Vlad, Timesh,

Timesh has asked for a summary of X-End noises, that DetChar suspected arose from NCAL related work there on Tuesday.

I have attached here what DetChar was monitoring in the main glitch monitor, and annotated relevant activty. For relevant correlation analysis on the noise source, one can look at any day between Wednesday (2019-11-13) to Monday this week (2019-11-18), under the DetChar-Hveto tab and look for at the analysis concerning H1:PEM-EX_ADC_0_18_OUT_DQ,

I was informed last week that NCAL had been powered down at some point before Friday. It seems I may have been misinformed and everything had been left on. Timesh should know better than I.

When I went and turned the encoder off (assuming that the rest of the electronics had been off), I asked to leave them turned on to be in the same state as we were in the Tuesday before NCAL was first used: when we didn't see any glitching. This is strange, and I am surprised that there was no glitching before this time if everything had been powered just the same. Possibly something had changed, or something was powered differently before that Tuesday.

As seen by DetChar over the weekend: glitches were fewer and less strong - but still present and correlated to the X-end.

Recently there was an overhaul of electronics in the X-end, especially concerning NCAL, so we'll have to see if that helps.