Kiwamu, Alexa, Sheila

Tonight we have locked DRMI on 3F +the arms on ALS many times.  We were able to sweep COMM from one side of the resonance to the other, and DRMI stayed locked. 

• We added PRCL subtraction to the SRCL error signals, for 1F we have a -8 in the input matrix, for 3F we have 0.4  For the 1F, this helps DRMI acquire lock faster.
• We have tried slowly decreasing the COMM offset from 500 Hz (in IR).  We have been losing lock between 150-90 Hz offsets, we don't know why.  We werwe in the process of checking for coherence with the arm signals and checking loop gains as we slowly reduced the offset when a 7.2 earthquake hit off Nicaragua. 
• The good news is we have locked DRMI +arms several times and it is stable for many minutes, up to 20.

Times:  DRMI +arms off resonance , on 1F 00:23:54 UTC october 14th 2014.  transitioned to 3F, 00:30:25 UTC

There was one time that we had difficulty locking DIFF, we disabled the LSC DARM offset and this might have helped.