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<p class="MsoNormal">Hi Andrew, <o:p></o:p></p>
<p class="MsoNormal">I think this depends on how this ADC distribution compare with the other layers. If it is not a outlier, then I agree with you. But if it is larger than the other chambers, it will be safer to lower the HV a little bit (not too much) we
can quickly see if it affects efficiency (which I would doubt). <o:p></o:p></p>
<p class="MsoNormal">It always safer to operate at the lowest HV that do not affect the performances considering that this is the first layer with the most exposure to high rate
<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">Thanks <o:p></o:p></p>
<p class="MsoNormal">Kondo<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
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<p class="MsoNormal"><b>From:</b> Sbs_gems <sbs_gems-bounces@jlab.org> <b>On Behalf Of
</b>Andrew Puckett<br>
<b>Sent:</b> Sunday, December 5, 2021 11:07 AM<br>
<b>To:</b> Kondo Gnanvo <kagnanvo@jlab.org><br>
<b>Cc:</b> Sbs_gems@jlab.org<br>
<b>Subject:</b> Re: [Sbs_gems] [New Logentry] Follow-up Re: Question UVA UV GEM<o:p></o:p></p>
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<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal" style="margin-bottom:12.0pt">I would not recommend changing the HV based on this plot alone without more care analysis. We inevitably see saturation in some small fraction of events. I don’t think it is anything to worry about. <o:p></o:p></p>
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<p class="MsoNormal">puckett.physics.uconn.edu<o:p></o:p></p>
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<br>
<o:p></o:p></p>
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<p class="MsoNormal" style="margin-bottom:12.0pt">On Dec 5, 2021, at 10:55 AM, <a href="mailto:kagnanvo@jlab.org">
kagnanvo@jlab.org</a> wrote:<o:p></o:p></p>
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<p class="MsoNormal"> <o:p></o:p></p>
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<h1><a href="https://logbooks.jlab.org/entry/3956838">Follow-up Re: Question UVA UV GEM</a>
<o:p></o:p></h1>
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<a href="https://logbooks.jlab.org/entry/3956838/edit?destination=email/send">Edit</a><o:p></o:p></li><li class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto;mso-list:l0 level1 lfo1">
<a href="https://logbooks.jlab.org/entry/3956838/delete?destination=email/send">Delete</a><o:p></o:p></li></ul>
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<p class="author-datetime1">Lognumber <a href="https://logbooks.jlab.org/entry/3956838">
3956838</a>. Submitted by <a href="https://logbooks.jlab.org/user/kagnanvo">kagnanvo</a> on
<a href="https://logbooks.jlab.org/entries?start_date=1638715842&end_date=1638723042&book=BIGBITE&book=HALOG&book=SUPERBIGBITE">
Sun, 12/05/2021 - 10:50</a>. <o:p></o:p></p>
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<b><span style="font-size:9.5pt">Logbooks: <o:p></o:p></span></b></p>
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<span style="font-size:9.5pt"><a href="https://logbooks.jlab.org/book/bigbite">BIGBITE</a>
<a href="https://logbooks.jlab.org/book/halog">HALOG</a> <a href="https://logbooks.jlab.org/book/superbigbite">
SUPERBIGBITE</a><o:p></o:p></span></p>
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<b><span style="font-size:9.5pt">References: <o:p></o:p></span></b></p>
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<span style="font-size:9.5pt"><a href="https://logbooks.jlab.org/entry/3956665">3956665 - Question UVA UV GEM</a><o:p></o:p></span></p>
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<p><span style="color:white">It looks like APV25 saturation which might in</span>dicate that the gain is a bit too high.<br>
GEM expert on call might want to consider lowering HV a little bit (~25 V). Should be safer and not affect efficiency.<o:p></o:p></p>
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<p class="MsoNormal">_______________________________________________<br>
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