I've been looking at some of the locklosses to see if there were any things that looked like thermal drifts. So far I haven't found anything like that. Looking with Sheila, we thought we had found something suspicious on the ETMs, but it's only the HEPI tidal accumulations bleeding off. First attached plot are the ETMX HEPI ISC input (in nm) and the ETMX oplev pit and yaw. While the ISC input is ramping down to zero, the oplev sees an apparent angle change. This is a known issue, so not unexpected. What I think is not know is if the tidal bleed off is causing issues for us when we are relocking. It's been suggested that maybe we should wait for the tidal offsets to go to zero before ISC_LOCK returns to ready. This could mean we are waiting for a couple of extra minutes before we start trying to lock the arms.

Unfortunately, I don't think we can push the HEPI bleed off any faster. Looking at the T240 counts on the ETM ISIs, both get up to 20000, or over, counts, out of 32000 allowed. We haven't had any problems with ISI trips, but if we try to speed the hepi reset up, we could start tripping ISIs on lockloss.