To help characterize the recent issues we've seen with IFO alignment that are familiar to the output change in late April, I moved SR3 in 10W single-bounce configuration with the SRC2 ASC loop on so that SR2 would follow (ALIGN_IFO's SR2_ALIGN state), much like in alog77694. I moved SR3 far enough in each direction (+/- pitch and yaw) to bring the ASC-AS_C_NSUM signal back up to our target value of 0.022, which I was successful doing in every direction except -Y, where I could only bring AS_C up to 0.018. In the three directions where I was successful, the beam spot on the AS AIR camera looked much more like the clear circle we're used to seeing and less like the upside-down apostrophe we have now.

It seems that our old output spot (starting place in TJ's alog) is still bad (-Y direction with SR3 from current place) since that was the only direction where I couldn't get the AS_C power back up.

Slider values of SR3 after each move:

Attachment 1 is the starting AS AIR camera image (and our current spot), attachment 2 is after the +P move, attachment 3 is after the -P move, and attachment 4 is after the +Y move.