Given the results of the measurement performed in the morning (64834), it has been decided to perform another measurement with HWS-INJ to evaluate the position of the YAG on the HWS map. [Thanks to Diego for preparing the automation nodes for the gentle unlock.]
The ITF locked at CARM NULL 1F at 13.50 UTC and we waited 1 hr for the ITF to warm up. The image of HWS illumination before running the measurement is shown in fig. 1.
The HWS-INJ measurement has been lunched at 15.03 UTC, than, the ITF has been unlocked in the 'gentle' way (WE, NI and NE misaligned / PR, SR, WI aligned/ CH off after the unlock) at 15.20 UTC .
The measurement has been interrupted at 16.20 UTC.
Three different images of the DAS OUT, CH and YAG OPL are shown in fig. 2.
The barycenter coordinates of the YAG and the CH induced-OPL are reported in the table below:
Row [pixels] [Y] | Col [pixels] [X] | |
YAG | Bary: (429+/-17) | Bary: (570+/-30) |
CH | Bary: (322 +/-5) | Bary: (578 +/- 12) |
Thus:
-CH and YAG are well aligned in horizontal direction
-CH and YAG are misaligned in the vertical direction by [1.2+0.5] cm
-for the DAS outer ring, this type of analysis would be fake due to the fact that we are near the edge of the HWS map.
Surely, the misalignment between DAS OUT and CH (or YAG) is stronger in the horizontal direction.
Thus, in agreement with Diego, in order to compensate for this misalignment, we moved BS_REC by 1cm (5556 steps) + 0.5 cm (2778 steps) in TY forward.
Andrea went to the TCS room to switch ON the picomotors on the WI bench. We followed the ring movement looking at the thermal camera and the black paper of the diagnostic system (see fig.3).
The operation has been completed at 16.58 UTC.
We left all the CO2 actuators in the 'run configuration'.
The WI picomotors have been left switched ON.