[mcstas-users] Effective region of the source

[Kim Lefmann]

Dear Federico,

This was something we studied a while ago, also in relation to ESS. The 
initial studies were performed using an EXTEND at the source that just 
stored the x and y coordinates. Then, we placed the "Come From" monitor 
last in the instrument, extremely close to the PSD predecing it. The 
"Come From" monitor is also a PSD, but between the two monitors, another 
EXTEND restores the neutron x and y coordinates to be the stored ones. 
Hope this makes sense.

I give you here a link to the thesis of Kaspar Klenø with many of the 
initial results

http://xns.nbi.ku.dk/student_theses/Kaspar_klenoe_phd.pdf

The effect of moderator sizes were studied very carefully by another 
student of mine, Mads Bertelsen (c.c.), but in a more systematic way, in 
order to determine the optimal moderator geometry. Possibly, Mads has 
the time contribute briefly to this discussion - but otherwise he is 
very busy writing up his thesis text right now...

best, Kim


On 03/20/2017 03:11 PM, Federico M. Bertalot wrote:
> Hello,
>
> i am trying to know the effective region of the source. In other 
> words, each time a neutron reachs the detector i want to know, which 
> region of the source it came from.
>
> I think that one possible solution is to create a source component 
> that stores the starting position of each neutron in a new variable. 
> Then, the detector reads this new variable. Maybe this can be done 
> using store_neutron() also, but i dont know how to read the 
> trace-history.
>
> if you know a better solution, please tell me.
>
> Thank you very much.
>
> Federico.
>
>
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