1. Potsdam, Germany 21.07.06 Identification and removal of glitches in GEO 600 Joshua Smith ILIAS WG1 21.07.06

2. Joshua Smith, Potsdam, Germany 21.07.06 Overview Tools: oGEO Summary pages omHACR oCoincident analysis oNoise projections Glitches: oOwl oDust oFrequency glitches oMID slow FB glitches oMagnetic field/mains Since start of S5 emphasis has shifted to data quality - works by: making lots of automatic characterization, mining this for information, finding source

3. Joshua Smith, Potsdam, Germany 21.07.06 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

4. Joshua Smith, Potsdam, Germany 21.07.06 Coincident analysis

5. Joshua Smith, Potsdam, Germany 21.07.06 Owl

6. Owl gone??? Not seen after work on the signal-recycling longitudinal error signal module oBroken switch from one error signal to another oThis can’t be the cause of the owl, since owl existed before this module Gone for good?

7. Joshua Smith, Potsdam, Germany 21.07.06 Dust

8. Power glitches Detector output Input port power

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

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

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

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

13. Joshua Smith, Potsdam, Germany 21.07.06 Frequency glitches

14. Joshua Smith, Potsdam, Germany 21.07.06 Characteristics 0s60s Shows up most strongly in PR FB Couples via frequency noise (PR EP)

15. Joshua Smith, Potsdam, Germany 21.07.06 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)

16. Joshua Smith, Potsdam, Germany 21.07.06 PR setup

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

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

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

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

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

22. Joshua Smith, Potsdam, Germany 21.07.06 Hourly mains glitches Hourly series start: o24 secs after GPS hour o10 secs after UTC hour 24s

23. Joshua Smith, Potsdam, Germany 21.07.06 Mag./mains coinc. with H Frequency [Hz] Magnetometer central building ~ 50coinc./8hrs Time-freq glitch maps Time-shifted coincidence Mains monitor central building ~ 30coinc./8hrs Time [h] 0088 50 0 0 Time shift [s] 1 1 Frequency [Hz]

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

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

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

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

28. Joshua Smith, Potsdam, Germany 21.07.06 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??

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

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