[neutron-mc] handling of `POLARISATION PARAMETERS'

[Emmanuel FARHI]

Hello Timur,

this is true, if you wish to set the polarisation, just set the sx, sy and
sz values. In order to monitor the polarisation, you may use the

Monitor_nD(options="sx sy sz")

An example is given in the He3 cell component (contrib), as well as an
instrument example in the www.ill.fr/ill_lib.html#instruments page.
Emmanuel.

> Dear McStas experts,
>
> Sorry, but I couldn't understand how the subj should be used.
> I'd like to generate, say, the polarized neutron with certain
> polarization in the `source' component, and then use these
> components (sx,sy,sz) in the following components. But I read
> in the manual,
>
>     POLARISATION PARAMETERS (sx,sy,sz)
>     This line is necessary only if the comp onent handles p
>     mo difies the spin vector. For an instrument to handle
>     required that *one* of the components contains this line.
>
> and, "s1 & s2 in the STATE PARAMETERS obsolete and cannot be used".
>
> I included POLARISATION PARAMETERS(sx,sy,sz) in my `source' and
> simply `printf' them. I've got (0,1,0), i.e. polarized beam along
> `y' axis. Well, and what? :) How can I generate polarized beam
> along `z' axis (probably, by setting sy = 0 and sz = 1 in the
> `source'?), and then analize them with (any) monitor?
>
> Thanks.
>
>
> --
> WBR,
> Timur
>
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-- 
FARHI Emmanuel <farhi at ill.fr>
Groupe DS/CS, ILL4/156, Tel 04 76 20 71 35
ILL, Grenoble