Around 08.50 UTC Francesco called me from CR, because the DMS flag of WI_CO2_Laser became red for mean_TCS_WI_CO2_PWROUT value falling down.

First of all, I recovered the WI DAS outer ring power injected inside the interferometer, rotating the corresponding waveplate (action ended around 08.57 UTC)

Then, I try to recover WI CO2 main laser state by acting on its chiller setpoint:

• at 09.00 UTC WI e BCK chiller setpoint changed from 19.03°C to 19.02°C → wrong direction

• 09.05 UTC WI e BCK chiller setpoint changed from 19.02°C to 19.04°C

Once the situation was re-established, I also recovered the  waveplate (action ended at 09.20 UTC).

In Fig. 1 the main signals are reported.