Dear Jeremy
from your input file it appears that you are not giving any
DEFAULTS command.
In this case FLUKA adopts the default of default settings (the one
called NEW-DEFA, see the manual). With this setting, energy cuts
prevent to trasport particles below 1 MeV and you cannot define a
photon beam of 150 MeV. In this case FLUKA reacts in this way (I didn't
know that)
However the solution is simple: soon after the TITLE card put the command
DEFAUTS with PRECISIO in the SDUM and your beam energy will be
understood correctly.
That is not enough: you MUST specify proper production and transport
energy cuts for electrons and photons with the card EMFCUT (see the manual!)
(Remember that the PRECISIO settings use a 100 KeV cut-off, but this is
relative to particles different from photons and e+e- )
Best regards
Giuseppe Battistoni
On Fri, 9 Apr 2010, Jeremy Northum wrote:
>
> Hello All,
>
> I am having trouble getting FLUKA to give me the correct beam energy. I am
> trying to simulate a 150 keV x ray beam using
>
> BEAM -0.000150 0.0 0.0 0.0 0.0 1.0PHOTON
>
> When I look through the output file it appears as though the BEAM command
> was never read. When I look through the EVENTDAT output file I see
>
> Event # 1
> Primary Weight 1. Primary Energy 199.063934 GeV
>
> even though I specified an energy of 150 keV.
>
> Does anyone know what I am doing wrong?
>
> Thanks,
>
> Jeremy Northum
> Texas A&M University
Received on Fri Apr 09 2010 - 11:03:53 CEST
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