The goal of the shift is to check the centering of the WI CH/DAS on the CP centre identified by the lens induced by the RH, switched on last night (see entry 56330).
At 06.58 UTC I stopped the HWS-INJ acquisition and analysed the wavefronts acquired during the night to evaluate the coordinates of the RH lens: Y=(-3.01 +- 0.05) cm and X=(3.44 +- 0) cm (CP coordinate system).
At 08.20 UTC I started a new HWS-INJ acquisition and at 08.25 UTC WI CH was switched on @ 485 mW. I found the CH to be misaligned with respect to the CP centre (see table below). Thus, I proceeded to move the Hot Mirror on the CO2 WI bench. In this bench, the picomotors work properly.
All the HWS steady state maps are shown in figure 1 and the steps made to align the CH and their results are summarised in the following table.
|
| Y coordinate [cm] | X coordinate [cm] |
| Reference (RH centre) | -3.01 +- 0.05 | 3.44 +- 0 |
| CH at the beginning | -0.63 +- 0.04 | 1.65 +- 0 |
| First movement: TX BACKWARD 11000 steps | ||
| CH after first movement | -2.56 +- 0.05 | 2.12 +- 0.04 |
| Second movement: TY FORWARD 5500 steps | ||
| CH after second movement | -1.98 +- 0.04 | 3.58 +- 0.03 |
| Third movement: TX BACKWARD 4500 steps and TY BACKWARD 2000 steps | ||
| CH after third movement | -3.89 +- 0 | 4.18 +- 0 |
| Fourth movement: TY BACKWARD 3500 steps | ||
| CH after fourth movement | -3.07 +- 0.08 | 2.74 +- 0.07 |
After the last step, the WI-CH is better centred on the WI-RH centre, the differences are Y=(0.06 +- 0.13) cm and X= (0.70 +- 0.07) cm.
At 15.15 UTC I switched off the WI-RH.
I left the TCS powers condition of June 28th (see entry 56314):
| CH [mW] | DAS IN [mW] | DAS OUT [mW] | |
| WI | 120 | 625 | 1510 |
| NI | 160 | 730 | 2570 |
