|Message: Re: Partially charged ions||Not Logged In (login)|
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On Tue, 17 Apr 2007, Jean Claude Thiry wrote: > *** Discussion title: Particles > Email replies to PublicHyperNews@slac.stanford.edu must include: > In-Reply-To: <"/particles/327"@geant4-hn.slac.stanford.edu> > Subject: ...change this to be about your reply. > > Hi, > > I'm a Geant newbie and I've got some problems defining a partially > ionized ion. In fact I want to shoot a Zirconium particle, charged +20 > in an ionization chamber. > > The problem is that I don't succeed in defining the ion: > particleGun->SetParticleDefinition(ionTable->GetIon(40,91,0,20)); should > shoot ions with charge +20, but apparently it doesn't... > > The only other way I see to set the charge is using a > G4DynamicalParticle, but in this case the particleGun won't accept that > particle as it's not a G4ParticleDefinition... > > What can I do to solve this problem? > > Regards > > Jean Claude Thiry > Hello, For today unfortunatelly we have the only approach - effective charge, which means that we force charge of an ion to be equal to its mean value depending on its velocity, assuming charge equilibrium between ion and media. We know that it is limiting a possibility to describe beams in vacuum or low dense materials and plan to change the situation but not earlier than at the end of the year. VI
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