The goal of the activity was to measure the induced curvature of the CO2 actuators, as already done in the entry 56708 but in a different ITF condition, starting with the one from W bench the CH power has been chosen to mimic the YAG beam and the DAS ones are chosen to compensate for it. The nominal values, from OSCAR simulations, are reported in the following table:

To have a better knowledge of the ITF initial status, it was locked @ CITF and then a matching scan has been performed.

At 14.47 UTC the ITF was put in WI Single Bounce and at 14.50 UTC an HWS INJ acquisition was started.

At 15.00 UTC the WI CH was switched ON at 0.078 W. When the CH curvature reached the steady state, the WI DAS was switched ON: inner ring at 0.13 W and outer ring at 1.55 W.

The entire behavior of the curvature is shown in figure 1.

At the end of the measurement, a new matching scan has been performed and the ITF was locked @ CITF for 20 minutes.

At 20.13 UTC the ITF was locked on IR and we left the CO2 TCS actuator’s powers in the following condition: