Gabriele, Sheila, Craig, Hang

Today we locked PRMI, realigning PRM after the Y arm alignment last week.  The build ups in PRMI are low compared to 4220  and 42435 POP 18 NORM is around 15 counts, while POP 90 norm is around 24 counts, both about a third of what they should be.  We attempted to walk the alignment to improve the build ups, but  have only gotten small improvements.  We also aligned SR2 to center on AS_C, and locked SRY.  

We went to ISCT6 to align the AS AIR camera.  We aren't sure where the fringes on the AS AIR camera come from.  We tried replacing the camera with an analog camera temporarily, and saw the same behavoir.  We also tried rotating both camera on their side, and the fringes stay in the same orientation.  However when we move the beam on the camera using one of the steering mirrors on ISCT6 we see that the fringe stay in the same location on the camera (they don't move with the beam).  We tried changing alignments of several optics but don't see any impact.  We ended up mounting the camera at an angle which resulted in fewer fringes on the camera.