Last night there were some lock perturbations due to the loop oscillation at about 30 kHz (see plot 1).
In order to attenuate this phenomenon, we reduced the gain of the PZT inside rampeauto till the annihilation of the peak (see plot 2 and zoom plot 3).
To be noticed that there is little margin between keeping the lock and the peak exctinction.
We will let it in that state for the weekend.