I took a look at the locklosses during the calibration measurements the past week. Looking at DARM right before the locklosses, both times a large feature grows around ~42 Hz right before the lockloss. Sat LL Thur LL
Thursday:
DARM_IN was dominated by the 42 Hz long oscillation and a ~505 short oscillation until the LL, DARM_OUT was dominated by the harmonic of the violins ~1020 Hz.
Saturday:
DARM_IN had a long and a short oscillation, the fund violin modes, ~510 Hz and ~7.5 Hz, DARM_OUT was dominated by the harmonic of the violins ~1020 Hz
I'm not sure how to/where to see exactly what frequencies the simulines were injecting during and before the lockloss.
Looking into what's going awry.
I pushed for a change of calibration sweep amplitudes on the Pcal and the PUM (which had been tested a couple of month's back) which was instilled into the calibration sweep wiki last week, labeled informatively as "settings_h1_20241005_lowerPcal_higherPUM.ini".
Both of these sweeps were very near the end, where Pcal is driving at 7.68 Hz and PUM is driving at either 42.45 Hz or 43.6 Hz, which should clarifiy the source of the signals you are pointing out in this aLog.
The driving amplitude of the Pcal at 7.68 is about 20% lower than the injections that were being run the week before, deliberately done to reduce kicking the Pcal during ramping to reduce broad band coupling into DARM which would affect other measurement frequencies like the L1 which is driving at ~12 Hz at this time.
The driving amplitude of the PUM at ~42 Hz is unchanged from injections that had been running up until last week.
Not seeing any SUS stage saturating at lock losses. Presently unconvinced lock losses are related to new sweep parameters.
Both locklosses coincided with the ramping ON of the final DARM1_EXC at 1200 Hz
Tagging CAL properly