Vicky, Brina,

Looking at coherences in DARM while SQZ was on and off and the PEM acc sensors in SQZT0 (image 1) and SQZT7 (image 2). We noticed the 120 hz noise is a lot more significant in T7 than T0 and we were wondering if this makes sense, since the two chambers are right next to each other. I guess, the question is do we see the 120 Hz jitter noise at the AS port? because this AS port is closest to ham7/SQZT7 & Ham6 since it is connected and that would mean there is some output jitter? and the reason we most likely don't see the noise in SQZT0 is because it is just too far from the others? (or if the source of the like random 120Hz vibrations is just farther from SQZT0 than it is from the AS port HAM chambers)

I am going to plot another set of coherences with the SQZ on/off on another day to see if we can see whether or not this 120 Hz noise goes up/down between the SQZ being on/off, it is not really clear in these first sets of plots I made.

There is also this peak around 770 Hz that is visible when the SQZ is on, and seems to disappear when the SQZ is off, I will work on getting another coherence pot  to see if the 770 Hz is in HAM7 accelerometers if SQZ_OPO_LR is LOCKED vs DOWN. 

Will follow up with Vicky in the comments.