I've been trying to find out if DARM is adversely affected by the CPS differential controls. I can't find anything obviously bad so far. Attached image shows, top to bottom, ASDs of LSC-DARM OUT, the EY ground super-sensor (gnd STS - BRS) and BRSY. "Full" is with the FULL_DIFF_CPS, "Corner" is with the CORNER_DIFF_CPS, "Full before R0" is the FULL_DIFF_CPS before the R0 tracking and Sept 2019 is from before the October vent work, before we added the cps differential controls.

Maybe hard to see, but red and blue (full cps diff vs corner only) don't show any real differences, even though the ground inputs were roughly the same. The gold and dashed lines had more wind (especially gold, the BRS shows elevated motion up to 1 hz) and the microseisms at these times were a bit different. The gold trace also shows darm is worse ~.1-.5hz =, which could be due to an earlier CPS diff filter or an older configuration for CPS diff in the corner (the ITMs used to follow the BS, now that's been reversed), not sure when I changed that filter for the BSCs.

I think the take-away is: because the R0 tracking has improved the scattering, we can run FULL_CPS_DIFF all the time, DARM doesn't seem to be negatively impacted. We don't see improvement either, but I think my post from Jan 6  shows we are more robust with it running. Again, I'd like some high microseism to compare, but it's hard to schedule.