Dear Ryan
I am not completely sure I understand your question. I try to answer
below, hoping it helps.
The FLUKA mcs algorithm fully uses the Moliere distribution, it is the
Moliere distribution itself which "naturally" goes into the single
scattering one (or more exactly the single scattering one as described by
the Moliere expression for single scattering) at large angles.
In short, FLUKA samples from the full Moliere distribution. Users can choose
to select alternatively single scattering (very CPU expensive), or some
compromise (eg single scattering at boundaries and/or for steps too short
for the range of applicability of Moliere). There is a description on the
manual.
Concerning the 1992 paper, it is still a good reference for the present
status of the mcs in the code, be careful that there are a few typos in
the formulae!
Alfredo
> Dear FLUKA experts,
>
> I'm trying to understand FLUKA's multiple scattering model. Looking at "An
> improved multiple scattering model for charged particle transport,"
> (Ferrari, et al, 1992) in FLUKA the Moliere multiple scattering
> distribution goes over into the single scattering cross section at angles
> larger than a certain angle.
>
> Is the single scattering cross section used for this purpose in the small
> angle approximation (ala equation 18) or is it the full cross section (ala
> equation 16)?
>
> Thank you.
>
> --
> Ryan Brosch
> Ph.D Candidate
> Department of Physics
> Arizona State University
>
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Received on Mon Jun 06 2022 - 10:56:27 CEST