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Hello Abdel,<br class="">
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<div class="">On 4 Mar 2022, at 12.04, abdel al-falou <<a href="mailto:abdel.al-falou@tum.de" class="">abdel.al-falou@tum.de</a>> wrote:</div>
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<div class="">my name is Abdel, I'm currently working with McStas 2.7.1 to simulate the SANS-1 beamline at FRM-II.<br class="">
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I'd like to use the handy ITERATE tool in McStas to slice one beam guide into 54 parts, but I still have some difficulties with that. I have tried running the template from E. Farhi, <Test_Jump_Iterate>, but it only sets/displays two guides instead of the intended
30.<br class="">
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I'd be glad if you could help me figure it out, ideally via the template file.<br class="">
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<div class="">To be completely honest with you, JUMP + ITERATE is in fact a GOTO-mechanism - more or less a hack. :) </div>
<div class="">(see also <a href="https://xkcd.com/292/" class="">https://xkcd.com/292/</a>)</div>
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<div class="">There is only one guide element in play, plus “magic teleportation†of the neutron from end to start of that guide element. This does in fact “workâ€, but will naturally display one guide element only.</div>
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<div class="">My recommendation will always be to avoid JUMP since its implications can be misleading and hard to debug. </div>
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<div class="">I suggest you in fact put all of the 54 guide elements in place, but make use of COPY to ease the copy-pasting. :)</div>
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<div class="">(In McStas 2.7.1 and earlier this means actual c-code-duplication and longer compile-time, but in 3.1 the compilation-time in such cases is much improved, due to the use of TRACE-functions.)</div>
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<div class="">Best,</div>
<div class="">Peter</div>
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<br class="">
Peter Kjær Willendrup<br class="">
Forskningsingeniør, Specialkonsulent<br class="">
Næstformand for DTU Fysik LSU<br class="">
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DTU Physics<br class="">
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