This afternoon, we checked the alignment working point of the SNEB and SWEB benches while the arms were locked on the infrared beam.
We found that the optimal angular positions to have the B7/B8 beams well centered on the photodiodes are the following:
- SWEB: TX = +144 urad, TY = +1778.5 urad
- SNEB: TX = -575 urad, TY = -131 urad
As shown in the attached figure, the power on the B8 photodiode was significantly improved with these angular setpoints.
However after this check we restored the old setpoints of the bench which correspond to a better alignment of the green beams.
