Re: [fluka-discuss]: importances Portland concrete

From: Francesco Cerutti <>
Date: Fri, 17 May 2019 07:41:18 +0200

Date: Thu, 16 May 2019 21:41:19 +0200 (CEST)
To: Moritz Ganter <>
Cc: FLUKA discussion <>

Dear Moritz,

well, 3 days are still not an unsustainable running time...

Nevertheless, you can try to assign increasing region importances to the deeper
layers through the card BIASING applied to your low energy neutrons. I do not
know your geometry, but in case the concrete layers correspond to concentric
spheres, I'd profit from the full isotropy of the problem to bias only a
fraction of the whole solid angle and get there a better convergence.

Good luck


Francesco Cerutti
CH-1211 Geneva 23
tel. +41 22 7678962

On Mon, 13 May 2019, Moritz Ganter wrote:

> Hello everybody :)
> I am new to FLUKA so i have some questions.
> Currently i have to simulate 7 layers of Portland concrete. Every layer has
> its own usertrack to detect
> the measurements.
> My Beam is an isotropic NEUTRON radiation source, is 35cm away from the first
> layer of concrete and has
> energies ranging from 1E-2GeV to 1E-12GeV.
> May last usertrack shows errors above 5% and i need to get it below.
> After running on 1300000000 particles i finally managed to get it under 5%,
> but it took me 3 days to run.
> How can i set importances to the layers (or usertracks?) using biasing to get
> the same results in less
> time? Couldn't get it to work properly.
> Thank you in Advance
> Moritz Ganter

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Received on Fri May 17 2019 - 09:21:50 CEST

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