Since the drum headmode resonance was found (klog32584), I started the phasing of beacon signals.
Since PRFPMI_RF_LOCKED state was not stable due to huge microseismic motion, I cannot finish the work today (QPD1 measurement was finished but QPD2 was not).
Measured data was stored at /users/Commissioning/data/OMC/2025/0205/.
I measured the spectrum of RF17I/Q signals of OMC REFL QPDs for phasing again because I forgot to engage QPD centering loop in previous measurement.
Attached files show the spectra, coherence, and TF of each segment.
For all sengements, Q-phase signals are less than 0.1 of I-phase signals, which means signal loss due to phasing is less than 1%.
So, current RF17 phasing of OMC REFL QPDs seems fine.
