This morning Camilla and I started to realign the corner station HWS table to our new SR3 position. After doing some checks on table we went into the control room where we found out that we will be moving SR3 again, so we've deferred this work until we know that SR3 is in a final position. Below are links to procedures, some notes Camilla took, and other commentary to help us when we do this next.
T1700163 - Procedure to align with invac picos, but mostly only M1.
LLOalog59625 - LLO alignment using above procedure
Presentation slides on pico alignment with both M1 & M2
LHOalog62527 - April 2022 LHO alignment with these picos
Notes from today:
ITMX ALS beam was hitting top periscope mirror and missing bottom mirror. ITM ALS was hitting both mirrors but mis-centered on bottom periscope mirror.
Started looking at ITMX camera, removed both plates.
SR3 Yaw, old alignment -150, new alignment 120.
Checking beam on HWS using SR3:
Beam there at -150, Beam gone -190, -170 plateau/edge, -75 plateau/edge
Center between both plateau -120. Checked we could see ITMY HWS beam on camera here.
Went towards optimal SR3, SR3 Y at -60
Pico#7 M2. X more negative. Started at 0, went to -500, where our average pixel values back to plateau/ before clipping on other side.
SR3Y to -40
Pico#7 X —1500
SR3Y to -10
Pico#7 X —3090
Now have hard edge in left side of camera picture.
Moved #8 M1 from 0 to 500 in X. (Realized we meant to be moving M1 the whole time)
Reverted so all picos are 0,0. SR3 Y back to original +120.
Can see some bright spots on the ITMX camera that remain when ITMX is misaligned (screenshot). We should check for on table beams getting to the camera, might need to add beam blocks. Also, seeing multiple point diffraction on the streamed image, this has been dust in the past so it might be a good time to check cleanliness on the optics while we are on table next.
