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["Visser, Gerard" <gvisser AT indiana.edu>]

hi Zhenyu & Xu,

    I forgot to bring this up in the meeting, sorry. Something I wanted to point out &ask you about. I see on the Jplots a disturbing amount of bad pedestals on occasion, e.g.here

  or here 

   I don't recall that it was like that for IST, (Am I wrong?).

   This looks like some analog problem on the frontend and in that case it is not going to be resolved. But we probably need to at least see how bad it is (what fraction of events are corrupted in such a way, and is it correlated among the bad places or happening independently with some probability on each APV (or group) that shows it?) It seems that most APV's do not show the problem, but there are a lot that do. Maybe there is some offline workaround to use hits during these moments of bad pedestal, I don't know. Maybe even the CMN subtraction "fixes" it although since in many cases it seems to saturate the low end of APV output level that can't always work.

   It's certainly not the highest priority but probably should be investigated.

      Gerard

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From: Star-fst-l <star-fst-l-bounces AT lists.bnl.gov> on behalf of Zhenyu Ye <yezhenyu2003 AT gmail.com>
Sent: Sunday, December 19, 2021 9:08 AM
To: Star-fst L <star-fst-l AT lists.bnl.gov>
Subject: [Star-fst-l] STAR FST Meeting 12/20/2021 9am EST

 

Dear all,

This is a reminder for the FST meeting tomorrow starting at 9am BNL time

Agenda: https://drupal.star.bnl.gov/STAR/event/2021/12/20/STAR-Forward-Silicon-Tracker-Meeting