DQ Shifter: Yanyan Zheng

LHO fellow: Sundae

Mentor:       Beverly

• The duty factor was 60.2% observing at a BNS range of around 110 Mpc.
  • On Wednesday, in the H1 lock segments plot, when low noise was red after 13:00UTC, the observing intent was green.
• Glitches:
  • Violin modes at frequency 500Hz and 1000Hz were visible during all the observations.
  • On Friday, from 5:47-9:00UTC, there was excess noise at 20Hz. The reason might be the attempt to increase power at Hanford. At the same time, the excess noise appeared with the frequency from 25 to 30 HZ,It might be caused by the angular to length coupling. High frequency noise(reaching 5000Hz) appeared during the observing time. This noise might come from the PSL.
  • On Saturday, there was noise with frequency from 20-250Hz at 19:20 UTC. It was caused by a nearby earthquake.
  • On Sunday, there was noise with frequency from 20-40Hz at 2:00-2:30, 15:40-16:00. It appeared to be caused by an earthquake.
• Calibration lines: The Pcal lines are similar to the ones seen last week (5th-12th May). The PCALX lines looked good while the PCALY lines seemed bad as usual.
• For Hveto, the 1st round winners were always H1:LSC-POP_A_LF_OUT_DQ, except Wednesday and Thursday.
  • On Wednesday, The 1st round winner was ASC-Y_TR_A_NSUM_OUT_DQ while the channel H1:LSC-POP_A_LF_OUT_DQ was the winner of round 4. However,In the first 8 hours, the 1st round winner was H1:LSC-X_TIDAL_OUT_DQ. From Slack, the TIDAL channel was found recently to be “unsafe”.
  • On Thursday, the 1st round winner was H1:LSC-REFL_A_LF_OUT_DQ . The 2nd round winner was H1:LSC-POP_A_LF_OUT_DQ.
  • On Saturday, the winner of round 5 was H1:IMC-L_OUT_DQ. In omega scans, the other IMC channels look as usual(show the usual whistles and low frequency blips). But the IMC-L_OUT_DQ channel seemed unususal.
• Lasso: On Sunday,There was a dip at 15:00 in the Lasso model of range. The top three channel were related to ETMY. The negative lasso correction of these channels indicates that they are noiser  when the range is lower as expected for actual correlations.

For the more complete results see https://wiki.ligo.org/DetChar/DataQuality/DQShiftLHO20190513