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<p>Dear Tjatji,</p>
<p>I had a look into your instr file. Your attempt was to use
PowderN as filter representation. The literature talks about
single crystal quartz or sapphire as filter material for this
purpose. See for example:<br>
</p>
<p> <a href="https://doi.org/10.1063/1.1719323">https://doi.org/10.1063/1.1719323</a></p>
<p>You may use a filter_gen component with a trm datafile made from
this literature data, Al2O3_sapphire.trm is included in the mcstas
data directory, which you can use as example.</p>
<p>I hope this hint helps you.</p>
<p>Best regards,</p>
<p>Peter<br>
</p>
<pre class="moz-signature" cols="72">--
Dr. Peter Link
Leiter Neutronenoptik
Technische Universität München
Heinz Maier-Leibnitz Zentrum (MLZ)
Lichtenbergstr. 1
85747 Garching
Tel.: +49 (0)89 289 14622
Fax: +49 (0) 89 289 11694</pre>
<p><br>
</p>
<div class="moz-cite-prefix">Am 26.08.2021 um 10:36 schrieb Tjatji
Tjebane:<br>
</div>
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<p class="MsoNormal"><span lang="EN-US">Good day,<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US"><o:p> </o:p></span></p>
<p class="MsoNormal"><span lang="EN-US">I am modelling a SANS
instrument on the a radial port of a no-cold source reactor<span
style="color:#1F497D">
</span>on Mcstas 2.7. The source peaks around 1,2 AA and
would like to introduce a quartz (SiO2) filter component
with transmission that attenuates and thermalizes the fast
neutrons to longer wavelengths. This filter is physically
installed in the beam tube and a real representation of the
setup requires such transmission file. Any idea on how one
can do this? The instrument with details on the header is
attached. The MCPL file may be forwarded on request.<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US"><o:p> </o:p></span></p>
<p class="MsoNormal"><span lang="EN-US">Thanks in advance.<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US"><o:p> </o:p></span></p>
<p class="MsoNormal"><span lang="EN-US">Regards<o:p></o:p></span></p>
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Tjebane</font></p>
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