LIGO-G020407-00-W Summary of S1 at LIGO Hanford Observatory Fred Raab 9 September 02.

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Presentation transcript:

LIGO-G W Summary of S1 at LIGO Hanford Observatory Fred Raab 9 September 02

LIGO-G W Raab - Summary of S1 at LHO2 Clean Science Duty Cycle (segments > 300 seconds) H1 “science” duty cycle ~ 58% H2 “science” duty cycle ~ 73% Longest locked section exceeded 21 hours on H1 Nearly 100 hours of LIGO triple coincidence science data

LIGO-G W Raab - Summary of S1 at LHO3 Arm Powers

LIGO-G W Raab - Summary of S1 at LHO4 Rocky Start H1 had rough time coming into lock for run »All-night marathon delivers locked H1, 1 hour before S1 start, but re-locking was problematical for 1 st week »Alignment did not seem to be an issue, since initial buildups of were typical when it locked, but did not ease difficulty »Once locked, IFO remained locked for very long times H1 noise had large sensitivity to NSPOB »Variations of ~5x, depending on NSPOB »Needed NSPOB ~ for good noise »Lock robustness required NSPOB > 150, so we would take IFO out of science mode for alignment tweak when NSPOB hit 200

LIGO-G W Raab - Summary of S1 at LHO5 Operational Issues Continuous calibration lines at ~ 38, 974 Hz were a challenge »Conlog monitored enabling of AWG channels, but not whether they have amplitude »LineMon was thought to be working, but gave unreliable amplitude info because of a programming bug that was found late in run »AutoCalibration script left amplitude of calibration lines set to zero SensMon was uninterpretable due to problems with calibration corrections Glitch monitors were largely quiet »Data was far less glitchy than E7, but documented monitors were ill-suited to characterizing less glitchy data »Need better pre-filtering before glitch-finding

LIGO-G W Raab - Summary of S1 at LHO6 ZGlitch Summary

LIGO-G W Raab - Summary of S1 at LHO7 Importance of On-line Analysis to Monitor Data Quality Apparently no event-rate discontinuity when “heartbeat” turned on

LIGO-G W Raab - Summary of S1 at LHO8 More Operational Issues CDS instability early in run due to GPS timing errors on H1 »Cured by running with doors open (default state prior to S1) and changes to timing configuration Non-linear steering found in H2:ETMx »Appears that there is instability in controller at certain coil currents Alignment swings observed in H1:MMT3 Some correlation of lock loss with single-bldg seismic transients »Local vibration source? Some lock loss correlation between H1 and H2 »EY seismic transient coincident with H1 lock loss »MY seismic transient coincident with H2 lock loss, 6 seconds later »EY transient coincident with turn-on of site water system well pump

LIGO-G W Raab - Summary of S1 at LHO9 Some Good News: Thermal Noise Observed in 1 st Violins on H2, L1 Almost good enough for tracking calibration.

LIGO-G W Raab - Summary of S1 at LHO10 Up Next… New digital controllers for H2 Software upgrades for H1 Install microseism upgrade Need water-system modifications Find the single-bldg vibration source Investigate noise correlations on ISC tables Improve Noise!