Stefan, Sheila

We burt restored ETMX and ETMY sus models to december 3rd at 19:00 UTC.  The difficulties with DIFF yesterday were caused by wrong filter settings probably due to a bad burt after the model restarts.  We then had no problem locking ALS both DIFF and COMM, with the green WFS and tidal feedback on.  The guardian is not yet controlling the tidal feedback correctly once ALS COMM and DIFF are locked.  We need to think about how to get the common signal (from MC-L) to the tidal servo, possibly adding it in the front end.  

Once we turned of the sensor correction DRMI locked well.  We saw that the AS 36 signals were saturated so we changed the whitening gain (1 stage of whitening filters, gain of 30dB).  We spent some time trying to close some loops on the SRC, we closed both AS_A 36I-> SRM in pitch and yaw.  We were not convinced that either loop really works; when we misaling SRM, the error signal doesn't change much before we start mode hopping and the error signal becomes unusable.   We also closed the AS_C -> SR2 pitch loop, while it did bring the beam to the center the SRM loops had truoble keeping up.  We think the next step is to try using SRY and set the output matrix to a combination of SRM and SR2.