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Status of GEO600

Status of GEO600. Benno Willke for the GEO600 team. ESF Exploratory Workshop Perugia, September 2005. Workshop. Central Building. Offices. Control Room / Visitor Center. Bathrooms. container cluster 2005. Tube / Trench. Clean Room / Control Room. Triple Pendulum Suspension.

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Status of GEO600

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  1. Status of GEO600 Benno Willke for the GEO600 team ESF Exploratory Workshop Perugia, September 2005

  2. Workshop Central Building Offices Control Room / Visitor Center Bathrooms container cluster 2005

  3. Tube / Trench

  4. Clean Room / Control Room

  5. Triple Pendulum Suspension

  6. Thermal Noise / Monolithic Suspension Weld Silicate (Hydroxy- Catalysis) Bonding

  7. reaction pendulum

  8. interferometer with „dual recycling“ modecleaner 12W Laser detektor GEO 600 – optical layout

  9. Dual Recycling Length Control

  10. Michelson length control < 0.1Hz < 10 Hz • Reaction Pendulum: • 3 coil-magnet actuators at intermediate mass, range ~ 100µm • Electrostatic actuation on test mass bias 630V, range 0-900V= 3.5µm > 10 Hz

  11. +2 at MI (differential mode) +2 at Signal-Recycling cavity 16 spot position control Alignment Control Alignment Control 4 degrees of freedom at MC 1 +4 at MC 2 +4 at MI (common mode) + 20 = 36 differential wave-front sensing

  12. GEO 600 design sensitivity

  13. Evolution of the GEO 600 Sensitivity

  14. GEO600 Duty Cycle

  15. S4 • Feb 22nd – March 23rd, 708 hours • Two manned shifts/day (5-21 UTC), 1 „Expert-On-Duty“ 8-8UTC • Fully automated overnight shifts; SMS alarms to ‚E-O-D‘ • Locking status • DAQS (DCUs running, frame making, timing, calibration) • Temperatures • Vacuum • Instrumental duty cycle 97.5%, 95% w/o noisy period, 72%>10h • Longest lock 52h

  16. Sensitivity Min/max spectrum of h(t) 15 BLRMS of h(t) Inspiral monitor Spectrogram of h(t) Calibration Data quality Chi2 Calibration parameters Bursts (HACRmon) Time frequency distribution SNR distribution Duration Bandwidth Lines (Linemon) Line cataloguing Harmonic identification Sideband identification detector characterization

  17. Typical S4 Sensitivity • h(t): • derived from two quadratures of MI diff. EP • diff. calibration: estimation of optical gain + MID loop gain (for online calibration) • noise proj.: • calibration lines for various online noise projections • violin mode: • fiber modes from the monolithic suspension stage • MC turbo: turbo pump frequency (822 Hz) • Mains: 50 Hz and multiples from mains • h(t): • derived from two quadratures of MI diff. EP • diff. calibration: estimation of optical gain + MID loop gain (for online calibration) • noise proj.: • calibration lines for various online noise projections • violin mode: • fiber modes from the monolithic suspension stage • MC turbo: turbo pump frequency (822 Hz) • Mains: 50 Hz and multiples from mains • h(t): • derived from two quadratures of MI diff. EP • diff. calibration: estimation of optical gain + MID loop gain (for online calibration) • noise proj.: • calibration lines for various online noise projections • violin mode: • fiber modes from the monolithic suspension stage • MC turbo: turbo pump frequency (822 Hz) • Mains: 50 Hz and multiples from mains • h(t): • derived from two quadratures of MI diff. EP • diff. calibration: estimation of optical gain + MID loop gain (for online calibration) • noise proj.: • calibration lines for various online noise projections • violin mode: • fiber modes from the monolithic suspension stage • MC turbo: turbo pump frequency (822 Hz) • Mains: 50 Hz and multiples from mains • h(t): • derived from two quadratures of MI diff. EP • diff. calibration: estimation of optical gain + MID loop gain (for online calibration) • noise proj.: • calibration lines for various online noise projections • violin mode: • fiber modes from the monolithic suspension stage • MC turbo: turbo pump frequency (822 Hz) • Mains: 50 Hz and multiples from mains

  18. Calibration

  19. optical h On-line optical TF measurements P and Q CAL actuator

  20. radiation pressure calibrator Calibration ?

  21. Photon Pressure Calibrator Wavelength: 1035 nm @ 20°C Max. power: 1.4 W, FWHM= 0.66nm Good agreement with ESD calibration

  22. Optical Gain

  23. h [1/sqrt(Hz)] Calibrated EP Quadrature Signals

  24. Get the best of hP and hQ plus a little extra! Combining hP(t) and hQ(t) – results h [1/sqrt(Hz)]

  25. 1500W (typ.) 2000W (max)at Beam Splitter 1.6W 10W 5W ~40mW increase of power recycling factor Michelson Interferometer Mode Cleaners Laser T=0.09% Power Recycling Cavity: Mode matching >85% Finesse 8300 Linewidth 30 Hz Output Mode Cleaner 4/0.09%*1.6 = 7000

  26. Thermal lensing in BSoutput mode pattern (PRMI) A few minutes after relocking f= 8km → α≈0.3 +/- 0.05ppm/cm Directly after relocking f=20km

  27. GEO 600 design sensitivity

  28. lock acquisition at 5kHz tuning needs to adjust of 6 parameters (look-up table) improved input file for simulations and how to transfer results to experiment achieved downtuning to 200Hz MI AA instability could be fixed Tuning signal recycling to 300 Hz

  29. Interferometer Readout - Sidebands mirror laser phasemodualtor beam splitter mirror photodetector

  30. Schnupp – Modulation mirror laser phasemodualtor beam splitter mirror photodetector

  31. Gravitational Wave Side Bands mirror laser phasemodualtor beam splitter mirror photodetector

  32. Detuned Signal Recycling mirror laser phasemodualtor beam splitter mirror photodetector

  33. PRC 72 * D ( 765Hz) 72 * D ( 765Hz) 119* D (1.26kHz) 119* D (1.26kHz) SRC broad- band 1.86kHz 2.3kHz 1.1kHz 2.2kHz SRC detuned to 1.1 kHz -119 * f -72 * f 0 72 * f 119 * f PRC PRC PRC PRC SR-sidebands SR-sidebands SR-sidebands carrier MI-sidebands broadband 1.1kHz detuned 2kHz detuned Unbalanced Sidebands

  34. Signal Recycling digital • digital loop allows for steep filter • noise contribution reduced by up to a factor of 200

  35. Sqrt circuits in MI loop ESD: F  U^2 Sqrt circuits are necessary to give full linear force range for acquisition. Drawback: sqrt circuits are noisy 1µV/sqrt(Hz) (=100µV/sqrt(Hz) @ ESD)

  36. dewhiten dewhiten dewhiten Whiten MI loop whitening / dewhitening Whitening right after mixer: zero 3.5 Hz pole 35 Hz Dewhitening for both split passes Passive dewhit-ening done in HV path (0-1kV)

  37. sensitivity improvements since July

  38. Evolution of the GEO 600 Sensitivity

  39. Current vs. Design sensitivity

  40. Non-stationary Noise

  41. Near Future • finish commissioning • increase circulating power • find source of optical losses in PR cavity • increase MI loop gain between 1-10 Hz • improve RF circuitry • optimize stability • join S5 in overnight/weekend mode until commissioning is finished • fully join S5

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