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<p class="MsoNormal"><span style="font-family:"Calibri",sans-serif">Weizhi,<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-family:"Calibri",sans-serif"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-family:"Calibri",sans-serif">Can you provide a comparison of different target materials for GEM efficiency calibration?<o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:black;mso-ligatures:standardcontextual">-Eugene<o:p></o:p></span></p>
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<p class="MsoNormal"><b><span style="font-size:11.0pt;font-family:"Calibri",sans-serif">From:</span></b><span style="font-size:11.0pt;font-family:"Calibri",sans-serif"> Stepan Stepanyan <stepanya@jlab.org>
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<b>Sent:</b> Wednesday, September 03, 2025 12:04<br>
<b>To:</b> Stepan Stepanyan <stepanya@jlab.org><br>
<b>Cc:</b> Eugene Pasyuk <pasyuk@jlab.org>; prad@jlab.org<br>
<b>Subject:</b> Re: [PRad] beryllium target<o:p></o:p></span></p>
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<p class="MsoNormal">and I do not see any reference to the Be target in ERR.<o:p></o:p></p>
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<p class="MsoNormal">Stepan<o:p></o:p></p>
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<p class="MsoNormal">On Sep 3, 2025, at 12:00<span style="font-family:"Arial",sans-serif"> </span>PM, Stepan Stepanyan via PRad <<a href="mailto:prad@jlab.org">prad@jlab.org</a>> wrote:<o:p></o:p></p>
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<p class="MsoNormal">Eugene, <o:p></o:p></p>
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<p class="MsoNormal">I understand lower Z, but has anyone shown that Be vs. Al will make any difference for GEM efficiency calibration?<span class="apple-tab-span"><o:p></o:p></span></p>
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<p class="MsoNormal"><o:p></o:p></p>
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<p class="MsoNormal"><o:p> </o:p></p>
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<p class="MsoNormal">Stepan<o:p></o:p></p>
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<p class="MsoNormal">On Sep 3, 2025, at 11:50<span style="font-family:"Arial",sans-serif"> </span>AM, Eugene Pasyuk <<a href="mailto:pasyuk@jlab.org">pasyuk@jlab.org</a>> wrote:<o:p></o:p></p>
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<p class="MsoNormal"><span style="font-size:11.0pt">It is not a big complication.<o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-size:11.0pt">Be has a lower Z compared to Carbon, therefore less multiple scattering, the electron beam energy is low. I checked with industrial hygiene. There are just a few things to be done: beryllium awareness training
(MED11) for those who will handle the target, and install it in the PRad target chamber (probably 2-3 people). Nitril gloves must be used while handling. ESH has a designated storage cabinet. That's all. The vendor mounts the foil on the Al ring. We are not
doing any modifications here. The ring is attached to the target stick inside the PRad chamber. We have places for two foils. In the first run, we had 1-μm-thick carbon and aluminium foils. They were damaged and need to be replaced. <o:p></o:p></span></p>
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<span style="font-size:11.0pt;font-family:"Calibri",sans-serif">-Eugene</span><span style="font-size:9.0pt;font-family:"Helvetica",sans-serif"><o:p></o:p></span></p>
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<p class="MsoNormal"><b><span style="font-size:11.0pt;font-family:"Calibri",sans-serif">From:</span></b><span class="apple-converted-space"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif"> </span></span><span style="font-size:11.0pt;font-family:"Calibri",sans-serif">Stepan
Stepanyan <<a href="mailto:stepanya@jlab.org">stepanya@jlab.org</a>><br>
<b>Sent:</b><span class="apple-converted-space"> </span>Wednesday, September 3, 2025 11:29<br>
<b>To:</b><span class="apple-converted-space"> </span>Eugene Pasyuk <<a href="mailto:pasyuk@jlab.org">pasyuk@jlab.org</a>><br>
<b>Cc:</b><span class="apple-converted-space"> </span><a href="mailto:prad@jlab.org">prad@jlab.org</a> <<a href="mailto:prad@jlab.org">prad@jlab.org</a>><br>
<b>Subject:</b><span class="apple-converted-space"> </span>Re: [PRad] beryllium target</span><span style="font-size:9.0pt;font-family:"Helvetica",sans-serif">
<o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-size:9.0pt;font-family:"Helvetica",sans-serif">Eugene,
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<p class="MsoNormal"><span style="font-size:9.0pt;font-family:"Helvetica",sans-serif">Why are we going to this complication? Is this a necessary or a wish list item?<o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-size:9.0pt;font-family:"Helvetica",sans-serif">Thanks,<o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-size:9.0pt;font-family:"Helvetica",sans-serif">Stepan<o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-size:9.0pt;font-family:"Helvetica",sans-serif">On Sep 3, 2025, at 10:51 AM, Eugene Pasyuk via PRad <<a href="mailto:prad@jlab.org">prad@jlab.org</a>> wrote:<o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-size:11.0pt">I checked with safety about the rules for Beryllium handling. There are no significant complications. Those who will handle it must get additional training, MED11. <o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-size:11.0pt">Therefore, we can order Beryllium foil to use as an alternative to carbon or aluminum as a point-like target for GEM efficiency calibration.<o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-size:11.0pt">The question is: what thickness do we want?<o:p></o:p></span></p>
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<span style="font-size:11.0pt;font-family:"Calibri",sans-serif">-Eugene</span><span style="font-size:9.0pt;font-family:"Helvetica",sans-serif"><o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-size:9.0pt;font-family:"Helvetica",sans-serif">_______________________________________________<br>
PRad mailing list<br>
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<a href="https://mailman.jlab.org/mailman/listinfo/prad">https://mailman.jlab.org/mailman/listinfo/prad</a><o:p></o:p></span></p>
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<p class="MsoNormal">_______________________________________________<br>
PRad mailing list<br>
<a href="mailto:PRad@jlab.org">PRad@jlab.org</a><br>
<a href="https://mailman.jlab.org/mailman/listinfo/prad">https://mailman.jlab.org/mailman/listinfo/prad</a><o:p></o:p></p>
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