DQ Shifter: SangHoon Email: sanghoon.oh@ligo.org

Fellows: Phil Jones and Dripta Bhattacharjee Summary

Summary (highlights) of the DQ Shift: 

• Overall duty cycle was 88.17%.
• Most of the time the range kept stable above 115Mpc.
• Occasional range drops occurred because of wind (Monday and Saturday), and squeezer problem (Tuesday and Thursday). (alog 55281)
• High SNR (>20) glitches were clustered at ~12Hz and between 200-400Hz, 4-6h on Monday and 2-4h and ~15h on Saturday. In consequence, glitch rates were elevated on these periods.
• LSC-MICH_IN1_DQ (Monday) and ASC-DHARD_Y_OUT_DQ (Saturday) channel vetoed efficiently low frequency glitches out of these.
• Violin mode at ~500Hz rang at the beginnings of most of lock stretches. (e.g., link)
• Three short duration (~7min-long) noise excesses appeared at ~32Hz on Wednesday. Presumably related to the on/off of the air compressor. (alog 53271).
• Daily PSD on Wednesday is higher than the cumulative PSD above ~30Hz on Wednesday. (Ratio and each PSDs)
• 48 hour-long stable and continuous observing mode from Saturday to Sunday.

Full report: https://wiki.ligo.org/DetChar/DataQuality/DQShiftLHO20200224