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

[Sean Jeffas]

Hi All,

Here are the results using 2 hit minimum clusters. I think the UV GEM
mapping looks fine. However there are a lot of areas with missing strips
adding up (I count at least 7 areas). It looks to be about 5-10% of the
active area in missing strips. Since we have time, as Bogdan suggests, I
will try to fix as many as I can.

Best,
Sean

On Fri, Nov 5, 2021 at 1:56 PM Gnanvo, Kondo (kg6cq) <kg6cq at virginia.edu>
wrote:

> Hi Sean,
>
> Maybe you are right, but please double-check carefully without assumption
> that just because you duplicate the same mapping for the other chambers,
> that you got all your mapping right.
>
>
>
> I see a lot of patterns in both 2D hit map and 1D hit distribution that
> make me suspect that there is a mapping issue, though I am not prepare to
> bet my life on this
>
>
>
> Best regards
>
> Kondo
>
>
>
> *From:* Sean Jeffas <sj9ry at virginia.edu>
> *Sent:* Friday, November 5, 2021 1:48 PM
> *To:* Gnanvo, Kondo (kg6cq) <kg6cq at virginia.edu>
> *Cc:* Ezekiel Wertz <ewertz at email.wm.edu>; sbs_gems at jlab.org
> *Subject:* Re: [Sbs_gems] [EXTERNAL] Fwd: Cosmic data for UV Layer and J1
>
>
>
> 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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