Reports until 09:08, Tuesday 28 October 2025
H1 PSL
jason.oberling@LIGO.ORG - posted 09:08, Tuesday 28 October 2025 (87786)
PSL FSS RefCav Remote Beam Alignment Tweak

This morning I tweaked the beam alignment into the RefCav from the Control Room using our picomotor mounts; the ISS was ON for this tweak, and the IMC was unlocked.  When I started the RefCav TPD was 0.514 V, and at completion the TPD is 0.535 V.  With the IMC relocked the RefCav TPD is reading 0.531 V.  Not much of an increase, and not as high as the last time we tweaked the alignment on the PSL table.  Everything seems OK for now, but things are moving towards an on-table alignment in the future (since I couldn't get the TPD back to where it was at last on-table alignment with beam alignment alone).  Will continue to monitor.