 2002 first science run (S1) together with LIGO K. Danzmann ALBERT-EINSTEIN-INSTITUT HANNOVER Impressions from the GEO Site workshop central building directional offices radio link high-tech in an austere environment clean room control room ALBERT-EINSTEIN-INSTITUT HANNOVER Worldwide Collaboration 3 km H1: 4 km 600 m H2: 2 km L1: 4 km 300 m AdvLIGO AIGO 80 m LIGO Scientific Collaboration ALBERT-EINSTEIN-INSTITUT HANNOVER GEO Specialty: Monolithic Suspensions Reaction pendulum Fused silica plates → test mass pendulum with two tips to weld thefibresonto Thermal noise reduction using ultra low-loss, quasi-monolithic fused silica suspensions fixed by means of hydroxy-catalysis bonding ALBERT-EINSTEIN-INSTITUT HANNOVER GEO Specialty: Dual Recycling output = carrier + sidebands shotnoise broadband fS = fL ± fgw PRM laser Recycling the carrier (laser) → power recycling SRM narrow-band signal dynamical tuning Recycling the sidebands (gw signal) → signal recycling Resonant enhancement of the signal amplitude Time (x 50) + tuning of the detector sensitivity ALBERT-EINSTEIN-INSTITUT HANNOVER GEO Specialty: Laser Development AdvLIGO laser: Together with the GEO600 laser system: 180 W cw output Laserzentrum Hannover 2 W cw Nd:YAG laser ∆P/P = 3·10–9/√Hz plus 35 W cw 4-head Nd:YVO4 amplifier ∆P/P = 2·10–8/√Hz Just delivered for use in EnhLIGO ! ∆f = 2·10–4/√Hz high-power slave laser 4-head amplifier ALBERT-EINSTEIN-INSTITUT HANNOVER GEO R&D – 3rd Generation GW Detectors Diffractive optics: Use gratings Quantum noise: use squeezed instead of transmissive components light to beat the standard quantum limit Littrow mounting Feed squeezed vacuum noise into the output port Shot noise with beam signal recycling splitter & squeezed light ALBERT-EINSTEIN-INSTITUT HANNOVER LISA & LISA Pathfinder Laser development: P = 1W Power stabilisation: ∆P/P < 2·10-4/√Hz Frequency reference: ∆f < 30 Hz/√Hz LISA Interferometric readout for LPF: Heterodyne interferometers Phase measurement system ∆φ = 2π·10–6 rad /√Hz L = 5 mio km L = 30 cm ALBERT-EINSTEIN-INSTITUT HANNOVER Schools & Collaborations International Max Planck Research School on Gravitational Wave Astronomy Doctoral program for students with Master or Diploma. In addition to their research work IMPRS on GWA advanced lecture courses are offered by the school. imprs-gw.aei.mpg.de Apply ! Special Research Area „Gravitational Wave Astronomy“ SFB/TR7 Research positions at the universities of Hannover, Jena, Tübingen and at GWA the MPI Astrophysics (Garching), AEI ALBERT-EINSTEIN-INSTITUT HANNOVER Congratulations ! Our best wishes for the IGC ! … & on good cooperation … kennislink.nl ALBERT-EINSTEIN-INSTITUT HANNOVER.
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