This morning Elli and I spent some time on phaseing of AS WFS, and again this evening we picked it up again.  More details to follow, but here are some highlights:

We can use a consistent phase on all 4 quadrants to get reasonable signals.  

In PRMI we can use 40 degrees for all quadrants on ASA36 to get most of the static signal into the I phase, and 90 degrees on AS 36 B.  In this situation the Q phase has a good signal for the BS, with the transfer function from BS pit drive (1000 cnts, 12 Hz) to each quadrant having all the right phase relationships.  

In DRMI 90 degrees still seems like a good setting for keeping the static signals in the I phase for AS B, while AS A it seems like 20 degrees is a better phase, except for quadrant 4 where it seemed like the phase should be 70.  I assume that this could be caused by a misalingment, and should not be a real since all the phases were consistent in PRMI.  

We closed the loops on AS B in DRMI, which worked fine, and locked.  The phases of the transfer function to each quadrant stayed consistent in DRMI, full lock, and at 10 Watts.  I left the excitation on the BS as I powered up, starting around 7:08 UTC sept 10th.  Durring this time all the quadrants on AS 36 A had an R phase of 20 degrees, all the R phases for AS B 36 were 90, and the yaw matrix for both wfs was normal (it included all quadrants.)  After powering up to 10 Watts we saw the usual runaway where POP90 grows.  We can perhaps look at this data to see if our sensing matrix was changing durring some thermal process. 

After several minutes at 10 Watts, I tried to recover a good operating point by moving the offset in AS_C, which did not work and broke the lock.  

Everything is reverted and we are going back to locking with our old arangement for AS WFS.