K. Kawabe, J. Kissel, E. Merilh, C. Vorvick

Hoping not to have a repeat of yesterday's failed attempt at aligning the IFO by hand, we hit the whiteboard this morning to clearly outline our plan after Cheryl and Keita thought hard about what went wrong and what to do over night. Here's the game plan we're going forward with today:

Prep: misalign SRM, put face shield on ITMY

#      Step                            Drive Optic(s)               Alignment Metric
1      Input Align                     PSL PZT & (IM3 or IM4)       PRM and PR2 irises, IR card

2      Check PR3 spot                  (if bad, move PR2)           Target on PR3, camera viewer

3      Check ITMX Spot                 (if bad, move PR3)           Face shield on ITMX, camera viewer
  
4      Retro Reflect back to PRM       Walk PR2 and PR3             Return Beam overlap with forward beam @ PRM Iris, IR card
       For walk, 
       move PR2 opposite of PR3 in Pitch
       move PR2 same as PR3 in Yaw
       For walk, move with a ratio of 9.7 : 1 in PR2 : PR3 step sizes

5      Check ITMX Spot                 (if bad, walk PR2 and PR3)   Alternate between (face shield on ITMX, camera viewer) and (return beam Return Beam overlap with forward beam @ PRM Iris, IR card)

6      Check PR3 Spot                                               Target on PR3, camera viewer

--------- PRM to ITMX is set. Do not touch Input and PR optics ---------

Prep: put face shield on ITMX, keep SRM misaligned

7      Check ITMY Spot                 (if bad, roughly adjust BS)  Face Shield on ITMY

8      Retro Reflect IY back to PRM    Walk ITMY & BS               Return Beam overlap with forward beam @ PRM Iris

--------- PRM to ITMY is set. Do not touch Input, PR, ITMs, or BS optics until Step 11 ---------

Prep: remove ITMX face shield

9      Check SR3 spot                                               Target on SR3, camera viewer

10     Check SR2 spot(s)                                            IR card

11     Fine-tune ITMX and ITMX beam on SRM                              IR card
                                      Walk (ITMY & BS) for differential spot change
                                      Walk (SR2 & SR3) for common spot change / centering
       For walk, move with ratio 5.8 : 1 in SR2 : SR3 step sizes

As we break for lunch, we're mid-way through step 5.

I attach a screenshot of our alignment offsets and OSEM values as we left it. #TouchWood