This week Chiara, Jenne and I installed a bunch of infrastructure in SEIPROC to allow us to try to reduce low frequency differential motion between chambers by adding differential cps to the error points of different chambers (mostly outlined in Chiara's 52477, similar to work that Seb and Arnaud have done at LLO). We've tried running this a couple times and haven't gotten it to work. Just as an idiot check, this morning I looked at the transfer function between the differential signal and the ISC input to MC2. I'd like a chance to collect a quick driven transfer function to the IMC with HAM3, but I don't think I'll have time today.

First image are the magnitude and phase of the CPS differential (HAM3_SUSINF_X_INMON) to the sus M3 ISC input, looks reasonable, seems fittable. Second plot is the coherence pretty good, not as high as I'd like, but these are just the epics monitors so I don't totally trust it.