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GEO600 Status Update Harald Lück Hannover, April 2005

GEO600 Status Update Harald Lück Hannover, April 2005. S4. Feb 22nd – March 23rd Two manned shifts/day (5-21 UTC), 1 ‚expert on duty‘ 8-8UTC Overnight SMS alarms to ‚expert on duty‘ Locking status DAQS (DCUs running, frame making, timing, calibration) Temperatures Vacuum

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GEO600 Status Update Harald Lück Hannover, April 2005

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  1. GEO600 Status UpdateHarald LückHannover, April 2005

  2. S4 • Feb 22nd – March 23rd • Two manned shifts/day (5-21 UTC), 1 ‚expert on duty‘ 8-8UTC • Overnight SMS alarms to ‚expert on duty‘ • Locking status • DAQS (DCUs running, frame making, timing, calibration) • Temperatures • Vacuum • Instrumental duty cycle 97.5%

  3. Calibration lines Violin modes Laser power PR, E highV, EN lowV N * 50Hz MC Turbo SR ‚Typical‘ S4 Sensitivity h [1/sqrt(Hz)]

  4. S4 Glitchy periods within the first week

  5. Glitches occurred mainly during seismically quiet times

  6. Curing the glitches(temporarily)(What is a jump? :-)

  7. Intermediate Mass of Mounting Unit 3 probably touched coil holder frame

  8. After ‚unstickíng‘ MU3 by rotating it

  9. BLRMS during S4

  10. Strange sine gaussian glitches h [1/sqrt(Hz)]

  11. Strange sine gaussian glitches ctnd.

  12. Strange sine gaussian glitches ctnd.

  13. Calibration of GEO600 • Time-domain calibration method • Optimization routine quasi-continuously estimates parameters of optical response • Calibration lines give known differential arm-length disturbance • These points are fit to a model • Update rate is 1Hz

  14. Michelson Servo Error Points Q P

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

  16. Optical&Electronic Gain

  17. Calibration

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

  19. Combining hP(t) and hQ(t) – III • Create filters from noise floor estimates sQQ sPP sPQ h(t) = Pfilter{hP(t)} + Qfilter{hQ(t)}

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

  21. Steps after S4 • PR fast autoalignment, Unity gain ~4-5Hz √ • Improve seismic long. FF & long.->IM tilt FF • Increase PR factor by changing PR mirror 1.35% -> 0.1% • Change laser, increase power to ~12W, i.e. ~5W @ MPR • Lock interferometer with ~7kW internal power

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