From: Marta Felcini (Marta.Felcini@cern.ch)
Date: Tue Jan 09 2007 - 19:42:09 CET
Hi Mary,
for most of the cases, to which a Monte Carlo such as FLUKA can be applied, the assumptions 1 and 2 are a very good approximation.
Namely, particles from a "typical" source do interact with each other, but their interaction is (usually) so weak that its effect can be neglected, for all practical purposes, as the Monte Carlo does.
Same is true with the particle histories: assuming that they do not perturb each other is indeed a very good approximation.
Special cases where one or both of the two assumptions are not valid necessitate dedicated Monte Carlo programs (eg beam particle transport codes take into account the interactions of particles in a very intense beam).
In summary, the applicability of a specific Monte Carlo code to solve your problem, depends on the problem you want to treat and the answer you want to get from the calculation.
If you are in doubt and have a specific problem to solve, please describe it and the questions you want to answer. In this way people on this list can tell you precisely if a code like FLUKA is applicable or not
Cheers,
Marta
________________________________
From: owner-fluka-discuss@fisica.unimi.it on behalf of me@marychin.org
Sent: Tue 1/9/2007 4:54 PM
To: fluka-discuss@fluka.org
Subject: particles in beam interacting with each other
Hi.
Could someone help me explain:
1. Presumably particles from a source don't interact with each other -
otherwise serial and independent computation of each radiation history,
as practiced in Monte Carlo simulations, wouldn't be valid. Why?
2. Presumably radiation histories do not perturb each other - otherwise,
as above, the way we do Monte Carlo simulations won't make sense. Why?
What specific principle / theory can I use to support statements such as
these?
Many thanks,
mary
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