RE: Problem with Compound/Material card

From: Stefan Roesler <sroesler_at_mail.cern.ch>
Date: Tue, 21 Oct 2008 18:04:50 +0200

Hi Ruan,

If Phi(k) is the flux in bin k the cumulative fluence Cum(k) is

    Cum(k) = sum_i=1..k [Phi(i) * (delta E)_i]

Thus, if only Phi(k) is non-zero all Cum(i) with i>=k must be equal.

Cheers
Stefan

On Tue, 21 Oct 2008, Steyn, Ruan <14593742_at_sun.ac.za> wrote:

> Hi Stefan
>
> I think you answered my question, thanks!
>
> But can you please elaborate, why I get the same value for the measure cumulative fluence. Maybe I don't understand the difference between the 2 quantities.
>
> Thanks
> Ruan
>
> ________________________________
>
> From: owner-fluka-discuss_at_mi.infn.it on behalf of Stefan Roesler
> Sent: Tue 2008/10/21 11:39 AM
> To: Steyn, Ruan <14593742_at_sun.ac.za>
> Cc: fluka-discuss_at_fluka.org
> Subject: Re: Problem with Compound/Material card
>
>
>
> Hi Ruan
>
> Your detector for the case with air shows only a non-zero fluence entry in
> one bin (the one which contains the beam energy)
>
> 50.14544 +/- 0.000000 % 0.000000 +/- 0.000000 %
>
> (if you run more particles you will also get entries at other energies)
>
> Note that the table following the differenial fluence is cumulative
> fluence, thus, values have to be identical since you add only zeros..
>
> Does this answer your question?
>
> Cheers
> Stefan
>
>
> On Mon, 20 Oct 2008, Steyn, Ruan <14593742_at_sun.ac.za> wrote:
>
> >
> > Hi Fluka users
> >
> > Someone detected a problem with the attached files of the previous =
> > Thus I am sending the same message to you.
> >
> > Thanks
> > Ruan
> >
> > Previous e-mail:
> >
> > Hi Fluka experts
> >
> > My question is related to the MATERIAL/COMPOUND card.
> >
> > In my example_mod.inp (attached) file - I made changes to the example
> > file (the one that comes with the fluka package).
> >
> > The changes that I made was: Target from BERYLLIC to AIR.
> > Beam from a Proton to Neutron and inserted the DEFAULT card for NEUTRONS
> >
> > Energy from 50GeV to 2 MeV
> >
> > I then compared the output file (fort 47 - Flux) of these 2 cases
> >
> > MATERIAL 4.0 9.0122 1.848 5.0 BERYLLIU
> > ASSIGNMAT BERYLLIU regBE3 regBE4
> > MATERIAL 0.001225 26.0 AIR
> > COMPOUND -0.0009256 7.0-0.0002837 8.0-0.0000157 18.AIR
> > ASSIGNMAT 26.0 regBE3 regBE4
> >
> >
> > I have attached the sum.lis file's for both these cases. For the first
> > case the name is beryllic_target_sum.lis and for the second one
> > with_air_sum.lis=20
> >
> > As you will see the output file look very differnent, as should be
> > expected. But the strange thing is that in the case of the air target
> > (with_air_sum.lis )the detector detected the same flux for all the
> > differnent bins. Can someone please explain this to me? Is there maybe
> > something wrong with my MATERIAL/COMPOUND card?
> >
> > Thanks
> >
> > Ruan
> >
> >
>
> --
> ___________________________________
>
> Stefan Roesler
> CERN, SC/RP
> CH-1211 Geneva 23
> Switzerland
>
> Phone: +41-22-7679891
> Fax: +41-22-7669639
> E-mail: Stefan.Roesler_at_cern.ch
>
>
>
>

-- 
___________________________________
Stefan Roesler
CERN, SC/RP
CH-1211 Geneva 23
Switzerland
Phone:  +41-22-7679891
Fax:    +41-22-7669639
E-mail: Stefan.Roesler_at_cern.ch
Received on Tue Oct 21 2008 - 18:29:34 CEST

This archive was generated by hypermail 2.2.0 : Tue Oct 21 2008 - 18:29:34 CEST