[mcstas-users] Quartz crystal filter transmission fie

[Peter Link]

Dear Tjatji,

I had a look into your instr file. Your attempt was to use PowderN as 
filter representation.  The literature talks about single crystal quartz 
or sapphire as filter material for this purpose. See for example:

https://doi.org/10.1063/1.1719323 <https://doi.org/10.1063/1.1719323>

You may use a filter_gen component with a trm datafile made from this 
literature data, Al2O3_sapphire.trm is included in the mcstas data 
directory, which you can use as example.

I hope this hint helps you.

Best regards,

Peter

-- 
Dr. Peter Link
Leiter Neutronenoptik
Technische Universität München
Heinz Maier-Leibnitz Zentrum (MLZ)
Lichtenbergstr. 1
85747 Garching
Tel.: +49 (0)89 289 14622
Fax: +49 (0) 89 289 11694


Am 26.08.2021 um 10:36 schrieb Tjatji Tjebane:
>
> Good day,
>
> I am modelling a SANS instrument on the a radial port of a no-cold 
> source reactoron Mcstas 2.7. The source peaks around 1,2 AA and would 
> like to introduce a quartz (SiO2) filter component with transmission 
> that attenuates and thermalizes the fast neutrons to longer 
> wavelengths. This filter is physically installed in the beam tube and 
> a real representation of the setup requires such transmission file. 
> Any idea on how one can do this? The instrument with details on the 
> header is attached. The MCPL file may be forwarded on request.
>
> Thanks in advance.
>
> Regards
>
> Tjatji Tjebane
>
> Instrument Scientist
>
> *Tel: *+27 12 305 5852
>
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