The first plot shows the input mirror temperature variations during the last days before the commissioning break and this night.
The small TCS adjustment we did on October 2nd (Adjustment of finesse asymmetry) can be used to calibrate TCS power vs mirror temperature. One gets for both input mirrors 1.3 K / W.
I use data from this night lock to fit the mirror heating using the already known time constant of 5.6 hours (see a href="https://logbook.virgo-gw.eu/virgo/?r=23902" class="urlcopy" target="_parent" >Mirror temperature time constant). In this way I could extrapolate the steady state temperature than would have reached maintaing this night TCS powers. See second plot.
The new temperatures were a bit too low, corresponding to 200mW missing power on NI and 400mW missing on WI. This corresponds exactly to the adjustments performed this morning to bring the power-meter reading back to the old values. This confirms the correct cross-calibration of power meters before and after the commissioning break.
