Beverly, Jess

• For this DQ shift, the duty factor over the 4 days was 33.0% with the range mostly around 75 Mps or so.
• 50 Hz glitches: An unexpected round 2 winner in Hveto was traced to 50 Hz glitches that were shown to be related to ground motion in EX (alog) and later correlated with the turning on of an air compressor located there (alog).
• Range drops: The ETMY "saturations" (apparently due to DAC crossings ( alog)) continue to be present causing range reductions. Possibly interesting is the time series in h(t) and ETMY for a glitch causing a small range drop (see Fig. 1). Throughout this DQ shift, there appeared to be no obvious noise associated with the range drops visible in the h(t) spectrograms in the Summary pages. However, a feature (at the frequencies of the bounce and roll modes) in the h(t) spectrogram for  the lock on 13 Sept was seen to coincide with a range loss (see Fig. 2).
• New lines visible: Lines at about 500 Hz (violin modes) and 2400 Hz (unknown) were seen in the early part of locks on 10 and 11 Sept. The 2400 Hz line did not appear on subsequent days.
• Feature associated with bad alignment: A feature seen in the early parts of locks on 10 and 11 Sept in the range of 300-350 Hz (see Fig. 3) are probably due to lines associated with the PSL Periscope. We consulted Paul Altin who believes that this feature was a precursor to increasing noise due to worsening alignment. This feature did not appear on 12-13 Sept.
• CBC glitching: CBC BBH Omegagrams showed several categories of glitches although this study is still in progress.

The full details for the shift may be found here.