[mcstas-users] The Difference between PowderN and Isotropic SQW

Emmanuel FARHI farhi at ill.fr
Sun Oct 11 22:39:49 CEST 2009

Hi Stephen

the PowderN is slightly faster than Iso Sqw, but this latter can also
handle multiple scattering. Also, Sqw was initially designed for liquids,
and was adapted for powders. Depending on the initial F2(q) range
specified in the powder struture file (Lau, Laz, Fullprof...) Sqw may miss
some events if it does not fit the available dynamic range (which depends
on incident energy).

I would recommend PowderN still for most cases.


> Hello,
>       I have been using the PowderN and Isotropic_SQW for some powder
> scattering simulations, and they seem to give functionally identical
> results. Should I be using one rather than the other?
> Stephen Begley.
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FARHI Emmanuel <farhi at ill.fr>
Groupe DS/CS, ILL4/156, Tel 04 76 20 71 35
ILL, Grenoble

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