Reports until 10:00, Tuesday 02 December 2025
H1 PSL
jason.oberling@LIGO.ORG - posted 10:00, Tuesday 02 December 2025 (88309)
PSL FSS RefCav Remote Beam Alignment Tweak

The RefCav reflected spot looked off this morning and the trends Ryan posted yesterday showed a large drop in RefCav TPD, so I tweaked the beam alignment into the RefCav from the Control Room; this was done with the ISS ON and the IMC unlocked.  When I started the TPD was ~0.473 V, and when I finished the TPD is ~0.518 V.  This isn't as high as we have been (~0.55 V), so this is an indication of another misalignment on the PSL table (most likely the double-pass AOM, which is our usual culprit for on-table alignment work).  We're not too far down right now and we are not consistently observing, so we will continue to monitor as usual and will do an on-table alignment should the TPD continue to drop.