[Sbs_gems] [EXTERNAL] Re: Cosmic data for INFN J3

[Ezekiel Wertz]

I should also note that I have attached cluster_1092_less.pdf . This was me
rerunning the analysis with about half the files involved, cause it looked
like with the full 1M there was some oversaturation. So
cluster_1092_less.pdf considers probably about 500k-600k events.

Zeke

On Thu, Dec 9, 2021 at 2:45 PM Ezekiel Wertz <ewertz at email.wm.edu> wrote:

> 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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