Re: [fluka-discuss]: Multi-step calculations as an extension of two-step one.

From: Stefan E. Mueller <>
Date: Mon, 2 May 2022 17:24:33 +0200 (CEST)

Dear Adam,

yes, I think this is possible. This entry in the Mailing list
gives an explanation how to dump a "collision file" and the attached
source.f-file shows how to read the file back in for the second step.

As is mentioned in the corresponding thread, it is important to keep track
of the weights of the particles in the collision file (and in general how
to transfer the normalization of the scored particles in the first step to
the second step when they are read back). Also, ideally in the first
step when you create the collision file, the available phase space should
be fully covered (eventually by using variance reduction techniques) in
order for the second step to be consistent.

Of course this precedure can be repeated, but with every iteration, making
sure the phase space is properly exhausted and the normalization is kept
consistent becomes more difficult in my opinion.



Stefan E. Mueller
Department of Information Services and Computing - Computational Science
and Institute of Radiation Physics
Helmholtz-Zentrum Dresden-Rossendorf
Tel: +49 (0351) 260 3847
Vorstand: Prof. Dr. Sebastian M. Schmidt, Dr. Diana Stiller
Vereinsregister: VR 1693 beim Amtsgericht Dresden
On Wed, 6 Apr 2022, wrote:
> Dear FLUKA experts.
> Is it possible to make calculate in such a way that I use the particles from
> the phase space file obtained in the first stage of the calculation as a
> source and save the result of the calculation as another phase space file so
> that they can be used again for the next stage of the calculation
> (extensions of procedure fluscw_TwoSteps.f and source_TwoSteps.f)?
> Best regards
> Adam
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Received on Mon May 02 2022 - 19:14:21 CEST

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