Naoki, Wen, Camilla
Today Jim turned on the HAM7 ISI and we checked the alignment of the FCGS and IR OPO Trans alignment to the irises Sheila and I set in alog 65164, I was surprised that neither beams were well aligned with the Zms in the iris settings (30 Sept) alignment.
The FCGS beam on was too high and clipping on the lower periscope mirror, images on LPM and 1st iris attached. The IR OPO Trans beam couldn't be seen.
When we changed ZM3 (not a long term solution, was changed back) to the alignment Naoki found in alog 65334, we could see the OPO trans beam (it was a little low on the camera) and the green FCGS beam became very well aligned.
Jim helped show me that this amount of mis-alignment can't be accounted for from the HAM7 ISI, locationmon's (units nm and nrad) attached. Largest changes bettween Sept 30th and today are 38um in Z and 20urad in RZ, both very very small. I estimate we are seeing a change of the FCGS of 5mm over 3m which is 1.5mrad.
The flipper cable can easily block the FCGS beam before fiber. I'll make sure to fix it when LVEA is globally laser hazard.
We are most concerned with a L or P movement as our FCGS beam seems to have risen ~5mm.