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AdV-PSL (Pre-mode-cleaner block)
gosselin, chaibi, coulon, chiummo, derossi, melo, spinicelli - 12:11 Friday 11 September 2020 (49397) Print this report
PMC loop improvement

Yesterday morning, we worked on the PMC loop.
In particular on the peak at 16 Hz that we could see on the error signal.
This peak was actually coming from the RF generator used to scan the PZT of the PMC. The BNC cable was still plugged to the rampeauto and the generator was on. Even if the gain was set to zero, this was disturbing the ground of the rampeauto. 
We unplugged the cable and the peak disapperead (plot 1).
Now the PMC error signal is similar to what we had in march (plot 2)

We still have to work on the offset of the error signal to get back to a good matching (plot 3)

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