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Dear Dariusz,<br class="">
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<div class="">On 13 Dec 2018, at 12.14, Dariusz Wardecki - UKRI STFC <<a href="mailto:dariusz.wardecki@stfc.ac.uk" class="">dariusz.wardecki@stfc.ac.uk</a>> wrote:</div>
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<div class="">I am trying to simulate texture in a powder sample using McStas-2.4.1. For this purpose I wanted to use the Single_crystal component with the "powder" parameter. I started with an ideal powder using powder=1 and two monitors PSD_4pi and TOF at
90 deg to test the results. It turns out that when I compare this result with the one from the PowderN component I get completely different distribution of neutrons on the sphere as well as the wrong intensities from TOF. It does not look like an ideal powder
at all.<br class="">
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Does anybody have an idea what I am doing wrong?<br class="">
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<br class="">
I use the following option:<br class="">
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SPLIT 200 COMPONENT sample = Single_crystal(radius=0.002, yheight=0.01,<br class="">
reflections="Al.lau", powder=1, order=1, mosaic=5)<br class="">
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<div class="">As I remember, the only ever “agreement” that was established between the output of PowderN and Single_crystal was that the scattering pattern looked “about the same” and with the same order of magnitude.</div>
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<div class="">To achieve that, I also remember adjusting mosaicity and delta_d_d to quite excessive values.</div>
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<div class="">I will put on my list for the next release that this is documented by means of an instrument file! As I remember Erik Knudsen also has a solution in the pipe which is more along the lines of actual texture “maps”/distributions, it may be that
we can also include that in the next release.</div>
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<div class="">(Whether this will be 2.5.1 or 2.6 or… is currently not completely clear as 2.5 was released yesterday. :-) )</div>
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<div class="">Best and hope this makes things a little clearer,</div>
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<div class="">Peter Willendrup</div>
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<br class="">
Peter Kjær Willendrup<br class="">
Forskningsingeniør, Specialkonsulent<br class="">
Næstformand for DTU Fysik LSU<br class="">
<br class="">
DTU Physics<br class="">
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