<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8">
<style type="text/css" style="display:none;"> P {margin-top:0;margin-bottom:0;} </style>
</head>
<body dir="ltr">
<div style="font-family: Aptos, Aptos_EmbeddedFont, Aptos_MSFontService, Calibri, Helvetica, sans-serif; font-size: 11pt; color: rgb(0, 0, 0);" class="elementToProof">
It is not a big complication.</div>
<div style="font-family: Aptos, Aptos_EmbeddedFont, Aptos_MSFontService, Calibri, Helvetica, sans-serif; font-size: 11pt; color: rgb(0, 0, 0);" class="elementToProof">
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>
<div class="elementToProof" id="Signature">
<div style="font-family: Aptos, Aptos_EmbeddedFont, Aptos_MSFontService, Calibri, Helvetica, sans-serif; font-size: 11pt; color: rgb(0, 0, 0);" class="elementToProof">
<br>
</div>
<p style="margin-top: 1em; margin-bottom: 1em;" class="elementToProof"><span style="font-family: Calibri, sans-serif; font-size: 11pt; color: black;">-Eugene</span></p>
<p style="margin-top: 1em; margin-bottom: 1em;" class="elementToProof"><span style="font-family: Calibri, sans-serif; font-size: 11pt; color: black;"> </span></p>
<p style="margin-top: 1em; margin-bottom: 1em;" class="elementToProof"> </p>
</div>
<div id="appendonsend"></div>
<hr style="display:inline-block;width:98%" tabindex="-1">
<div id="divRplyFwdMsg" dir="ltr"><font face="Calibri, sans-serif" style="font-size:11pt" color="#000000"><b>From:</b> Stepan Stepanyan <stepanya@jlab.org><br>
<b>Sent:</b> Wednesday, September 3, 2025 11:29<br>
<b>To:</b> Eugene Pasyuk <pasyuk@jlab.org><br>
<b>Cc:</b> prad@jlab.org <prad@jlab.org><br>
<b>Subject:</b> Re: [PRad] beryllium target</font>
<div> </div>
</div>
<div style="line-break:after-white-space">Eugene,
<div><br>
</div>
<div>Why are we going to this complication? Is this a necessary or a wish list item?</div>
<div><br>
</div>
<div>Thanks,</div>
<div>Stepan<br id="x_lineBreakAtBeginningOfMessage">
<div><br>
<blockquote type="cite">
<div>On Sep 3, 2025, at 10:51 AM, Eugene Pasyuk via PRad <prad@jlab.org> wrote:</div>
<br class="x_Apple-interchange-newline">
<div>
<div style="font-style:normal; font-variant-caps:normal; font-weight:400; letter-spacing:normal; text-align:start; text-indent:0px; text-transform:none; white-space:normal; word-spacing:0px; text-decoration:none; font-family:Aptos,Aptos_EmbeddedFont,Aptos_MSFontService,Calibri,Helvetica,sans-serif; font-size:11pt">
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>
<div style="font-style:normal; font-variant-caps:normal; font-weight:400; letter-spacing:normal; text-align:start; text-indent:0px; text-transform:none; white-space:normal; word-spacing:0px; text-decoration:none; font-family:Aptos,Aptos_EmbeddedFont,Aptos_MSFontService,Calibri,Helvetica,sans-serif; font-size:11pt">
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>
<div style="font-style:normal; font-variant-caps:normal; font-weight:400; letter-spacing:normal; text-align:start; text-indent:0px; text-transform:none; white-space:normal; word-spacing:0px; text-decoration:none; font-family:Aptos,Aptos_EmbeddedFont,Aptos_MSFontService,Calibri,Helvetica,sans-serif; font-size:11pt">
The question is: what thickness do we want?</div>
<div id="x_Signature" style="font-family:Helvetica; font-size:12px; font-style:normal; font-variant-caps:normal; font-weight:400; letter-spacing:normal; text-align:start; text-indent:0px; text-transform:none; white-space:normal; word-spacing:0px; text-decoration:none">
<p style="margin-top:1em; margin-bottom:1em"><span style="font-family:Calibri,sans-serif; font-size:11pt">-Eugene</span></p>
<div style="margin-top:1em; margin-bottom:1em"><span style="font-family:Calibri,sans-serif; font-size:11pt"> </span><br class="x_webkit-block-placeholder">
</div>
<div style="margin-top:1em; margin-bottom:1em"> <br class="x_webkit-block-placeholder">
</div>
</div>
<span style="font-family:Helvetica; font-size:12px; font-style:normal; font-variant-caps:normal; font-weight:400; letter-spacing:normal; text-align:start; text-indent:0px; text-transform:none; white-space:normal; word-spacing:0px; text-decoration:none; float:none; display:inline!important">_______________________________________________</span><br style="font-family:Helvetica; font-size:12px; font-style:normal; font-variant-caps:normal; font-weight:400; letter-spacing:normal; text-align:start; text-indent:0px; text-transform:none; white-space:normal; word-spacing:0px; text-decoration:none">
<span style="font-family:Helvetica; font-size:12px; font-style:normal; font-variant-caps:normal; font-weight:400; letter-spacing:normal; text-align:start; text-indent:0px; text-transform:none; white-space:normal; word-spacing:0px; text-decoration:none; float:none; display:inline!important">PRad
mailing list</span><br style="font-family:Helvetica; font-size:12px; font-style:normal; font-variant-caps:normal; font-weight:400; letter-spacing:normal; text-align:start; text-indent:0px; text-transform:none; white-space:normal; word-spacing:0px; text-decoration:none">
<a href="mailto:PRad@jlab.org" style="font-family:Helvetica; font-size:12px; font-style:normal; font-variant-caps:normal; font-weight:400; letter-spacing:normal; orphans:auto; text-align:start; text-indent:0px; text-transform:none; white-space:normal; widows:auto; word-spacing:0px">PRad@jlab.org</a><br style="font-family:Helvetica; font-size:12px; font-style:normal; font-variant-caps:normal; font-weight:400; letter-spacing:normal; text-align:start; text-indent:0px; text-transform:none; white-space:normal; word-spacing:0px; text-decoration:none">
<a href="https://mailman.jlab.org/mailman/listinfo/prad" style="font-family:Helvetica; font-size:12px; font-style:normal; font-variant-caps:normal; font-weight:400; letter-spacing:normal; orphans:auto; text-align:start; text-indent:0px; text-transform:none; white-space:normal; widows:auto; word-spacing:0px">https://mailman.jlab.org/mailman/listinfo/prad</a></div>
</blockquote>
</div>
<br>
</div>
</div>
</body>
</html>