GEO600 Status Update Harald Lück Hannover, April 2005
Jan 24, 2016
GEO600 Status UpdateHarald LckHannover, April 2005
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%
Typical S4 Sensitivityh [1/sqrt(Hz)]
S4Glitchy periods within the first week
Glitches occurred mainly during seismically quiet times
Curing the glitches(temporarily)
(What is a jump? :-)
Intermediate Mass of Mounting Unit 3 probably touched coil holder frame
After unstickng MU3by rotating it
BLRMS during S4
Strange sine gaussian glitchesh [1/sqrt(Hz)]
Strange sine gaussian glitches ctnd.
Strange sine gaussian glitches ctnd.
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
Michelson Servo Error PointsPQ
On-line optical TF measurementsactuatorCALP and Q
Optical&Electronic Gain
Calibration
Calibrated EP Quadrature Signalsh [1/sqrt(Hz)]
Combining hP(t) and hQ(t) IIICreate filters from noise floor estimatesh(t) = Pfilter{hP(t)} + Qfilter{hQ(t)}sQQsPPsPQ
Combining hP(t) and hQ(t) resultsGet the best of hP and hQ plus a little extra!h [1/sqrt(Hz)]
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