Nic, Evan, Jenne

We tried looking at the efficacy of MICH freeze with DRMI today.   

First, we looked at the MICH fringe velocity in Michelson-only: With the MICH freeze engaged, the fringe velocity seems to slow down by a factor of about 2 versus without the freeze.  

Then we aligned the DRMI and tried to get some locking statistics (length of time waiting for lock) with the freeze on vs. off, but we aren't really getting any locks at all.  We waited more than 15 minutes without a lock with the freeze off, so we went to trying with the freeze engaged.  With MICH freeze engaged, we had 2 wait times of 2 or 3 minutes, but all other times have been more than 15 minutes.  (We tried changing trigger threshold settings a few times, which is what defined the ends of these 15 minute wait stretches).

So far, it's not clear to us whether the MICH freeze is having a significant effect at all.  We think we'll try again later.