Anamaria, Robert

The plot shows that several peaks are more visible in DARM after the power increase. Most obvious are 483 Hz (turning mirror before rotation stage – was damped), 820 Hz (possibly the optic right after the PMC – hasn’t been damped yet), and two un-identified peaks that had become visible after the recent sensitivity improvements, and that increased in amplitude with the power increase, at about 59 and 70 Hz. We will start looking for the sources of these latter peaks.