Attached are pitch/yaw spectra for the currently active SUS optical levers (ITMx/y, ETMx/y, PR3, SR3, BS), taken during a quiet lock stretch from yesterday @ 15:00 UTC (08:00 PDT). Based on these spectra, everything looks healthy. As an additional check (especially considering Sheila's report of BS oplev glitching here), I looked at the oplev SUM spectrograms posted on the DetChar summary pages. Looking at these (both the normal ASD spectrogram and the normalised ASD spectrogram) it can be seen that the BS (here) and ETMx (here) oplev lasers are showing signs of glitching (the broadband lines indicate this). After talking with Sheila, since BS oplev damping is only used in DRMI lock acquisition and then turned off, there is no rush to replace the BS oplev laser. We might save a little time in DRMI acquisition, but it so far is not a detriment to IFO operation (this is good as I cannot guarantee the spare laser I currently have will perform any better; I'm still waiting on a shipment of repaired lasers from the manufacturer that will alleviate this). ETMx oplev damping is not used at all, so also no rush to replace. The current SUS oplev laser replacment priority list is thus:
