[mcstas-users] Effective region of the source

[Emmanuel FARHI]

Hi Federico,

an other, simple, way is to make use of the PreMonitor_nD which allow to 
look at the status of a neutron at a location 1, for neutrons that reach 
an other, further, location 2. As this is a Monitor_nD, you may monitor 
any neutron variable, and more.

Emmanuel.


On 03/20/2017 03:59 PM, Kim Lefmann wrote:
> 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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-- 
Emmanuel FARHI,www.ill.eu/computing/people/emmanuel-farhi \|/ ____ \|/
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