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Forum: Physics List
Re: None WARNING! G4VEnergyLossProcess::AlongStepDoIt
Date: 13 Feb, 2006
From: Vladimir IVANTCHENKO <vnivanch@mail.cern.ch>

On Mon, 13 Feb 2006 markus.stockner@cern.ch wrote:

> *** Discussion title: Physics List
> Email replies to PublicHyperNews@slac.stanford.edu must include:
>   In-Reply-To: <"/phys-list/211"@geant4-hn.slac.stanford.edu>
>   Subject: ...change this to be about your reply.
> 
> Hello,
> 
> I recently changed from geant4.7.0.p01 to geant4.8.0 and afterwards to
> geant4.8.0.p01 and get now this warnings:
> 
> WARNING! G4VEnergyLossProcess::AlongStepDoIt: x= -1.4441912e-19 for
> eScaled(MeV)= 0.3186098 step(mm)= 0.0096516242 for triton
> 
> WARNING! G4VEnergyLossProcess::AlongStepDoIt: x= -1.921706e-20 for
> eScaled(MeV)= 0.043673504 step(mm)= 0.00089614382 for alpha
> 
> WARNING! G4VEnergyLossProcess::AlongStepDoIt: x= -2.1969917e-21 for
> eScaled(MeV)= 0.0014779388 step(mm)= 0.00023627346 for Al27[0.0]
> 
> WARNING! G4VEnergyLossProcess::AlongStepDoIt: x= -8.404155e-22 for
> eScaled(MeV)= 0.0031018672 step(mm)= 0.00018903168 for Fe56[0.0]
> 
> WARNING! G4VEnergyLossProcess::AlongStepDoIt: x= -2.0100489e-22 for
> eScaled(MeV)= 0.00033264104 step(mm)= 5.5009263e-05 for Cr52[0.0]
> 
> WARNING! G4VEnergyLossProcess::AlongStepDoIt: x= -4.8111471e-19 for
> eScaled(MeV)= 0.72898331 step(mm)= 0.009190808 for alpha
> 
> does anybody know if that effects the result of the simulation and/or if
> it is possible to get ride of it?
> 
> Thanks in advance, Markus
> 

Hello Markus,

This warning was never reported before. Fortunatelly/unfortunatelly it is 
not controlled by verbosity level. The warning show us that there is a 
precision loss for calculation of energy loss of very slow ions at very 
small steps. How you get these results? What are the 
geometry/cuts/material/PhysicsList?

My first guess is that no real effect on your results unless you are 
studying slow ions.

VI

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1 None: Re: WARNING! G4VEnergyLossProcess::AlongStepDoIt   (markus.stockner@cern.ch - 13 Feb, 2006)
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