gravitational wave research in hannover and potsdam

Institute for Gravitation and the CosmosInaugural ConferenceAugust 9 – 11, 2007

Penn State University

Gravitational Wave Researchin Hannover and Potsdam

Peter AufmuthAlbert-Einstein-Institut

Leibniz Universität Hannover

SFB/TR 7„GW-Astronomie“

LIGO ScientificCollaboration Max Planck Society

Albert Einstein Institute

Theory

Leibniz Universität HannoverMax-Planck-Institutfür GravitationsphysikGolm/Potsdam

Gravitational wavedetector GEO600

Evaluation of data;calculation of sources

Experiment

Max-Planck-Institutfür GravitationsphysikHannover

R&D for the nextgeneration 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 forGravitational

Physics

Laser Inter-ferometry &

GW Astronomy

ObservationalRelativity &Cosmology

GeometricAnalysis &Gravitation

AstrophysicalRelativity

QuantumGravity &

Unified Theories

Leibniz UniversityHannover Max Planck Institute for Gravitational Physics (AEI)


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


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


Gravitational Wave Detector GEO600

central buildingEast

Institute of Floriculture, Tree Nursery Scienceand Plant Breeding

600 m

600 mlaser +

beam splitter

end mirror

A Michelson Interferometerwith 600 m armlength

North

end mirror


Organization of GEO600

Max-Planck-Institutfür Gravitationsphysik,Potsdam und Hannover

Institute for GravitationalResearch, Univ. Glasgow

Leibniz UniversitätHannover

Cardiff University

Max-Planck-Institut fürQuantenoptik, Garching


History of GEO600

1975 MPI for Astrophysics (Garching)3 m prototype

1983 MPI for Quantum Optics (Garching)30 m prototype

1989 Cooperation with Glasgow group

Garching 30 m prototype

Ruthe25 km southof Hannover

1995 September 5th : breaking ground for GEO600

2002 first science run (S1) together with LIGO

K. Danzmann


Impressions from the GEO Site

control room

workshopcentral building

officesdirectionalradio link

clean room

high-tech in an austere

environment


Worldwide Collaboration

AIGO

H1: 4 kmH2: 2 kmL1: 4 km

3 km600 m

80 mAdvLIGOLIGO ScientificCollaboration

300 m


GEO Specialty: Monolithic Suspensions


Thermal noise reduction using ultralow-loss, quasi-monolithic fusedsilica suspensions fixed by meansof hydroxy-catalysis bonding

Reaction pendulum→ test mass pendulum

Fused silica plateswith two tips to weld

the fibres onto

GEO Specialty: Dual Recycling

gwLS fff ±=

laser

signal

output = carrier + sidebands

Recycling the carrier(laser) → power recycling

Recycling the sidebands(gw signal) → signal recycling

PRM

SRM

shotnoisebroadband

Time

narrow-banddynamical tuning

Resonant enhancement of the signal amplitude(x 50) + tuning of the detector sensitivity


GEO Specialty: Laser Development

AdvLIGO laser:180 W cw output∆P/P = 3·10–9/√Hz

GEO600 laser system:2 W cw Nd:YAG laserplus 35 W cw 4-head

Nd:YVO4 amplifier∆P/P = 2·10–8/√Hz∆f = 2·10–4/√Hz

Together with theLaserzentrum Hannover

Just delivered for use in EnhLIGO !

high-power slave laser 4-head amplifier


GEO R&D – 3rd Generation GW Detectors

Diffractive optics: Use gratingsinstead of transmissive components

Quantum noise: use squeezedlight to beat the standardquantum limit

Littrowmounting Feed squeezed vacuum

noise into the output port

Shot noise withsignal recycling& squeezed light

beamsplitter


LISA & LISA Pathfinder

Laser development: P = 1WPower stabilisation: ∆P/P < 2·10-4/√Hz Frequency reference: ∆f < 30 Hz/√Hz

Interferometric readout for LPF:Heterodyne interferometersPhase measurement system∆φ = 2π·10–6 rad /√Hz

LISA

L = 5 mio km

L = 30 cm


Schools & Collaborations

IMPRS on GWA

International Max Planck Research Schoolon Gravitational Wave Astronomy

Doctoral program for students with Master or Diploma. In addition to their research workadvanced lecture courses are offeredby the school.

Apply !imprs-gw.aei.mpg.de

Special Research Area„Gravitational Wave Astronomy“

SFB/TR7GWA

Research positions at the universitiesof Hannover, Jena, Tübingen and atthe MPI Astrophysics (Garching), AEI


Congratulations !

Our best wishes for the IGC !

… & on good cooperation …

kennislink.nl


gravitational wave research in hannover and potsdam

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