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<div style="font-family: Calibri, Arial, Helvetica, sans-serif; font-size: 12pt; color: rgb(0, 0, 0);">
need to be a little careful since there are a lot of accidentals </div>
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if this was with the coincidence and prescaled bbcal trigger.</div>
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May need to put a cut on good coincidence.</div>
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Cheers,</div>
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Mark</div>
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<div id="divRplyFwdMsg" dir="ltr"><font face="Calibri, sans-serif" style="font-size:11pt" color="#000000"><b>From:</b> Sbs_gems <sbs_gems-bounces@jlab.org> on behalf of adr--- via Sbs_gems <sbs_gems@jlab.org><br>
<b>Sent:</b> Monday, October 17, 2022 4:45 PM<br>
<b>To:</b> sbs_gems@jlab.org <sbs_gems@jlab.org><br>
<b>Subject:</b> [Sbs_gems] [New Logentry] SBS GEM Latency Scan Results</font>
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<h1 class="x_node-title"><a href="https://logbooks.jlab.org/entry/4061421" rel="bookmark">SBS GEM Latency Scan Results</a>
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<li><a href="https://logbooks.jlab.org/entry/4061421/edit?destination=email/send">Edit</a></li><li><a href="https://logbooks.jlab.org/entry/4061421/delete?destination=email/send">Delete</a></li></ul>
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<p class="x_author-datetime">Lognumber <a href="https://logbooks.jlab.org/entry/4061421" class="x_lognumber" data-lognumber="4061421">
4061421</a>. Submitted by <a href="https://logbooks.jlab.org/user/adr">adr</a> on
<time datetime="2022-10-17T16:41:50-0400"><a href="https://logbooks.jlab.org/entries?start_date=1666035710&end_date=1666042910&book=HALOG&book=SUPERBIGBITE">Mon, 10/17/2022 - 16:41</a></time>.
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<th>Logbooks: </th>
<td><a href="https://logbooks.jlab.org/book/halog">HALOG</a> <a href="https://logbooks.jlab.org/book/superbigbite">
SUPERBIGBITE</a></td>
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<th>Tags: </th>
<td><a href="https://logbooks.jlab.org/tag/gem">GEM</a></td>
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<th>Entry Makers: </th>
<td>adr</td>
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<th>References: </th>
<td><a href="https://logbooks.jlab.org/entry/4057468">4057468 - BB and SBS GEM, MPD trigger time difference = 240 ns = 10 latency units</a></td>
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<p>We found that our guess value for global latency of "102" for SBS GEM latency is correct/very close.</p>
<p>Look at page 3, 3rd raw, 3rd and 4th plots in the attached files. These are max time sample histos for U/X and V/Y strips respectively, for events with track cuts.</p>
<p>At 102 latency -> <a href="https://logbooks.jlab.org/files/2022/10/4061348/summaryPlots_1998_sbs_gem.pdf">
https://logbooks.jlab.org/files/2022/10/4061348/summaryPlots_1998_sbs_ge...</a><br>
At 108 latency -> <a href="https://logbooks.jlab.org/files/2022/10/4061354/summaryPlots_1999_sbs_gem.pdf">
https://logbooks.jlab.org/files/2022/10/4061354/summaryPlots_1999_sbs_ge...</a><br>
At 96 latency -> <a href="https://logbooks.jlab.org/files/2022/10/4061357/summaryPlots_2000_sbs_gem.pdf">
https://logbooks.jlab.org/files/2022/10/4061357/summaryPlots_2000_sbs_ge...</a></p>
<p>At 102 latency, we see a peak is at 5th time sample. At both 108 and and 96, we clearly don't see a distribution and suggests that the latency is off.<br>
We will ideally want to peak at the 4th time sample just like the BB GEMs. So we will decrease the latency by 1 unit and see.
<a href="https://logbooks.jlab.org/entry/4061417">https://logbooks.jlab.org/entry/4061417</a></p>
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