[fluka-discuss]: Re: fluka-discuss low LET of proton

From: Francesco Cerutti <Francesco.Cerutti_at_cern.ch>
Date: Fri, 6 Sep 2013 16:47:36 +0200

Dear Ghazaleh,

one thing is to have a code still running in extreme conditions (e.g. a
condensed history Monte Carlo code at eV energies), a different thing is
to get in extreme conditions results still reliable. In particular, the
proton transport threshold in FLUKA cannot be less than 1keV (with
DEFAULTS PRECISIO it is set at 100keV, to lower it you need to issue a
dedicated PART-THR card), since the underneath physics assumptions are no
longer valid for energies approaching the atomic bindings.
I'm not sure what a 10keV proton "beam" corresponds to in reality, anyway
your BEAM card is setting indeed a 1keV (1.E-6 GeV) energy, implying that
- even with the as lowest as possible 1keV transport threshold - the
simulation ends immediately after a very tiny ranging out step actually
not making much sense.



Francesco Cerutti
CH-1211 Geneva 23
tel. ++41 22 7678962
fax ++41 22 7668854

On Wed, 4 Sep 2013, g.davarpanah_at_student.kgut.ac.ir wrote:

> Dear FLUKA users and Expers
> Hello
> I'm trying to simulate DNA damage due to proton by FLUKA.
> When the beam energy is in the Range of MeV, FLUKA produce output. For
> tracking DNA damage it needs to follow beam particle energy to KeV and eV
> too. As I know Geant4 can track energy to eV range. Can FLUKA track beam
> energy to eV? If yes how?
> And I want to define a beam of proton with 10KeV Energy but I don't know
> how define this energy in my Input file.
> I put PRECISIon in SDUM of Default card and beam card is:
> BEAM -1.E-6 0.0 0.0
> but it's not work.
> In advance, thank you for your help.
> Ghazaleh Davarpanah
Received on Sat Sep 07 2013 - 12:06:11 CEST

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