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Dear Peter,<br>
<br>
thank you very much for your help. I was able to implement your
solution, however, it seems necessary to add a SCATTER in the EXTEND
section of the absorber. This may be caused by my rather complex
chopper geometry using several windows and additional WHEN
conditions. I used the Sample_nxs component as it offers pure
transmission without scattering. The code looks now like this:<br>
<br>
COMPONENT window0 = DiskChopper(parameters=values...)<br>
WHEN (condition)<br>
AT (0, 0, z)<br>
GROUP DiskChopper1<br>
EXTEND<br>
%{<br>
if(SCATTERED) do_something();<br>
%}<br>
<br>
COMPONENT window1 = DiskChopper(parameters=values...)<br>
WHEN (condition)<br>
AT (0, 0, z)<br>
GROUP DiskChopper1<br>
EXTEND<br>
%{<br>
if(SCATTERED) do_something();<br>
%}<br>
<br>
COMPONENT absorber = Sample_nxs(<br>
TransOnly=1, IncohScat=0, MultiScat=0,<br>
xwidth=0.5, yheight=0.5, zthick=250e-6,<br>
nxsFileName="boron10.nxs")<br>
WHEN (condition)<br>
AT (0, 0, z)<br>
GROUP DiskChopper1<br>
EXTEND<br>
%{<br>
SCATTER;<br>
%}<br>
<br>
COMPONENT arm = Arm()<br>
WHEN (!condition) // inverse condition here<br>
AT (0, 0, z)<br>
GROUP DiskChopper1<br>
EXTEND<br>
%{<br>
SCATTER;<br>
%}<br>
<br>
<br>
Cheers,<br>
<br>
Marc<br>
<br>
<br>
<div class="moz-cite-prefix">On 11/19/19 1:40 PM, Peter Kjær
Willendrup wrote:<br>
</div>
<blockquote type="cite"
cite="mid:A7C7AAC6-60DA-43D2-A794-ABB6FE7CDA8B@fysik.dtu.dk">
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
Dear Marc,
<div class=""><br class="">
</div>
<div class="">
<div>
<blockquote type="cite" class="">
<div class="">On 19 Nov 2019, at 13.23, Marc Seifert <<a
href="mailto:Marc.Seifert@frm2.tum.de" class=""
moz-do-not-send="true">Marc.Seifert@frm2.tum.de</a>>
wrote:</div>
<br class="Apple-interchange-newline">
<div class="">
<div class="">Hello everyone,<br class="">
<br class="">
we are simulating a chopper system over a large
wavelength spectrum (0.5 to 10 AA). We would like to
consider finite transmission of the choppers and we
expect this to be 1E-7 for 3 AA and up to 0.007 for 1
AA. We would like to simulate the overall impact on the
performance of the instrument by implementing a
transmission probability to the DiskChopper component,
but we are not sure which would be the best approach.<br
class="">
<br class="">
Is it possible to check in the EXTEND section of a
DiskChopper if the neutron was absorbed and then restore
it with a certain probability? Or would it be better to
change the neutron weight instead of absorbing it in the
component? Additionally with a cutoff at a certain
wavelength in order to not propagate every neutron with
very tiny weight through the whole instrument.<br
class="">
<br class="">
Any help is very much appreciated.<br class="">
</div>
</div>
</blockquote>
</div>
<br class="">
</div>
<div class="">I thought of solutions for this in the past, but
never actually implemented anything in practice. What I would do
is probably something like</div>
<div class=""><br class="">
</div>
<div class=""><br class="">
</div>
<div class="">COMPONENT Chopper=DiskChopper(parameters=values…)</div>
<div class="">AT (somewhere)</div>
<div class="">GROUP DiscChopper1</div>
<div class=""><br class="">
</div>
<div class="">
<div class="">COMPONENT Absorber=Incoherent(parameters=values…)</div>
<div class="">AT (somewhere)</div>
<div class="">GROUP DiscChopper1</div>
</div>
<div class=""><br class="">
</div>
<div class="">- This means that if the chopper opening is not hit,
the beam instead hits the following component. Depending on
taste, that component could be Incoherent as shown or maybe even
better PowderN which allows to tune the branches of statistics
going into incoherent scattering, coherent scattering and
“tunnelling”, i.e. keeping the ray direction but taking the
material cross-sections into account, i.e. “absorbing” the
relevant weight.</div>
<div class=""><br class="">
</div>
<div class="">Hope this helps,</div>
<div class=""><br class="">
</div>
<div class="">Peter</div>
<div class=""><br class="">
</div>
<br class="">
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class="">Fysikvej</span></div>
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style="font-size:
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class="">Building
307<o:p
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style="margin:
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class="">
<span
style="font-size:
8pt;
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color: black;"
class="">DK-2800
Kongens Lyngby<o:p
class=""></o:p></span></div>
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style="padding:
0cm;" class="">
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style="margin:
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class="">
<span
style="font-size:
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color: black;"
class="">Direct
+45 2125 4612<o:p
class=""></o:p></span></div>
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</tr>
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style="padding:
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style="margin:
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class="">
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class="">Mobil
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class=""></o:p></span></div>
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class="">
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color: black;"
class="">Fax
+45 4593 2399<o:p
class=""></o:p></span></div>
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