Followed Naoki's 70642 instructions. Pushed to aligoNB git. There was a small EQ passing through just before I started this. Had ~3dB of constant SQZ.
Last ran and analyzes aligoNB injections with hot and cold OM2 in December 74943 / 74788. We haven't measured coupling of frequency and intensity noise since August 2023: 72140.
Followed Naoki's instructions for running aligoNB 74788. Using data from 1387120622 2023-12-20 15:16 UTC (cold OM2, observing, IFO locked 11.5 hours, 160Mpc) with today's intensity noise injections.
See attached plot, above 300Hz laser intensity noise is a factor of 2 to 5 above August measurement (Laser NB plot from Aug 2023 -alog 72770) but still low. We don't see any contributions in 30-300Hz range.
Wow, not very coherent for a signal appearing that strongly in DARM.
Adding the coherence plots for LF and MF, low freq coherence is only 0.3, maybe th reason we see no intensity noise contrusion 30-300Hz.
We could think about repeating with higher gains, Craig also suggests doing the frequency noise injections (70642) as MF and HF noise can be seen in DARM but coherence is not 1, maybe the coupling mechanism is frequency noise.
