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<p class="MsoNormal"><span style="color:#1F497D">Peter, Erik,<o:p></o:p></span></p>
<p class="MsoNormal"><span style="color:#1F497D">I apologise, I’ve just noticed the note in the component description regarding the hard coding of the polarisation direction.<o:p></o:p></span></p>
<p class="MsoNormal"><span style="color:#1F497D">I will modify my simulations accordingly.<o:p></o:p></span></p>
<p class="MsoNormal"><span style="color:#1F497D"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="color:#1F497D">Sorry everyone<o:p></o:p></span></p>
<p class="MsoNormal"><span style="color:#1F497D"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="color:#1F497D">Rob<o:p></o:p></span></p>
<p class="MsoNormal"><span style="color:#1F497D"><o:p> </o:p></span></p>
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<p class="MsoNormal"><b><span lang="EN-US" style="mso-fareast-language:EN-GB">From:</span></b><span lang="EN-US" style="mso-fareast-language:EN-GB"> mcstas-users <mcstas-users-bounces@mcstas.org>
<b>On Behalf Of </b>Robert Dalgliesh - UKRI STFC<br>
<b>Sent:</b> 29 May 2020 15:25<br>
<b>To:</b> McStas <mcstas-users@mcstas.org><br>
<b>Subject:</b> [mcstas-users] Rotating polarising mirror components<o:p></o:p></span></p>
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<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">Hi Peter, Erik,<o:p></o:p></p>
<p class="MsoNormal">I’ve been looking in more detail at what happens when I rotate a polarising mirror or v-mirror in mcstas as a result of getting repeated assert errors from the polarisation being greater than 1.<o:p></o:p></p>
<p class="MsoNormal">I am having trouble working out if the polarisation vector is rotated correctly if e.g. Pol_mirror is rotated by 90deg to be in a horizontal rather than vertical geometry. The code performs a calculation of probabilities based on the sy
component (GetMonoPolRefProb(FN, FM, sy, &refWeight)) but if I have a polarisation in the x-z plane prior to the component I have been unable to determine what is happening.<o:p></o:p></p>
<p class="MsoNormal">In order to makes things correct the incoming spin vector would need to be rotated by 90 degrees on entering the pol_mirror component. Is this done in some hidden way or do I need to rewrite the components to deal with this?<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">Thanks<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">Rob<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal"><span style="mso-fareast-language:EN-GB">===================================<o:p></o:p></span></p>
<p class="MsoNormal"><span style="mso-fareast-language:EN-GB">Dr. Robert Dalgliesh<o:p></o:p></span></p>
<p class="MsoNormal"><span style="mso-fareast-language:EN-GB">ISIS Neutron and Muon Source<o:p></o:p></span></p>
<p class="MsoNormal"><span style="mso-fareast-language:EN-GB">STFC Rutherford Appleton Laboratory<o:p></o:p></span></p>
<p class="MsoNormal"><span style="mso-fareast-language:EN-GB">R3 1.29<o:p></o:p></span></p>
<p class="MsoNormal"><span style="mso-fareast-language:EN-GB">Harwell Oxford<o:p></o:p></span></p>
<p class="MsoNormal"><span style="mso-fareast-language:EN-GB">Didcot<o:p></o:p></span></p>
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<p class="MsoNormal"><o:p> </o:p></p>
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