|Message: Re: MuMultipleScattering not listed||Not Logged In (login)|
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On Fri, 21 Jun 2013 12:15:14 GMT, Kendall wrote:
> Thank you very much for your reply. I had seen before that when I set > the verbosity high (to 4 as you suggest) that muMsc is invoked at each > step (along with Transp, muIoni, muBrem, muPairProd). I suppose what I > don't understand is what is meant by 'invoked'. My understanding of it > was that these listed processes were called on as possible candidates > for the process during that step but that only the step-limiting process > was the one to occur. Your comment definitely suggests that this is the > wrong way to look at it. > > Could you clarify this for me a little bit? Or even point to a place in > the user manual (or other literature) where I could find an explanation?
In the Application Developer's Guide, you'll want to look at the differences between "discrete" and "continuous" processes.
Multiple scattering is an example of a _continuous_ process. Whatever trajectory the particle is following in a step, a continuous process integrates some kind of physics all the way along the step. A continuous process does not (cannot!) limit a step; it just applies its particular physics during the particle's travel, which has already been limited by some other discrete process.
Multiple scattering integrates all of the not-explicitly-modelled tiny deflections along the particle's path, and applies a net change of direction at the end. Ionization energy-loss is another example: it sums up samples from the Bethe-Bloch equation in tiny dx*(dE/dx) steps within a full G4Step, and applies that total delta-E at the end of the G4Step.
Does that help to clarify things?
-- Michael Kelsey
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