Sheila, Camilla, Disha
After Jim locked the ISI, Marc bypassed the high voltage interlock, and Camilla restored the psams, we reset the alignment sliders following 90483 which was in air. The dither locking worked without any issue, and we saw that the beam was low on both the irises in the homodyne path on SQZT7. Camilla adjusted the alignments of ZM4+ZM5 to center the beam on the irses, screenshot attached shows the alignment that she found.
We placed an iris in front of ZM4 for this alignment, we were able to look from the +X side of the chamber to check the centering. We also took photos of the IR/green co-alignment, it looks good coming right off the VIP, but looking right after ZM3 you can see that there is a small misalignment in yaw. We will continue with placing irses tomorow.
This morning we reverted the -710 counts on H1:SYS-MOTION_C_PICO_J_MOTOR_3_X_POSITION (H:M2 yaw), undoing the change that we made in 89596. This seems to have improved the co-alignment, I will attach a photo here to compare to the co-alingment photos from yesterday (90426)
We also lowered the PZT scan range to get the OPO seed dither locking to work well, as it was trying to lock at the top of the PZT range and not staying locked. (line 654 of the OPO guardian).
We attempted to go to the alignment in 89694 to check the alignment of FC1, but we saw that FC1 was not actuating. This is probably why Camilla had to adjust the alignments of ZM4 + ZM5 yesterday. 90426. The CDS team is working on the issue with FC1 alignment.
