Jenne, Hang, Sheila, Rob,

durring the day today we worked on RF centering a bit more.  No real breakthroughs, but there are a few things to note:

• We turned the gain on DC3P back to 0.17, because the lowered gain from last night was too low (ugf below 0.1 Hz)   There is more than 20 degrees of phase margin as long as ELF20 is off. 
• We noticed that the DHARD actutation was turned off to the PUM on the ITMs until we reached full lock,  (the guardian has been this was all along) this is now turned on at the same time as the ETMs when we first engage DHARD.  
• We are able to switch from DC centering to RF centering in full lock.  We did this with only the DHARD loops closed, and saw that the lock point of DHARD does not change when we change centering, and none of the other ASC sensors see much change either. 
• We left the guardian set up to lock with DC centering.

The lock point of the MICH loop is not necessarily good when we are locked with RF centering.  The problem could be that we have the SRC uncontrolled when we are using RF centering, and currently the phasing of AS36 is set to maximize BS in Q, not to minimize SRM in Q which is what we probably want.  Or it could be that we need to check the gain matching on the quadrants for the 90 MHz centering.