Reports until 08:37, Tuesday 07 November 2023
H1 PSL
jason.oberling@LIGO.ORG - posted 08:37, Tuesday 07 November 2023 (74046)
PSL FSS RefCav Remote Alignment Tweak

This morning I remotely tweaked the beam alignment into the FSS RefCav using the 2 picomotor-controlled mounts in the FSS beam path.  In looking at the reflected spot on the PSL quad display it was obvious the alignment had shifted since Jenne's tweak last Tuesday, but the TPD had increased from ~0.81 V to ~0.86 V, indicating the the beam alignment was getting closer to where it was the last time I adjusted it on the table; this is also an indication that I could likely get more TPD with another alignment tweak.  With the IMC OFFLINE I started with a TPD of ~0.86 V, and when I ended the TPD was ~0.91 V.  For future reference, I had to walk the beam in mostly the vertical direction, but some horizontal as well; I moved up/left on mirror M23 (1st picomotor-controlled mount, RefCav A on the picomotor MEDM) and down/right on mirror M47 (the top RefCav periscope mirror and 2nd picomotor-controlled mount, RefCav B on the picomotor MEDM).  With the IMC back ONLINE, the FSS RefCav TPD is ~0.89 V.