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<p class="MsoNormal"><span style="mso-fareast-language:EN-US">Hi Both,<o:p></o:p></span></p>
<p class="MsoNormal"><span style="mso-fareast-language:EN-US">The model in the multi-layer sample is a very simple one and doesn’t include the complex part. I wrote the component for simple sample consisting of 1 or 2 layers of material. Everything was done
for speed so as to not introduce a really complicated calculation into the simulation.
<o:p></o:p></span></p>
<p class="MsoNormal"><span style="mso-fareast-language:EN-US">I guess that this could be pre-calculated and then interpolation used to be more efficient having read the simulated data from a file.<o:p></o:p></span></p>
<p class="MsoNormal"><span style="mso-fareast-language:EN-US"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="mso-fareast-language:EN-US">It would be easy enough for someone to write a new version of the multi-layer to use the more complicated expressions using a similar setup to the one I wrote as the routine calls the gsl to do the
complex maths. It just needs somebody to take a day or two to work it out.<o:p></o:p></span></p>
<p class="MsoNormal"><span style="mso-fareast-language:EN-US">The biggest problem you will find will be how to input the parameters required to set up the simulation of the model but I guess you could make use of a setup file somewhere to do this in a similar
way to the files used for the crystallographic samples.<o:p></o:p></span></p>
<p class="MsoNormal"><span style="mso-fareast-language:EN-US"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="mso-fareast-language:EN-US">Rob<o:p></o:p></span></p>
<p class="MsoNormal"><span style="mso-fareast-language:EN-US"><o:p> </o:p></span></p>
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<p class="MsoNormal"><b><span lang="EN-US">From:</span></b><span lang="EN-US"> mcstas-users <mcstas-users-bounces@mcstas.org>
<b>On Behalf Of </b>Kim Lefmann<br>
<b>Sent:</b> Sunday, November 5, 2023 9:38 PM<br>
<b>To:</b> Ahmad Alqaisi <aalqais2@asu.edu>; mcstas-users@mcstas.org<br>
<b>Cc:</b> Snow, William Michael <wsnow@indiana.edu><br>
<b>Subject:</b> Re: [mcstas-users] Including the complex part of the optical potential of Neutron in McStas<o:p></o:p></span></p>
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<p class="MsoNormal"><o:p> </o:p></p>
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<p><span style="font-size:12.0pt;color:black">Dear Ahmad,<o:p></o:p></span></p>
<p><span style="font-size:12.0pt;color:black"><o:p> </o:p></span></p>
<p><span style="font-size:12.0pt;color:black">The short reply is: no, this is not included. Neutron guide reflectivities are calculated from fitted experimental data, not from reflectivity equations.<o:p></o:p></span></p>
<p><span style="font-size:12.0pt;color:black"><o:p> </o:p></span></p>
<p><span style="font-size:12.0pt;color:black">To implement this, you would need to come up with the full reflectivity curve, R(q), for a given surface. One of the former reflectivity samples could take as input exactly a file of this sort and use it for the
purpose, but I think this is no longer a part of the distribution.<o:p></o:p></span></p>
<p><span style="font-size:12.0pt;color:black"><o:p> </o:p></span></p>
<p><span style="font-size:12.0pt;color:black">There is also the Multilayer_Sample, which is a contributed component by Robert Dalgliesh. You could look into that and/or contact Robert. This is likely the closest we get to something that fit your needs.<o:p></o:p></span></p>
<p><span style="font-size:12.0pt;color:black"><o:p> </o:p></span></p>
<p><span style="font-size:12.0pt;color:black">best, Kim<o:p></o:p></span></p>
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<p class="MsoNormal"><b><span style="color:black">From:</span></b><span style="color:black"> mcstas-users <<a href="mailto:mcstas-users-bounces@mcstas.org">mcstas-users-bounces@mcstas.org</a>> on behalf of Ahmad Alqaisi <<a href="mailto:aalqais2@asu.edu">aalqais2@asu.edu</a>><br>
<b>Sent:</b> Sunday, November 5, 2023 9:52:02 PM<br>
<b>To:</b> <a href="mailto:mcstas-users@mcstas.org">mcstas-users@mcstas.org</a><br>
<b>Cc:</b> Snow, William Michael<br>
<b>Subject:</b> [mcstas-users] Including the complex part of the optical potential of Neutron in McStas</span>
<o:p></o:p></p>
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<span style="font-size:9.0pt;font-family:"Segoe UI",sans-serif;color:#212121">You don't often get email from
<a href="mailto:aalqais2@asu.edu">aalqais2@asu.edu</a>. <a href="https://aka.ms/LearnAboutSenderIdentification">
Learn why this is important</a><o:p></o:p></span></p>
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<p class="MsoNormal">Dear McStas team, <o:p></o:p></p>
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<p class="MsoNormal"><o:p> </o:p></p>
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<p class="MsoNormal">I'm new to McStas simulations. I would like to ask about the complex part of the optical potential of Neutrons<o:p></o:p></p>
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<p class="MsoNormal"> U=V-i<b><i>W</i></b><o:p></o:p></p>
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<p class="MsoNormal">Is it included in the reflectivity calculations for Neutron Guides? <o:p></o:p></p>
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<p class="MsoNormal"><o:p> </o:p></p>
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<p class="MsoNormal">If not, is there a way to add it to McStas? Can the complex part be added as an additional formula to McStas? for example by adding a formula like the one attached to this email<o:p></o:p></p>
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<p class="MsoNormal"><o:p> </o:p></p>
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<p class="MsoNormal">If you can provide me with a guidance on the script lines that would achieve such a goal, that would be great<o:p></o:p></p>
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<p class="MsoNormal"><o:p> </o:p></p>
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<p class="MsoNormal">Best,<o:p></o:p></p>
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<p class="MsoNormal">Ahmad Alqaisi,<o:p></o:p></p>
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<p class="MsoNormal">Student Researcher at <o:p></o:p></p>
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<p class="MsoNormal">Indiana University Bloomington, US<o:p></o:p></p>
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