Dear Zhefu,
you are almost there. You have a 70keV/n beam and by default, with
PRECISIO, you get a 25keV/n transport threshold, so your beam falls below
threshold pretty early generating the flat profile artefact related to the
single ranging out step below threshold.
Please lower the ion transport threshold down to the 250eV/n hard limit,
through a PART-THR card setting 1keV for alpha particles (total kinetic
energy corresponding to 250eV/n):
PART-THR -1E-06 4-HELIUM
The minus sign corresponds to kinetic energy selection.
Note that ions with A>4 are automatically given the same threshold (in
terms of kinetic energy per nucleon) as alphas.
This way you will eventually obtain the expected range.
But of course you will not see any Bragg peak, since your beam energy is
so low as to lie in an interval where the stopping power increases (not
decreases) with energy.
Best regards
Francesco
**************************************************
Francesco Cerutti
CERN-EN/STI
CH-1211 Geneva 23
Switzerland
tel. ++41 22 7678962
fax ++41 22 7668854
On Wed, 18 May 2016, lzfneu wrote:
> Thanks for your reply.
> Although i make a correction (Heavy Ion in beam card) in the beam card, the
> results still seems wrong.
> The bragg peak should be 1.07um.I wonder how to cope with this problem.
> here's the curve:
> [IMAGE]
>
>
>
> Could you please help me and thanks in advance.
>
> Zhefu
>
> > From: r.s.augusto_at_cern.ch
> > To: lzfneu_at_live.com; fluka-discuss_at_fluka.org
> > Subject: RE:Question about bragg peak of Ar ion
> > Date: Wed, 18 May 2016 09:07:06 +0000
> >
> > Dear Zhefu,
> >
> > If you want an Ar beam you should not use PROTON as beam, but Heavy Ion
> instead.
> >
> > Best regards
> >
> > ________________________________
> > //Ricardo dos Santos Augusto
> > CERN-EN/STI
> > Office: 864-02-D01
> > Phone: +41227675127
> > CH-1211 Genève 23, Switzerland//
> >
> > ________________________________________
> > De : lzfneu [lzfneu_at_live.com]
> > Envoyé : mercredi 18 mai 2016 7:10
> > À : fluka-discuss_at_fluka.org; Ricardo Manuel Dos Santos Augusto; Luigi
> Salvatore Esposito; neu lzf
> > Objet : Question about bragg peak of Ar ion
> >
> > Dear all,
> >
> > Thanks for your reply! my previous problem has solved.
> >
> > However, I meet another problem in calculating 70KeV Ar ion inject into
> Nd2Fe14B with FLUKA.
> >
> > The bragg peak should be 1.07um, but there is no bragg peak exist in the
> picture shown below calculated with FLUKA, i don't know what is wrong with
> my input:
> >
> >
> > [cid:inlineImage1]
> >
> >
> >
> >
> > I have attatched the input files in the attatchment.
> >
> > Any help will be appreciated and thanks in advance.
> >
> > Zhefu
> >
>
>
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Received on Wed May 18 2016 - 18:58:40 CEST