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and I do not see any reference to the Be target in ERR.
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<div>Stepan<br id="lineBreakAtBeginningOfMessage">
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<div>On Sep 3, 2025, at 12:00 PM, Stepan Stepanyan via PRad <prad@jlab.org> wrote:</div>
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Eugene,
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<div>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" style="white-space:pre">
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<div>Stepan<br id="lineBreakAtBeginningOfMessage">
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<div>On Sep 3, 2025, at 11:50 AM, Eugene Pasyuk <pasyuk@jlab.org> wrote:</div>
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It is not a big complication.</div>
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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. </div>
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<p class="elementToProof" style="margin-top: 1em; margin-bottom: 1em;"><span style="font-family: Calibri, sans-serif; font-size: 11pt;">-Eugene</span></p>
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<font face="Calibri, sans-serif" style="font-size: 11pt;"><b>From:</b><span class="Apple-converted-space"> </span>Stepan Stepanyan <stepanya@jlab.org><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 <pasyuk@jlab.org><br>
<b>Cc:</b><span class="Apple-converted-space"> </span>prad@jlab.org <prad@jlab.org><br>
<b>Subject:</b><span class="Apple-converted-space"> </span>Re: [PRad] beryllium target</font>
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Eugene,
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<div>Why are we going to this complication? Is this a necessary or a wish list item?</div>
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<div>Thanks,</div>
<div>Stepan<br id="x_lineBreakAtBeginningOfMessage">
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<div>On Sep 3, 2025, at 10:51 AM, Eugene Pasyuk via PRad <prad@jlab.org> wrote:</div>
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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. </div>
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Therefore, we can order Beryllium foil to use as an alternative to carbon or aluminum as a point-like target for GEM efficiency calibration.</div>
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The question is: what thickness do we want?</div>
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<p style="margin-top: 1em; margin-bottom: 1em;"><span style="font-family: Calibri, sans-serif; font-size: 11pt;">-Eugene</span></p>
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