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Question Generic Ion Particle Track and Energy Deposited 

Forum: Event and Track Management
Date: 25 Mar, 2018
From: Lakshan Ram <Lakshan Ram>

Hello,

 I am simulating an Ar ion particle track in a TPC filled with Ar gas at 1 atm and 293.15 K. 
I have two queries regarding the particle track and the ionizing energy deposited by it. 
I generate the Ar ion using Particle Gun and set an energy of 100 keV in the (1, 0, 0) direction. 
I am using geant4.10.02.p03

1. The Tracks in the XY direction from 1000 simulation is shown in the first attached file (units in um). The track is unperturbed for an initial 54 um and then scatters as expected. I have looked at about 10 individual tracks and they appear to behave the same way. Even when I reduce the pressure of the gas to 0.05 atm, the length of the initial track remains exactly the same at 54 um. I am not sure what is causing this. For Generic Ion, I have Multiple Scattering and ionIonisation active.

2. At every step of the Ion, I calculate the the ionized energy deposited by taking the difference of GetTotalEnergy() and GetNonIonizingEnergy(). Taking this information from 1000 tracks, I get the second attached file (Units in keV). There is an abnormal offset between energies 0.62 to 0.71 keV. I can't think of any natural reasons why this might happen and suspect it is a geant4 effect.

Any help is much appreciated.

Thanks in advance for your time, Lakshan

   Attachment:
      http://hypernews.slac.stanford.edu/HyperNews/geant4/get/AUX/2018/03/25/01.16-13613-est13_1000Ev_ActXY_um.JPG
      http://hypernews.slac.stanford.edu/HyperNews/geant4/get/AUX/2018/03/25/01.16-87700-13_1000Ev_IonEdep_keV.JPG

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1 Idea: Re: Generic Ion Particle Track and Energy Deposited   (Vladimir Ivanchenko - 28 Mar, 2018)
(_ Ok: Re: Generic Ion Particle Track and Energy Deposited   (Lakshan Ram - 28 Mar, 2018)
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