Reports until 16:50, Thursday 25 June 2026
H1 SUS (SUS)
ibrahim.abouelfettouh@LIGO.ORG - posted 16:50, Thursday 25 June 2026 (90762)
BBSS M2 BOSEMs Centered, M3 AOSEMs Centered, M3 Low Count AOSEM Replaced

Ibrahim, Oli

Today we re-centered M2 BOSEMs and M3 AOSEMs following BBSS alignment work.

These were centered with OpticAlign Offsets of P = 107, Y = 441. These are thought to be a "good" alignment.

We also replaced AOSEM 771, which had bad counts (14k OLG) with AOSEM 770 (high counts at 25.5k - at open light 22.2k - the OLG would change in-chamber depending on whether it's backed out or in my hand).

Then, we also re-attached the LL AOSEM - see picture of cabling - we will likely redo all cabling.

Images attached to this report