(Borja)

We have finally manage to solve the mistery regarding the unresponsive LL quadrant of the ETMY ESD (see this and this). So from now on we can add the 4 quadrants in our measurements.

Another measurement was take today (before seeing the effect of green light on the charging of the ETMY) to see repeatibility of measurements or stationarity of the charge.

I attach here the document including the new measurements as well as a comparison plot with the results of Veff and slopes between the data taken 2 days ago (this is 3 days after the 2nd discharge run) and the data taken here.

A summary table is given next with the current values in green (for each quadrant), and we compare them with the measurements before the discharge runs (in blue) and the measurements taken 2 days ago after discharge run2 (in red):

Conclusions: During the last two days the charge of all quadrants has changed considerably bringing it back for some quadrants to same level (or worse) than before the ionized gas discharge runs took place. Look particularly to quadrant UR in pitch where we manage to do a full discharge after the 2nd discharge run but the current measurement shows again a high charge. The only think related to the ESD that has been done today before the measurements is solving the issue with LL quadrant which required turning off the ESD drive and also moving around some cables at the ESD BIAS low pass filter box. In principle this should not have caused a change in the ETMY charge.