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<p>Hi Erik,</p>
<p>as far as I can see the problem is that in McStas Components the
particle is always transported to the "entrance". Here if you have
a look into the code of the component you realize that it uses the
inner radius as entrance. If you turn it by 180 degrees in the
instr. file this makes the code propagating the neutron directly
to the exit. In short this component doesn't allow for inverted
use.</p>
<p>Best regards</p>
<p>Peter<br>
</p>
<div class="moz-cite-prefix">Am 17.08.2021 um 08:36 schrieb Walz,
Erik:<br>
</div>
<blockquote type="cite"
cite="mid:20210817083622.Horde.tfS9lTURVJ1ybnIgJWOnPQ6@hermes.frm2.tum.de">Dear
All,
<br>
<br>
We currently are trying to use a radial collimator in front of the
sample (primary side) to achieve a defined gauge volume width at
the sample position. Thus, the collimator is rotated and the
neutrons enter from the opposite side than usual. Unfortunately,
results make no sense at all. If we turn the collimator the other
way around as a test, we see a reasonable image on the detector,
so the component itself seems to be logically defined.
<br>
<br>
The file is attached below. We would be very grateful about tips
or suggestions to solve the issue for using a radial collimator at
the primary side.
<br>
<br>
Best regards,
<br>
<br>
Erik Walz
<br>
<br>
<br>
<fieldset class="mimeAttachmentHeader"></fieldset>
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</blockquote>
<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>
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