DQ shifters: Riley McNeil and Emil Lofquist-Fabris
Daily observing duty cycle: 57.05%, 67.36%. 99.68%, 59.91%, 91:23%, 69.16%, 100.00%. Week average: 77.77%.
The BNS range this week sat around 150 Mpc, however there were a few sudden drops in the range by about 5-10 Mpc. These were seen on Tuesday, Thursday, and Friday.
There were several issues with the squeezer this week that resulted in sudden increases in noise and glitching, as well as a couple drops from observing.
There was a recurring spike in the y-manifold beam tube motion [X] at 17:00 every day. This was seen in the previous week as well, this is caused by the daily dewar fill noise at the Y-manifold cryopump. (alog)
There was also recurring noise from ~11:00-14:00 in several corner station accelerometers also seen in previous shifts.
Just above 20 Hz (~22-25 Hz) there has been a line of glitching that we believe to be light scattering. This has been seen since at least the start of July 2025.
There has also been a lot of glitching/noise from ~20-40 Hz, consistent with previous weeks, likely from an AC unit housed inside the VPW. (alog)
There was a 34 hour lock segment this week, from Tuesday August 5th 22:19 to August 7th 08:31.
The detector also spent all of Sunday observing as well.
See full report here: https://wiki.ligo.org/DetChar/DataQuality/DQShiftLHO20250804