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Forum: Particles
Re: Question gun/ion syntax and equilibrium charge (Robert Weller)
Date: 27 Jun, 2003
From: Vladimir Ivanchenko <Vladimir Ivanchenko>

On Thu, 26 Jun 2003, Bob Weller wrote:

> *** Discussion title: Particles
> Email replies to PublicHyperNews@slac.stanford.edu must include:
>   In-Reply-To: <"/particles/28"@geant4-hn.slac.stanford.edu>
>   Subject: ...change this to be about your reply.
> 
> Perhaps this is an old question, but I haven't found an answer. In
> playing with low energy ions (MeV and below), it appears that their
> range is strongly dependent upon the third parameter of the gun/ion
> command described as the ion's charge. Ions penetrating matter have
> equilibrium charge states dependent primarily upon their velocity don't
> they? And aren't ranges therefore relatively independent of the initial
> charge of the ion? What then precisely is this third argument? In an
> earlier posting to this forum, an example "gun/ion 26 56 26" was offered
> as a fully stripped iron nucleus. I don't think that the initial charge
> state should make much difference in the range if one of these ions
> hits, e.g. silicon, but my (admittedly limited) experience with Geant4
> seems to suggest that in the simulation it does. Can someone clarify
> this or point me to an earlier discussion? Thanks.
> 

Hi Bob,

You are correct about ion physics. However if you are using standard G4 EM 
physics, the ion effective change does not taken into account. In 
contrary, if one takes lowenergy package, then it is the case. 

So, if for ionisation of G4GenericIon the process G4hLowEnergyIonisation 
is used the results should be independent on initial change. Of course, 
you should take care that ion made at least few staeps not one.

VI

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1 More: Re: gun/ion syntax and equilibrium charge   (Bob Weller - 27 Jun, 2003)
(_ None: Re: gun/ion syntax and equilibrium charge   (Vladimir IVANTCHENKO - 01 Jul, 2003)
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