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Forum: Fast Simulation, Transportation & Others
Re: Question Transportation deposits energy? (Scott Zelakiewicz)
Re: None Re: Transportation deposits energy? (Vladimir Ivantchenko )
Re: Note Re: Transportation deposits energy? (John Apostolakis)
Re: None Re: Transportation deposits energy? (Samir Banik)
Date: 24 Mar, 2017
From: John Apostolakis <John Apostolakis>

Dear Samir,

It is the ionisation process which is depositing the energy.  It occurs 
in any step, even if it is not the process which determined the step 
size  (it only limits the step if a delta electron above the current 
production threshold is emitted.)

In all steps of a charged particle the ionisation process has what is 
called an "along step" action in Geant4 which deposits energy that 
corresponds to the energy of delta electrons which have been produced, 
but fall below the production threshold - this is standard practice in 
Type II particle transport algorithms (Berger).   Please refer to the 
Physics Reference manual for further details and for references.

The transportation process simply limits the step at a boundary in some 
steps, including the one which you observed.

Best regards,

John


On 24/03/17 10:39, Samir Banik wrote:
> *** Discussion title: Fast Simulation, Transportation & Others
>
> I have defined a geometry of cylindrical shape with diameter 7.6cm and
> height 2.5 cm. There is no electric field. When I am passing particles
> through the detector I still see energy loss through the process
> transportation. I use
> "step->GetPostStepPoint()->GetProcessDefinedStep()->GetProcessName()" to
> print the process name in a step. Can anyone please answer why GEANT is
> showing energy deposition in Transportation when there is no electric
> field?
>
> Regards, Samir Banik
>
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