IN6 monochromator
Markus Poehlmann
poehlman at ill.fr
Fri Mar 3 15:00:21 CET 2000
Thank you very much for your reply and for the example instrument. The reason
why I asked you once more was that we have no one mono crystal monochromator
but 3 curved monochromators each consisting of 7 mono crystals. What I wanted
to do was to introduce a Monte Carlo choice in the curved monochromator
component (Mon2_foc) written by Peter Link.
I think for a further proceeding there are now 2 possible ways: Either to
introduce the Monte Carlo Choice in Mon2_foc or to modify the
Mosaic-anisotropic component in a way that there are 7 mono crystals instead
of one.
I will try both of them.
Unfortunately we had only the McStas 1.1 manual so that I could not find
these things like randnorm().
Markus Poehlmann
Kristian Nielsen wrote:
> > Date: Thu, 02 Mar 2000 17:56:58 +0100
> > From: Markus Poehlmann <poehlman at ill.fr>
>
> > So what we would need is a M o n t e C a r l o choice between scattering
> > and unscattered propagation. Could you please tell us how it would be
>
> This is exactly what the Mosaic_anisotropic component does. It computes
> the scattering probability for the given incoming neutron and makes a
> Monte Carlo choice between scattering or transmitting with this
> probability. See the manual for McStas v1.2 page 59.
>
> I think an example may be appropriate. I have written a simple
> instrument with three monochromators in a neutron beam, each one
> focusing at a different angle (88, 90, and 92 degrees) onto a
> detector. See
>
> http://neutron.risoe.dk/mcstas/support/poehlman/mono_test.html
>
> I hope this will get you started, otherwise just ask again, or phone me
> on the number below.
>
> > problem? What e.g. does randnorm() exactly do?
>
> It returns a random number from a normal distribution with mean zero and
> std. deviation 1. See manual page 82.
>
> - Kristian.
>
> --
> Kristian Nielsen kristian.nielsen at risoe.dk
> Risø National Laboratory
> Condensed Matter Physics and Chemistry Department
> Tel. +45 4677 5515 Fax +45 4677 4790
> Encryption PGP key http://neutron.risoe.dk/kn.txt
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