<div dir="ltr">Hi Zeke,<div><br></div><div>I do not think that this stripe pattern is caused by scintillators. We see that the stripes match up perfectly with the APVs on one backplane, on each of the GEM modules. My guess is that the mapping is incorrect for one of the backplanes. If the mapping is flipped then the clustering algorithm would simply cluster the noise it sees. I think the brighter stripes have the correct mapping and the stripes with less hits have something like an axis flipped.</div><div><br></div><div>Best,<br>Sean</div></div><br><div class="gmail_quote"><div dir="ltr" class="gmail_attr">On Thu, Dec 9, 2021 at 2:48 PM Ezekiel Wertz <<a href="mailto:ewertz@email.wm.edu">ewertz@email.wm.edu</a>> wrote:<br></div><blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex"><div dir="ltr"><div>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.</div><div><br></div><div>Zeke<br></div></div><br><div class="gmail_quote"><div dir="ltr" class="gmail_attr">On Thu, Dec 9, 2021 at 2:45 PM Ezekiel Wertz <<a href="mailto:ewertz@email.wm.edu" target="_blank">ewertz@email.wm.edu</a>> wrote:<br></div><blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex"><div dir="ltr"><div>Hi GEM folks,</div><div><br></div><div>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.<br></div><div><br></div><div>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.</div><div><br></div><div>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.</div><div><br></div><div>cluster_1092: Taken on 12/7/2021. Layer 0 is J3. ~1M events taken. Latency is 26, which is better. Maybe not best.</div><div><br></div><div>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.</div><div><br></div><div>Best,</div><div>Zeke<br></div></div>
</blockquote></div>
_______________________________________________<br>
Sbs_gems mailing list<br>
<a href="mailto:Sbs_gems@jlab.org" target="_blank">Sbs_gems@jlab.org</a><br>
<a href="https://mailman.jlab.org/mailman/listinfo/sbs_gems" rel="noreferrer" target="_blank">https://mailman.jlab.org/mailman/listinfo/sbs_gems</a><br>
</blockquote></div>