[Sbs_gems] [EXTERNAL] Re: BB GEM Cosmic Test

[Sean Jeffas]

Hi All,

The APV in question was replaced yesterday and more cosmic data was taken.
The problem seems to be resolved now. All the layers look good. Please see
the last two pages of the attached PDF. The GEMs are fully ready for beam.

Best,
Sean

On Sun, Jan 9, 2022 at 4:44 PM Sean Jeffas <sj9ry at virginia.edu> wrote:

> Hi All,
>
> We have taken a lot of cosmic data since installing the new UV layer in J0
> place. I have attached the results below. These are low level plots with no
> tracking, so there are a lot of weird features you do not need to worry
> about. The most important plots are the hit maps on the last two pages. The
> layer that we swapped is layer 1, and we see that everything is fine for
> that one. Everything looks good except for one APV that is empty on UV
> layer 2. This corresponds to one of the 3-slot backplanes which we have
> just recents attached. The pedestal data looks normal for this APV in
> question, so I was thinking it may be detached from the readout board. I
> already went to the hall and checked that the APV is definitely attached
> correctly, and the issue still persists. My next plan is to swap out the
> APV and we will take more cosmic data.
>
> Best,
> Sean
>
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