DQ Shift Summary: July 25-26

(See the DQ shift wiki page  for more details.)

There were two long analysis-ready segments in this shift:

Sat Jul 25 22:23:58 to Sun Jul 26 02:23:45 (4 hours)

Sun Jul 26 10:13:36 to Sun Jul 26 23:10:22 (12.9 hours!)

Overall the locks were very clean. Here are the main data quality notes:

• The glitch rate was low and steady!
• The loudest glitches came from the ETMY DAC saturations -- see alog 19937
• Several loud glitches between 100-400 Hz (related to PSL periscope?) occured throughout the locks (a couple per hour)
• Glitches at 60 Hz every ~70-80 minutes, found by hveto to be correlated with the ETMY suspension. (H1:SUS-ETMY_M0_DAMP_L_IN1_DQ)
• Upconversion around the first harmonics of the violin modes is higher than it has been in the past; these nonstationary features have been a problem for the burst search.
• Loud, short-duration low frequency glitches ("blip glitches") are still present. (A few per hour)