geo600 status update harald lück hannover, april 2005
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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 - PowerPoint PPT PresentationTRANSCRIPT
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GEO600 Status UpdateHarald LckHannover, April 2005
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S4Feb 22nd March 23rdTwo manned shifts/day (5-21 UTC), 1 expert on duty 8-8UTCOvernight SMS alarms to expert on dutyLocking statusDAQS (DCUs running, frame making, timing, calibration)TemperaturesVacuumInstrumental duty cycle 97.5%
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Typical S4 Sensitivityh [1/sqrt(Hz)]
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S4Glitchy periods within the first week
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Glitches occurred mainly during seismically quiet times
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Curing the glitches(temporarily)
(What is a jump? :-)
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Intermediate Mass of Mounting Unit 3 probably touched coil holder frame
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After unstickng MU3by rotating it
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BLRMS during S4
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Strange sine gaussian glitchesh [1/sqrt(Hz)]
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Strange sine gaussian glitches ctnd.
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Strange sine gaussian glitches ctnd.
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Calibration of GEO600Time-domain calibration methodOptimization routine quasi-continuously estimates parameters of optical responseCalibration lines give known differential arm-length disturbanceThese points are fit to a modelUpdate rate is 1Hz
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Michelson Servo Error PointsPQ
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On-line optical TF measurementsactuatorCALP and Q
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Optical&Electronic Gain
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Calibration
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Calibrated EP Quadrature Signalsh [1/sqrt(Hz)]
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Combining hP(t) and hQ(t) IIICreate filters from noise floor estimatesh(t) = Pfilter{hP(t)} + Qfilter{hQ(t)}sQQsPPsPQ
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Combining hP(t) and hQ(t) resultsGet the best of hP and hQ plus a little extra!h [1/sqrt(Hz)]
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Steps after S4PR fast autoalignment, Unity gain ~4-5Hz
Improve seismic long. FF & long.->IM tilt FFIncrease PR factor by changing PR mirror 1.35% -> 0.1%Change laser, increase power to ~12W, i.e. ~5W @ MPRLock interferometer with ~7kW internal power
TF fluctuates and depends on tuning