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AdV-INJ (Beam Pointing Control)
gosselin, derossi - 12:30 Tuesday 07 May 2019 (45837) Print this report
Beam pointing control corrections reduction

This morning during the maintenance we reduced the corrections of the BPC loop (plot 1)
To be noted that the corrections are always drifting in the same direction (plot 2) and so is the actuation we are applying on the picomotors.
As a result it seems that the beam starts to be clipped as the reflection from the IMC is suggesting: figure 3 as it was after the last general realignment (19/03/19), figure 4 this morning.
However this does not seem to particularly affect the transmission/reflection of the IMC (figure 5).

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