[Sbs_gems] [EXTERNAL] Cosmic data for INFN J3

[Ezekiel Wertz]

Hi GEM folks,

So recently Holly and I manipulated some readout electronics for INFN J3.
We then took cosmic data. I have attached the results. But I have also
attached an annotated version, describing what I think is going on with all
3 modules. Take note in these plots that Module 0 is the bottom. Module 1
is the middle, and module 2 is the top. Take note in the last plot which
shows the cluster map for the entire layer that the left is the top module
and the right is the bottom module.

Any comments and questions are welcome. Throughout some of this cosmic data
we were varying the latency and we think that a latency of 26 is ideal for
the current Test Lab setup.

cluster_1028: Taken on 11/13/2021. Layer 0 is J1, ignore that for now.
Layer 1 is J3, we will be comparing to this. ~1M events taken. Latency is
20, so not the best.

cluster_1092: Taken on 12/7/2021. Layer 0 is J3. ~1M events taken. Latency
is 26, which is better. Maybe not best.

I have included an annotated version describing what I think is going on.
In reference to that annotated version the only things that don't make
total sense to me are the regions outlined in magenta and turquoise. I
think the region in turquoise is simply an artifact of the location of the
scintillators. I could carefully and slightly move the GEM layers so that
way this portion is more towards the middle and take more cosmics. If it's
a readout problem the answer to that is less clear, as these APVs have not
really been manipulated. Feedback from Evaristo, Nilanga, or Kondo would be
greatly appreciated.

Best,
Zeke
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