RE: [fluka-discuss]: Number of ionizations in a region

From: Angelo Infantino <angeloinfa_at_hotmail.com>
Date: Mon, 18 Nov 2013 21:43:28 +0100

Thank you for the clarification Francesco!
Best

Angelo

> Date: Sun, 17 Nov 2013 12:15:03 +0100
> From: Francesco.Cerutti_at_cern.ch
> To: angeloinfa_at_hotmail.com
> CC: nikhil.nitk_at_gmail.com; fluka-discuss_at_fluka.org
> Subject: RE: [fluka-discuss]: Number of ionizations in a region
>
>
> Dear Angelo
>
> I'm afraid there is some basic misunderstanding:
>
> - FLUKA, as any condensed history code, is not at all designed to describe
> single ionization events releasing electrons below the delta ray
> threshold, which in FLUKA has a hard limit at 1 keV (still you need to
> lower it down from the default value). This means that you can ask the
> code to explicitly generate and transport electrons above 1keV (and
> scoring the generalized particle NET-CHRG you can get the charge variation
> in the space), but all other ionization losses are considered as
> continuous along the primary particle track and not as discrete events
> yielding electrons you can score. The associated piece of info you can get
> is just the energy deposition along the track.
>
> - tracklength [cm] density [cm-3] is the definition of fluence [cm-2]. As
> you score it on a regular USRBIN mesh, then you do not need at all the bin
> volume: this is known by the code and used to get tracklength density in a
> bin out of the tracklength calculation. If instead you score by region,
> then you will just get tracklength [cm] since the code does not know the
> region volume, as indicated by Vittorio.
>
> Ciao
>
> Francesco
>
> **************************************************
> Francesco Cerutti
> CERN-EN/STI
> CH-1211 Geneva 23
> Switzerland
> tel. ++41 22 7678962
> fax ++41 22 7668854
>
> On Fri, 15 Nov 2013, Angelo Infantino wrote:
>
> > Sorry,Little correction to my previous mail. Correct me if I am wrong.
> > The USRBIN calcualtes the particle tracks density right? So it needs the
> > volume to get particles/cm2/primary.
> > So the question is what volume is used? (not what surface!)
> > What about the region binning?
> > Thank you
> >
> > Angelo
> >
> >
> > ____________________________________________________________________________
> > From: angeloinfa_at_hotmail.com
> > To: nikhil.nitk_at_gmail.com
> > CC: fluka-discuss_at_fluka.org
> > Subject: RE: [fluka-discuss]: Number of ionizations in a region
> > Date: Fri, 15 Nov 2013 18:45:33 +0100
> >
> > Dear Nikhil,When I score particles with USRBIN I obtain a fluence/primary.
> > For example, if I filter with AUXSCORE only the ELECTRONS, with a XYZ mesh,
> > I obtain the #e/cm2/primary. Correct?
> > But what is the surface that the score use to normalize the result? The
> > surface of the bin that I created?
> > And what about the region scoring? I get the #e/primary in the whole region?
> > Last question: If I score charged particle, i.e. electrons, how I can say
> > that these electrons not came also from interactions of photons
> > (photoelectric effect, compton ecc) or other particles?
> > Thank you.
> >
> > Angelo
> >
> > ____________________________________________________________________________
> > Date: Fri, 15 Nov 2013 10:33:46 +0100
> > Subject: Re: [fluka-discuss]: Number of ionizations in a region
> > From: nikhil.nitk_at_gmail.com
> > To: angeloinfa_at_hotmail.com
> > CC: fluka-discuss_at_fluka.org
> >
> > Dear Angelo,
> > you can try scoring the charged particles and then normalize to the proton
> > current. For example, one can score different kinds of charged particles
> > using USRBIN.
> >
> > Cheers,
> > -Nikhil
> >
> >
> > On Thu, Nov 14, 2013 at 7:38 PM, Angelo Infantino <angeloinfa_at_hotmail.com>
> > wrote:
> > Dear Fluka experts,I'm trying to calculate the number of
> > ionizations given by a proton beam in a region. At the end I
> > want to get the current generated in uA (only by the primary
> > protons).
> > To figure out how to get this number I built a very simple geometry: A
> > proton beam (13 MeV pencil beam with no spread in energy and
> > direction) on a cylindrical target of copper, thick enough to stop
> > completly the beam. The target is surrounded by a region of vacuum and
> > blackhole. My goal is to score the current (in uA) generated by the
> > primary particles in the copper target.
> > Is it possible to do with the standard score of fluka?
> > Thank you in advance!
> >
> > Angelo
> >
> >
> >
> >
> >
> >
                                               
Received on Mon Nov 18 2013 - 22:31:40 CET