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Another R&D question for the Tungsten target: Tungsten is known
to be quite brittle, and many thermal cycles could make it more so
because of non-uniform heating by the beam and the internal stresses
coming with it. So the R&D will require corresponding
assessments and tests.<br>
<br>
<div class="moz-cite-prefix">On 5/3/2016 9:53 AM, Pavel Degtiarenko
wrote:<br>
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<blockquote cite="mid:5728AD56.1090203@jlab.org" type="cite">
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Hi All,<br>
<br>
I think we have a couple of major R&D questions that should be
addressed in this project.<br>
<br>
The first one, related to Physics: we need the cross sections for
Ga-71(gamma,alpha)Cu-67 at least with some reasonable accuracy of
20-30%. All technical solutions will depend on that directly.<br>
<br>
The second one, related to the target R&D: the question of the
attachment of Cu-67 to the Tungsten walls. Is there a chance that
a large portion of Cu-67 produced in Gallium during the run will
alloy itself with Tungsten and never come out. Is there any
chemical solution that could be used to wash/rinse the target
after irradiation to extract Copper (but keep Tungsten)?<br>
<br>
Best regards,<br>
Pavel<br>
<br>
<br>
<div class="moz-cite-prefix">On 5/2/2016 3:59 PM, Hari Areti
wrote:<br>
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<blockquote
cite="mid:711687510.21170973.1462219160220.JavaMail.zimbra@jlab.org"
type="cite">
<div style="font-family: arial, helvetica, sans-serif;
font-size: 12pt; color: #000000">
<div>Here is the beginning of writing down target system
requirements. Add missing information,<br data-mce-bogus="1">
</div>
<div>edit out errors, etc.<br data-mce-bogus="1">
</div>
<div>Thanks,<br data-mce-bogus="1">
</div>
<div>-H<br data-mce-bogus="1">
</div>
</div>
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