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Reports until 14:30, Thursday 18 June 2026
H1 SQZ
camilla.compton@LIGO.ORG - posted 14:30, Thursday 18 June 2026 (90658)
HAM7 Vent Wednesday 17th June. Red-Green Co-alignment fixed, Happy with QPD centering
Ryan S, Camilla
 
QPD Alignment and reflections checked
We were not happy with the location of the beam on D:L1 (towards +X) so we iterated the alignment of D:M1 and D:M2 to better center this (picos and by hand). Then touched D:BS1 and B:M3 to center on QPDs (SEED power reduced 1.4mW to check centering). We then increased power (75mW SEED) and checked the refected beams off the QPDs got to the beam dumps. 
 
ZM4,ZM5 for SQZT7 irises
As we moved A:M3 and ZM3 pointing after the OPO SUS was unlocked, we touched ZM4 and ZM5 alignment to bring the beam back centered to SQZT7 irises, sliders attached.
 
Fixed Red-Green Co-alignment 
We inially though either H:M1 and H:M2 might have got bumped but couldn't recover alignment with just one mirror. We then realized that Begum and I moved the red alignment with A:M1 and A:M2 in 90528 so we'd expect the co-alignment to be different. We then moved H:M1 for centering on the ZM1 iris and H:M2 for the ZM3 iris until we were happy with co-alignment, all moves were with picos only. Once finished, we couldn't not see the retro-refected FC beam so expect it's well retroreflected. Photo and movie attached. 
We could see a green beam on SQZT7 but it was missing the LPM, can verify this FC REFL and check centering later. 
 
Addtioanlly, now the OPO SUS is unlocked, the SK path is back to where it was prep vet on SQZT7 (clipping but on the LPM), photos attached
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