[Kar Meng, Sheila, Eric]

We spent some more time today getting HAM 7 squared away after the VOPO swap.  This morning, we plugged in the new oven stage controller and tested out the new translation stage and cabling.  Everything worked as expected.  After we were done testing, Sheila moved the new controller to the SQZ cabinet for storage.

This afternoon we continued work with recovering alignment on the 1064 path in transmission of the VOPO.  Yesterday, we managed to roughly align everything in the chamber except for the iris before ZM4.  However, we ended up walking FC1 a bit to get the retroreflected beam from the filter cavity back through SFI1.  Today we started to slowly step FC1 back to its original position recorded in (88602) while walking the two steering mirrors on the VIP between the VOPO output and SFI1 to compensate.  We managed to get back to our original pitch position and about halfway back to our original yaw value while still keeping the beam roughly aligned through all aperatures up to the edge of the VIP.  However, we found that the beam coming off the VIP was still not aligned properly through the Iris in front of ZM4.  In fact, it had moved further in the -Y direction and is now clipping on the black glass beam dump for the FC1 wedge.  We were a bit disappointed at this point to find that we weren't making progress recovering the original SQZ path alignment.  

We then decided to turn on the FC 532 field to see if the 532 and 1064 FC paths were reasonably well co-aligned.  We were hoping that the 532 field might provide us with an additional alignment reference since, in principle, it should still be properly co-aligned with the transmitted 1064 field from the old VOPO.  However, we discovered that the FC green field was not well aligned to the iris we'd placed after ZM3.  It was about a quarter inch too low on this iris. Also, along the beam path right after the VIP, the 1064 and 532 fields are off from one another in both the horizontal and vertical directions.  Unfortunately, we did not think to double check the 532/1064 co-alignment carefully when we were setting up the irises using the transmitted seed beam from the old VOPO, so we're unsure of exactly what happened here.  A few thoughts:

• We didn't have time to look at the FC green retroreflection today.  If the retro beam is misaligned, that would confirm that the issue is with the FC green path rather than with our 1064 nm alignment reference. 
• Its possible that this path got bumped when we were swapping out the new cable for the VOPO translation stage.  That path was very much in the way of our arms when we were reaching back to the cable bracket on the ISI.  We should secure the new cable sooner rather than later to avoid bumping the path after realignment is complete.  
• We should check if the FC Green fiber collimator is secure.  We had to tighten down the CLF collimator mount yesterday when we discovered that it was loose.