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Identification and removal of glitches in GEO 600

This overview discusses the emphasis on data quality in the GEO600 project and the tools used for glitch identification and removal. It explores various glitches such as owl, dust, frequency glitches, MID slow FB glitches, and magnetic field/mains glitches. The analysis methods, including mHACR and coincident analysis, are also explained.

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Identification and removal of glitches in GEO 600

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  1. Identification and removal of glitches in GEO600 Joshua Smith ILIAS WG1 21.07.06 Potsdam, Germany 21.07.06

  2. Overview Since start of S5 emphasis has shifted to data quality - works by: making lots of automatic characterization, mining this for information, finding source • Tools: • GEO Summary pages • mHACR • Coincident analysis • Noise projections • Glitches: • Owl • Dust • Frequency glitches • MID slow FB glitches • Magnetic field/mains Joshua Smith, Potsdam, Germany 21.07.06

  3. mHACR • Time-frequency map of excess power (based on HACR) • Used to search for burst-like events • Matlab routine run on cluster (Martin & Ajith) • whitens data, removes lines • writes events to database • queried by mysql/matlab HACR: what’s that?? -Heating, Air Conditioning & Refrigeration -Helicopter Active Control Rotor -Hierarchical Algorithm for Curves and Ridges -High Accuracy Cryogenic Radiometer -Hispanic Association on Corporate Responsibility Joshua Smith, Potsdam, Germany 21.07.06

  4. Coincident analysis Joshua Smith, Potsdam, Germany 21.07.06

  5. Owl Joshua Smith, Potsdam, Germany 21.07.06

  6. Owl gone??? • Not seen after work on the signal-recycling longitudinal error signal module • Broken switch from one error signal to another • This can’t be the cause of the owl, since owl existed before this module • Gone for good? Joshua Smith, Potsdam, Germany 21.07.06

  7. Dust Joshua Smith, Potsdam, Germany 21.07.06

  8. Power glitches Input port power Detector output Joshua Smith, Potsdam, Germany 21.07.06

  9. Back-coupling? Strain back-coupling doesn’t explain instrumental channel coincidence Projection from detector output to laser power Dark port DC Power Strain coupling to DC power Joshua Smith, Potsdam, Germany 21.07.06

  10. Power glitches vs. dust Particle count Dark port DC power glitch count Dark port DC power glitch count Dark port DC power glitch count Input port DC power glitch count Joshua Smith, Potsdam, Germany 21.07.06 0 Time [m] 180

  11. Particle waves filtered 14020 455 (Particles/cu.ft)/1000 30.2 A a Joshua Smith, Potsdam, Germany 21.07.06

  12. Dust made loudest glitches Det. output BLRMS @~ 170Hz Time [h] Time [h] Before filter After filter Joshua Smith, Potsdam, Germany 21.07.06

  13. Frequency glitches Joshua Smith, Potsdam, Germany 21.07.06

  14. Characteristics 0s 60s • Shows up most strongly in PR FB • Couples via frequency noise (PR EP) Joshua Smith, Potsdam, Germany 21.07.06

  15. Removing glitches • Traced main glitches to a saturation somewhere in modecleaner2 loop. • Drastically improved with 2x reduction of RF modulation depth (compensated by digital gain) Joshua Smith, Potsdam, Germany 21.07.06

  16. PR setup Joshua Smith, Potsdam, Germany 21.07.06

  17. Before and after PR loop feedback H Joshua Smith, Potsdam, Germany 21.07.06

  18. Glitches back, a mystery HACR plots from last week Joshua Smith, Potsdam, Germany 21.07.06

  19. Magnetic fields / Mains Joshua Smith, Potsdam, Germany 21.07.06

  20. Magnetic field glitches H glitches B glitches Linear coupling, coherence Joshua Smith, Potsdam, Germany 21.07.06

  21. Magnetic field “projection” • B-field nearly limiting noise around 100Hz? • Coupling not yet understood • Checks: magnetometer measures B-field, IFO back-coupling ruled out Joshua Smith, Potsdam, Germany 21.07.06

  22. Hourly mains glitches 24s • Hourly series start: • 24 secs after GPS hour • 10 secs after UTC hour Joshua Smith, Potsdam, Germany 21.07.06

  23. Mag./mains coinc. with H Magnetometer central building ~ 50coinc./8hrs Mains monitor central building ~ 30coinc./8hrs Time-freq glitch maps Frequency [Hz] Frequency [Hz] 0 8 0 8 Time [h] Time [h] 50 50 Time-shifted coincidence 0 0 Joshua Smith, Potsdam, Germany 21.07.06 1 1 -1 -1 Time shift [s] Time shift [s]

  24. MID slow FB gliches Joshua Smith, Potsdam, Germany 21.07.06

  25. Characteristics Looks like a switch! Joshua Smith, Potsdam, Germany 21.07.06

  26. Coincident with mains glitches Joshua Smith, Potsdam, Germany 21.07.06

  27. HACR History Plots May June July Joshua Smith, Potsdam, Germany 21.07.06

  28. Loose ends • Is the owl gone? • Is the dust concentration low enough? • Why did frequency glitches come back? • Are these related to power-up glitches? • How to solve mains glitches? • Are slow FB glitches caused by a switch? • Q for all: Glitch vs. Instability?? Joshua Smith, Potsdam, Germany 21.07.06

  29. The end 'falco tinnunculus', better know as 'Turmfalke' Joshua Smith, Potsdam, Germany 21.07.06

  30. Statistical dust veto? MID VIS veto TF map and timeshifted results Joshua Smith, Potsdam, Germany 21.07.06

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