shivaraj.kandhasamy@LIGO.ORG - posted 02:42, Friday 12 April 2024 (77130)
DQ Shift report for the week from 2024-04-01 to 2024-04-07
Below is the summary of the DQ shift for the week from 2024-04-01 to 2024-04-07
- The detector had an average (observing) uptime of 60%. There were also times when the detector was locked and used for commissioning activities.
- The range was typically around 158 Mpc.
- Most of the days, some non-stationary noise was visible in the low-frequency region, specifically in the 10 - 50 Hz band.
- There were a few strong lines in the 20 - 50 Hz region, which seem to come from the bounce and roll modes of the triple suspensions (HSTS, HLTS) (a-log 70778, a-log 49643).
- There were BS violin modes around 300 Hz and their second and third harmonics around 600 and 900 Hz, respectively.
- Some wandering lines around 4640 Hz, 6020 Hz, and 6310 Hz which all seem connected.
- The glitch rates at different Omicron SNRs were mostly consistent throughout the week.
- There were excess glitches around 1300 Hz, causing a bump around SNR ~ 10 in the omicron glitch histogram, which went away after the SQZ ADF was turned off (a-log 76962).
- Most of the strong omicron glitches were centered around specific frequencies such as 32 Hz, 40 Hz, 50 Hz, 280 Hz, 400 Hz, etc.
- For most days of the week, we saw occasional noise bursts around 32 Hz, which was also seen on many of the corner station accelerometers and ground seismic sensors (a-log 77127).
- A few accelerometers had data quality issues, probably either not connected or bad connection (a-log 77009).
- The dominant channels in Hveto were usually H1:PEM-EX_VMON_ETMX_ESDPOWER48_DQ, H1:ASC-X_TR_B_NSUM_OUT_DQ, H1:ASC-AS_A_RF45_Q_YAW_OUT_DQ. The ASC channels showed up on the last few days of the week.
- The rate of PyCBC triggers seemed comparable to previous weeks.
- On April 1st, the scattering page identified many glitches in the 20 - 60 Hz region as due to scattering. Due to the network outage, the scattering pages were unavailable for the last few days of the week. So it is not clear whether this applied to the rest of the week.
- Nonsens cleaning removed some of the features between 100 Hz and 600 Hz, improving the range.
The full DQ shift report with day-by-day details is available at https://wiki.ligo.org/DetChar/DataQuality/DQShiftLHO20240401
Images attached to this report
