[Sbs_gems] [EXTERNAL] Fwd: Cosmic data for UV Layer and J1

[Sean Jeffas]

Hi Kondo,

The UV layer does not have a mapping problem. It is an exact copy of the
mapping from BB, which is proven to be correct. I believe the pattern and
all the hits outside the active area are just noisy strips that cause bad
2D correlations, since this is a low level analysis and does not have
tracking to check that hits are true. Also notably, I just realized this is
an old version that accepts 1 strip clusters, which certainly also
contributes a lot to the noise that we see. It may be worth it to rerun
with 2 hit minimum clusters.

For the UV data, I see there are some strips missing, and an entire APV on
the right most side. I looked at the GEM yesterday and did not see anything
disconnected, and also the raw APV data did not show me that the APV was
bad. So I am not sure if it is possible to fix all these missing strips. If
we have time I can try replacing some APVs, but it will likely end up being
more work than it is worth. Also I will note that the large missing area
from one APV on the right side correspond to the top of the GEM, and would
therefore be outside of the production cross section anyway.

Best,
Sean

On Fri, Nov 5, 2021 at 1:26 PM Gnanvo, Kondo (kg6cq) <kg6cq at virginia.edu>
wrote:

> Hi Zeke,
>
> I don’t think it is a big deal. Sean or John will probably fix it quickly
>
> Thanks
>
> Kondo
>
>
>
> *From:* Ezekiel Wertz <ewertz at email.wm.edu>
> *Sent:* Friday, November 5, 2021 1:24 PM
> *To:* Gnanvo, Kondo (kg6cq) <kg6cq at virginia.edu>
> *Cc:* sbs_gems at jlab.org
> *Subject:* Re: [Sbs_gems] [EXTERNAL] Fwd: Cosmic data for UV Layer and J1
>
>
>
> Hi Kondo,
>
>
>
> I am not as familiar with the UV layer mapping. So I'll talk to Sean about
> this. I'll also do some comparison with the BB UV layer mappings.
>
>
>
> Zeke
>
>
>
> On Fri, Nov 5, 2021 at 1:19 PM Gnanvo, Kondo (kg6cq) <kg6cq at virginia.edu>
> wrote:
>
> Hi Zeke,
>
> That is great. Thanks for these first results.
>
> It looks to me that there is a mapping problem with the UV layer.
>
> Please have a look at the pattern of the 2D hit map. Just a minor issue
>
>
>
> Best regards
>
> Kondo
>
>
>
> *From:* Sbs_gems <sbs_gems-bounces at jlab.org> *On Behalf Of *Ezekiel Wertz
> *Sent:* Friday, November 5, 2021 1:11 PM
> *To:* sbs_gems at jlab.org
> *Subject:* [Sbs_gems] [EXTERNAL] Fwd: Cosmic data for UV Layer and J1
>
>
>
>
>
> ---------- Forwarded message ---------
> From: *Ezekiel Wertz* <ewertz at email.wm.edu>
> Date: Fri, Nov 5, 2021 at 11:47 AM
> Subject: Cosmic data for UV Layer and J1
> To: <sbs_gem at jlab.org>
>
>
>
> Hi GEM folks,
>
>
>
> Attached you will find cosmic data and plots for the UV layer and J1.
> Taking cosmic data on the UV layer was priority, but we managed to get INFN
> J1 running as well. We took this data earlier this week. There were about
> 500,000 events.
>
>
>
> Other than a few strips that look not great, it looks like the UV layer is
> performing fairly well. Maybe Sean, Anu, or John has more to say about
> that.
>
>
>
> In regards to J1, each module on this layer has 2 shorted sectors. Which
> we see fairly clearly. However, there is a missing APV on the middle
> module. This was disabled because of connection problems that have since
> been better  understood. The top module has a partial or almost missing
> APV, this connection has since been remedied but needs to be checked. So
> this APV on the middle module is the last major thing that needs to be
> resolved for J1. There are some strips on the top and middle module that
> are partial and it needs to be understood if those are bad strips or
> partially disconnected APVs.
>
>
>
> So again the main result for this is the UV layer. But this is also a good
> starting place for J1. Also take note that the empty plots are simply
> because this plotting macro was not adjusted for 2 layers instead of 5.
>
>
>
> Best,
>
> Zeke
>
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