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Hi Peter,
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<div>On 24 Apr 2025, at 13.55, Петр Коник via mcstas-users <mcstas-users@mcstas.org> wrote:</div>
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<div>Can you explain me the intended use of Spin_random component? What are the benefits of assigning polarization to trajectories before the polarizer?
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<div>The component was mainly added to allow defining an “unpolarised beam” at the “full beam level” (i.e. with a set polarisation pr. ray but a net 0 polarisation) to allow comparing with all rays having sx=sy=sz=0 (i.e. with each ray unpolarised).</div>
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<div>Moreover, when used in combination with Pol_Vmirror component it results in polarization over 1 if two components are rotated 90 degrees relative to each other.<br>
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<div>We have recently made a fix to that component (i.e. ~ 1 month ago) that I would think rectifies this problem - see <a href="https://github.com/mccode-dev/McCode/commit/55e3989eb05150a7671523749f30dd462e19b266">https://github.com/mccode-dev/McCode/commit/55e3989eb05150a7671523749f30dd462e19b266</a>. </div>
<div>The logic is that a given polariser / analyser defines a definition of “up/down”, meaning post to “measurement” the other components should be put to zero.</div>
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<div>How recent a version are you running? Chances are that 3.5.25 (which is only on conda-forge at the moment) would fix this.</div>
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<div>Otherwise stay tuned for 3.5.26 that I can promote to become a “full” release including .deb packages, Windows installer etc.</div>
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<div>Best,</div>
<div>Peter W</div>
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Peter Kjær Willendrup<br>
Forskningsingeniør, Specialkonsulent<br>
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DTU Physics<br>
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307</span><br style="font-family: Helvetica; font-size: 12px; font-style: normal; font-variant-caps: normal; font-weight: 400; letter-spacing: normal; orphans: auto; text-align: start; text-indent: 0px; text-transform: none; white-space: normal; widows: auto; word-spacing: 0px; -webkit-text-stroke-width: 0px; text-decoration: none; caret-color: rgb(0, 0, 0); color: rgb(0, 0, 0);">
<span style="font-family: Helvetica; font-size: 12px; font-style: normal; font-variant-caps: normal; font-weight: 400; letter-spacing: normal; orphans: auto; text-align: start; text-indent: 0px; text-transform: none; white-space: normal; widows: auto; word-spacing: 0px; -webkit-text-stroke-width: 0px; text-decoration: none; caret-color: rgb(0, 0, 0); color: rgb(0, 0, 0); float: none; display: inline !important;">DK-2800
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305</span><br style="caret-color: rgb(0, 0, 0); color: rgb(0, 0, 0); font-family: Helvetica; font-size: 12px; font-style: normal; font-variant-caps: normal; font-weight: 400; letter-spacing: normal; orphans: auto; text-align: start; text-indent: 0px; text-transform: none; white-space: normal; widows: auto; word-spacing: 0px; -webkit-text-stroke-width: 0px; text-decoration: none;">
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+45 2125 4612</span><br style="font-family: Helvetica; font-size: 12px; font-style: normal; font-variant-caps: normal; font-weight: 400; letter-spacing: normal; orphans: auto; text-align: start; text-indent: 0px; text-transform: none; white-space: normal; widows: auto; word-spacing: 0px; -webkit-text-stroke-width: 0px; text-decoration: none; caret-color: rgb(0, 0, 0); color: rgb(0, 0, 0);">
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