Samantha Callos, Genevieve Connolly, Robert S.

The 24-36 Hz region of DARM has a high density of vibration peaks, possibly coupling through the HAM1 to CHARD to DARM path. The plot shows several periods over the run, including the April-high sensitivity period that is also used on the DARM figure of merit.  Over the past summer Genevieve, Sam and I have identified several of these peaks (identifications to come) and they tend to be pumps, fans, and other typical motor-driven sources. The coupling of most of the peaks seems a little higher at the end of last week than over other periods in the run, though the 30th was considerably better than the 29th.