laura.nuttall@LIGO.ORG - posted 19:44, Thursday 17 September 2015 (21639)
DQ Shift: Monday 14 Sept 00:00 UTC - Wednesday 16 Sept 23:59 UTC
The entire DQ shift can be found on the detchar wiki, but here are the highlights (all DQ flags are described on the detchar wiki):
- Duty Cycle 58.5% (after CAT 1 flags this drops to 42.3%)
-
Most lock losses due to earthquakes, nice stable interferometers
- RF45 AM stabilization issues on 14th caused the range to die from ~22:22 UTC. Made a flag for this time (recommend CAT 1 veto).
- Hardware failure at the EY Beckhoff chassis on 15th caused 10 hours of rubbish data. This was fixed and reinstalled. Made a flag for this time (recommend to CAT1 veto)
- Known issues: ETMY saturations are on going, 50 Hz EX glitches due to an air compressor (perhaps), the 60Hz EY magnetometer glitches, low SNR glitches between 300-400Hz (periscope?)
- Magnetic noise at EY and LVEA area seen throughout shift - doesn't seem to couple to DARM. Vinny/Jordan (lho-fellows) looking in to it
- Range seems to slowly vary over long locks. Doesn't seem to correspond to environmental. Perhaps alignment drifts? Elli (lho-fellow) looking in to it
- PCAL excitation channel seems to be glitching every second throughout shift (and before). Doesn't seem to be coupling to DARM and has been happening for quite some time.