I started to look into a faster ASC UIM to TOP stage offloading.

The DC gain ratio of the DRIVEALIGN filter outputs is about PUM:TOP = 23:20000 (pitch) and 30:20000 (yaw). There is a slight mismatch between the optics, but that seems to be taken care of with the CAL filter (FM1 in M0_LOCK).

With that gain ratio, and with FM1, FM4 and FM5 on in the MO_LOCK banks, the current x-over between TOP and PUM is about 0.002Hz (pitch) and 0.0029Hz (yaw).

This is very low. I verified that with 10x the gain in all 4 soft loops (gain=0.45 instead of 0.045) and 10x the offloading gain to top, the soop[s still seem stable. I believe the reason we are not running with that during the angaging these loops tax the SRC loops.

I added 0Hz:0.1Hz AC couplers into the L2 DRIVEALIGN P2P and Y2Y banks, as well as 0.002Hz:0.1Hz lead filters into Mo DRIVEALIGN P2P  banks ( 0.0029Hz:0.1Hz lead filters for Y2Y). These filters were successfully engaged in full lock. Somewhere however the guardian turns up the offloading gain by 10dB, making these filters unstable... So for now they are not in guardian.

Unfortunately, the pwer-up is still failing randomly. Not sure whether that's the 40mph wind, the numerous locked-down hepi's or the increased noise on RF DARM.