Evan, Sheila

We lost lock a few minutes ago (24093) due to a 36 mph wind gust at EY. We are running 45mHz blends on all BSC ISIs now, and microseism is around 0.8um/sec.  The first plot shows the wind gust that we think knocked us out.  

We then ran both of our saturation lockloss scripts.  The second attached plot shows that a saturation of ETMY L1 by a 50mHz signal was the proximal cause of lockloss, which must be from the length drive since this is our only dirve signal sent to ETMY.  

Since we can't offload to HEPI above the blend frequency, it seems that we would need length feedback offloaded to M0 to avoid this kind of lockloss in the future.  

Many ASC signals also see a large excursion around the time of the lockloss.