Re: Fluka_neutron_fluence_always_zero

  Many thanks for attention.
  I tried your suggestion and it didn't give any results. I tried to play with
  parameters but without success . I still get zeroes for neutrons. For
  photons it works and always worked normally.
  If I ask you could you send me my input file with corrections already done
in it?

>
>
> On Wed, Feb 29, 2012 at 10:35 PM, Alberto Fasso' <fasso_at_slac.stanford.edu>
> wrote:
> Dear Vahan,
>
> to get neutrons and protons with an incident electron beam, you
> need to
> switch on photonuclear reactions in the materials present:
> PHOTONUC 1.0 0.0 0.0 OXYGEN COPPER
> And since photonuclear reactions have a very small cross section
> compared
> to other photon reactions, you need also to bias the photon
> hadronic
> mean free path:
> LAM-BIAS 0.0 0.02 1.0 PHOTON
>
> Look up these two commands in the manual to understand better
> how they
> are used.
>
> You say also that you cannot get photon fluence. Your input is
> set for protons,
> not photons, so the above explanation is valid.
> To calculate photon fluences, you cannot use USRCOLL: it can be
> used only for neutrons and hadrons. Use USRTRACK instead.
>
> Alberto
>
>
> On Tue, 28 Feb 2012, vahan petrosyan wrote:
>
>
> Hi I am a student and try to use Flair under XP with
> VirtualBox. I setuped
> it successfully but I have One problem.
> My example: Electron beam with 3Gev energy falls on
> COOPER target.
>
> Whatever I do, I changed electrons energy and
> particle number, I get always
> ZEROES in output for neutron or photon fluence.Why?
> Is it a bug or I did
> something wrong? I followed according flair
> documentation.
>
> I tried both USRCOLL and USRTRACK card without luck.
> I tried these cards for
> Photon fluence they worked. Problem with neutrons.
>
> I attached my input file. If you have a time could
> you take a look?
>
> If you help me I will be very appreciate.
> With regards V. Petrosyan
>
Received on Thu Mar 01 2012 - 22:48:57 CET