[mcstas-users] Twisted guide simulations

[Peter Link]

Dear Peter and Kim,
since REFSANS at FRMII falls under my regime I had several times thought of
this problem. To my opinion and tests a segmentation into piecewise
straight elements with whatever Guide_xx component does not give the
correct result. One way could be to use Guide_anyshape from Emmanuel. I
have not tested this, but I think its worth a try.
Best regards,
Peter



Am 07.06.2015 um 17:20 schrieb Kim Lefmann:
> Dear Peter,
> 
> I simulated a very long curved guide recently, using piecewise straight
> segments. I realized that I had propagating uncertainties that blew up
> divergence and hence reduced intensity down the guide. While I believe
> this is a correct physical effect (after some thought), I found that to
> emulate a continuously curved guide I had to go to ridiculously short
> guide pieces, like 2-5 cm. Then, intensity was conserved... Perhaps this
> works for you?
> 
> best, Kim
> 
> 
>  On 06/07/2015 10:42 AM, Петр Коник wrote:
>> Dear McStas colleagues,
>>
>> I try to simulate twisted neutron guide (as RefSANS at FRM-II). I've made
>> it of number of straight section rotated relative common axis, but
>> that gives me significantly lower flux than expected. Is there any
>> natural route to model that guide in McStas?
>>
>> Best regards,
>> Peter Konik
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-- 
Dr. Peter Link
Leiter Neutronenoptik
Forschungs-Neutronenquelle Heinz Maier-Leibnitz
Technische Universität München
Lichtenbergstr. 1
85747 Garching