Re: [fluka-discuss]: Number of particles to be followed

From: Anna Ferrari <>
Date: Tue, 27 Apr 2021 16:16:45 +0200

Dear Sofia,
   the maximum number of primary histories in your run is set through the
entry what(1) in the card START.

   The value that you read in the .out file:

> Maximum number of beam particles to be followed: 20000

   means that you should have written what(1)=20000 in the input, and not
100000... please check this. 
Best regards,

Am Mon, 26 Apr 2021 16:27:46 +0200 schrieb Sofia Colombi :
>Dear FLUKA experts, I'm experiencing a limit in the maximum number of beam particles to be followed in each run. Specifically, I'm trying to run 10 cycles with 100000 primaries each, but at the end all the _fort.nn generated files contain only 20000 events.
>If I look into the .out files, I can read the following termination conditions, which seems to me the responsible for the 20000 events limit:
> === Termination conditions: === Maximum cpu-time allocated for this run: 100000000000000000.00 sec
> Minimum cpu-time reserved for output:                 10000.00 sec
> Maximum number of beam particles to be followed:         20000
> Maximum number of stars to be generated:              infinite
>Do you know why I'm experiencing such a limit? Is there a way to increase this number of particles to be followed?
>Thank you for your help,
Dr. Anna Ferrari
Institute of Radiation Physics, High Energy Density Division
Helmholtz-Zentrum Dresden-Rossendorf e.V.
Bautzner Landstraße 400, D-01328 Dresden
Tel. +49 351 260 2872

Vorstand: Prof. Dr. Sebastian M. Schmidt, Dr. Ulrich Breuer
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Received on Tue Apr 27 2021 - 17:55:59 CEST

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