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Forum: Event and Track Management
Re: Question Conservation of energy for electrons from ionisation
Re: Feedback Re: Conservation of energy for electrons from ionisation (Gumplinger Peter)
Re: None Re: Conservation of energy for electrons from ionisation
Re: Disagree Re: Conservation of energy for electrons from ionisation (Gumplinger Peter)
Date: 28 Apr, 2012
From: Vladimir Ivanchenko <Vladimir Ivanchenko>

Hello,

"/tracking/verbose 6" includes printout with may digits. Alternatively one can modify G4SteppingVerbose - see $G4INSTALL/examples/extended/electromagnetic/TestEm3

VI

________________________________________
From: Gumplinger Peter [gum@triumf.ca]
Sent: 27 April 2012 23:21
To: eventtrackmanage-g4hn@slac.stanford.edu
Subject: Re: Conservation of energy for electrons from ionisation

*** Discussion title: Event and Track Management

Norbert,

Well,

> Ok, this sounds plausible. But in this step (#24) of the muon track, it
> doesn't lose 150MeV:
>
> Step#    X(mm)    Y(mm)    Z(mm) KinE(MeV)  dE(MeV) StepLeng TrackLeng  NextVolume ProcName
>    23     93.4     1.64     -462  1.87e+03     3.94     23.7  1.56e+03  DetSimBulk muIoni
>    24     93.4     1.66     -466  1.85e+03    0.876     4.17  1.57e+03  DetSimBulk muIoni
>    25     93.3     1.73     -477  1.85e+03     2.03       11  1.58e+03  DetSimBulk muIoni
>
> Due to the number representation one can only see +/-10MeV.

1.87e+03 -> 1.85e+03 (so the actually kin E change is ~20MeV)

> But if the
> secondary electron gets 14.8MeV, one should see that energy loss in the
> muon track, right?

Don't you see it? - I see it!

Anyway, I suggest you write the kin. Energy to the screen in your
SteppingAction with higher precision so we are not fooled by rounded
numbers.

Moreover, believe me, if energy was not conserved in G4 we'd have the
whole G4 user community crying foul! So, before you assume something so
radical, check your arguments first.

Peter

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