Re: missing room in FLUKA stack

From: Alberto Fasso' (Alberto.Fasso@cern.ch)
Date: Mon Mar 03 2003 - 13:17:33 CET


Hi,

that error message typically appears when the user sets a too small value
for the photon biasing factor for hadronic inelastic interactions
(WHAT(2) in option LAM-BIAS). That means that a too large number of
nuclear interactions takes place, and too many secondaries are created,
filling all the available space in the stack.
What is "a too small value" for the biasing factors depends on the problem,
and in particular on its photon energy range. In problems up to one
or two GeV, a factor 0.01 or 0.02 is acceptable, but in problems of the order
of several 100 GeV it is often impossible to work with factors < 0.05-0.1.

Try to increase that value, and you will see the message disappear.

     Alberto

On Mon, 3 Mar 2003, Hesti Wulandari wrote:

>
> Hi all,
>
> did any of you ever get the following fatal error message in an output
> file:
>
> Photonuclear interaction not performed because of missing room in FLUKA
> stack.
>
> Does it mean that FLUKA stack have no more room to store particles? And
> how can I solve the problem ?
>
> cheers,
> hesti
>
> -----------------------------------------------------------
> Hesti Wulandari
> Physikdepartment E-15
> Technische Universitaet Muenchen
> James-Franckstr.1
> 85748 Garching
> DEUTSCHLAND
> Ph. : ++49-89-28914416
> Fax : ++49-89-28912680
> e-mail: Hesti.Wulandari@ph.tum.de
> -----------------------------------------------------------

-- 
Alberto FassÚ
CERN-EP/AIP, CH-1211 Geneve 23 (Switzerland)
Phone: (41 22) 767 2398    Fax: (41 22) 767 9480   Alberto.Fasso@cern.ch


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