Koji and Kiwamu had adjusted the MC beam axis slightly such that we can couple the MC output into the Y-arm without exceeding the current range of adjustability on PZT1. This changed the centering of beam spots on MC mirrors. I checked the mc-decentering make sure we have not made too big a compromise. And since we can move MC2 spot position while maintaining the current positions on MC1 and MC3 decentering, we can atleast eliminate the A2L coupling on that mirror. I used the scripts in $scripts$/MC/moveMC2/ to adjust the MC2 spot position.
Spot positions in mm (MC1,2,3 pit MC1,2,3 yaw) before adjustment:
1.4674 -0.3548 1.0199 -1.5519 1.9834 -1.5971
After correcting MC2:
1.4528 0.1431 0.9958 -1.2147 0.3823 -2.0163
After correcting MC1:
1.3745 0.0669 0.8899 -1.5269 0.0296 -1.7314
The spot positions on MC1 and MC3 are very nearly (+/- 0.06 mm) same as before, while the MC2 decentering has been reduced close to zero.
A slight adjustment of the PZTs may be required to reset the beam pointing.