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The AEI 10 m prototype interferometer

The AEI 10 m prototype interferometer. Stefan Goßler for the 10 m prototype team. DPG, March 2009. Purpose of our prototype. Maximal overlap with GEO-HF subsystems

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The AEI 10 m prototype interferometer

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  1. The AEI 10m prototype interferometer Stefan Goßler for the 10m prototype team DPG, March 2009

  2. Purpose of our prototype • Maximal overlap with GEO-HF subsystems • develop and prove as many of the techniques needed for GEO600 upgrades as possible (e.g. laser, digital control infrastructure) • provide training for people who will install and run GEO-HF • Ultra-low displacement noise test environment • to probe at and beyond the Standard Quantum Limit (SQL) for of order 100g to kilogram scale masses The AEI 10m prototype interferometer

  3. Vacuum system Volume ca. 100m3 22t stainless steel Tubes: 1.5m diameter Tanks: 3m diameter, 3.4m tall Roughing: One 170l/s screwpump Main pumps: Two 2000l/s turbo-molecularpumps Backing and differential pumping: Two scroll pumps 10-6mbarafterabout 12 hours The AEI 10m prototype interferometer

  4. In the prototype hall The AEI 10m prototype interferometer

  5. 180° view The AEI 10m prototype interferometer

  6. Walk-in tanks 100mm flanges to fit feedthroughs 600mm flanges to fit viewports 100mm flanges to fit feedthroughs 03.03.2009 The AEI 10m prototype interferometer

  7. Isolatedopticaltables Experimental platform GAS Filters Invertedpendulumlegs See nexttalkby Katrin Dahl forfulldetails Prototype of passive isolationtable at MIT LASTI HAM-SAS The AEI 10m prototype interferometer

  8. Suspension platform interferometer Based on LISA Pathfinder phase meter Mach-Zehnder interferometer with unequal arm length (by 20m), requires stable laser to reach design sensitivity of 100pm/sqrt(Hz) @ 10mHz: Iodine-stabilised Nd:YAG Thermal drift requires components to be bonded onto plate with low CTE Digital signalsfromFPGAsneedcustominterfaceto digital controlsystem See talkby Oliver Kranz Q31.4 forfulldetails The AEI 10m prototype interferometer

  9. Mirror suspensions Upper mass Second mass Penultimate mass Mirror Pre-installedsuspension cartridge Monolithic last stage 100g mirror, four 20µm silicafibres The AEI 10m prototypeinterferometer

  10. Light source: 35W @ 1064nm • Crystals: 3 x 3 x 10 mm3 Nd:YVO4 8 mm 0,3 % dot. 2 mm undopedendcap • Pump diode: 808nm, 45W 400µm fiber diameter NA=0,22 • Amplifier: 38W for 2W seed and 150W pump The AEI 10m prototype interferometer

  11. Digital control Based on real-time Linux system and EPICS software 6 x 32 channel PCI-X DA/AD & DIO Opteron based, 64bit real-time Linux Experiment sensors & actuators Workstation Field box Expansion chassis Front end 10GHz Signal conditioning AA/AI Linux, Simulink based input Fibre link for real-time network Timing slave Frame builder Timing master GPS clock The AEI 10m prototype interferometer

  12. Optical layout Optional: Signal recycling ~35W input @ 1064nm 10m Fabry-Perot arm cavity Finesse ca. 700 Tap off ~130mW Optional: Power recycling 100g Mirrors monolithicsilicasuspensions Frequencyreferencecavity Length: 12 m Finesse: ca. 7500 Triplependulumsuspension Mirror mass: 860 g Anti-resonant Fabry-Perotcavity as compound end mirror See talkbyFumikoKawazoe aboutreferencecavity The AEI 10m prototype interferometer

  13. Noisebudget The AEI 10m prototype interferometer

  14. The team • Ken Strain: Scientific leader • Stefan Goßler: Coordinator • KasemMossavi: Vacuum system and pumps control • Jens Breyer: Mechanical design • BennoWillke: High power laser • Gerhard Heinzel: LISA/LPF related experiments • Yanbei Chen, KentaroSomiya, Stefan Danilishin, Henning Rehbein, HelgeMüller-Ebhardt: Noise analysis, experiment design • Roman Schnabel: Squeezing and QND experiments • HaraldLück: Vacuum system and GEO 600 related experiments • HartmutGrote: Electronics and GEO 600 related experiments • GerritKühn, Michael Born, Martin Hewitson: Real time control system • GEO operators: Filter design and construction, environmental monitoring • Andreas Weidner: Electronics design • Henning Ryll: Laser and fibre-modecleaner • Katrin Dahl (PhD), Oliver Kranz(diploma): Suspension platform interferometer  • Bob Taylor (postdoc): Seismic isolation and control • Alexander Wanner(PhD): Inertial control • Fumiko Kawazoe (postdoc): Frequency reference cavity and global control • Alessandro Bertolini: Seismic isolation • Tobias Westphal(PhD): Monolithic suspensions • Christian Gräf(PhD): RT control • Thomas Brockt(Diploma): Power supplies and voltage distribution • Daniel Gering (Diploma): Interface Phase Meter - CDS The AEI 10m prototype interferometer

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