Potsdam, Germany Identification and removal of glitches in GEO 600 Joshua Smith ILIAS WG

Joshua Smith, Potsdam, Germany 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

Joshua Smith, Potsdam, Germany 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 Coincident analysis

Joshua Smith, Potsdam, Germany Owl

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?

Joshua Smith, Potsdam, Germany Dust

Power glitches Detector output Input port power

Joshua Smith, Potsdam, Germany 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

Joshua Smith, Potsdam, Germany 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

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

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

Joshua Smith, Potsdam, Germany Frequency glitches

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

Joshua Smith, Potsdam, Germany 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 PR setup

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

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

Joshua Smith, Potsdam, Germany Magnetic fields / Mains

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

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

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

Joshua Smith, Potsdam, Germany 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] Time shift [s] 1 1 Frequency [Hz]

Joshua Smith, Potsdam, Germany MID slow FB gliches

Joshua Smith, Potsdam, Germany Characteristics Looks like a switch!

Joshua Smith, Potsdam, Germany Coincident with mains glitches

Joshua Smith, Potsdam, Germany HACR History Plots MayJune July

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

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