[mcstas-users] Twisted guide simulations

Kim Lefmann lefmann at nbi.ku.dk
Sun Jun 7 17:20:27 CEST 2015

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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