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Forum: Event and Track Management
Date: 16 Aug, 2011
From: Leif Raedel <Leif Raedel>

Dear community,

first of all I am new to geant4 and would really appreciate your help.

I am simulating muon propagation through ice. I would like to study the length of tracks and their angle relative to the muon direction (z direction). I attached a sketch (angle_steplength.jpg). The problem I have is that if I histogramm the track length as a function of alpha I find an edge at roughly 60 degrees.

G4bool IceBlockSD::ProcessHits(G4Step* aStep,G4TouchableHistory* /*ROhist*/)
{
  G4ThreeVector  momentumC =  aStep->GetPreStepPoint()->GetMomentumDirection();
  G4double TheAlpha = momentumC.theta();
  G4double stepl = aStep->GetStepLength();
  ...
}

This is the part of my code I use to get the track length and the angle. IceBlockSD is my own class derived from G4VSensitiveDetector.

If I exclude all angles from the first step of a track the edge vanishes. I added pictures for both cases.

I hope I added enough information.

Thanks in advance, Leif

   Attachment:
      http://hypernews.slac.stanford.edu/HyperNews/geant4/get/AUX/2011/08/16/05.37-73217-angle_steplength.jpg
      http://hypernews.slac.stanford.edu/HyperNews/geant4/get/AUX/2011/08/16/06.10-36717-alpha_length.png
      http://hypernews.slac.stanford.edu/HyperNews/geant4/get/AUX/2011/08/16/06.10-58014-pha_length_stepnb_cut.png

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1 Feedback: Re: angles and tracklengths of (secondary) particles   (Gumplinger Peter - 16 Aug, 2011)
(_ None: Re: angles and tracklengths of (secondary) particles   (Leif Raedel - 16 Aug, 2011)
(_ News: Re: angles and tracklengths of (secondary) particles   (Gumplinger Peter - 16 Aug, 2011)
(_ None: Re: angles and tracklengths of (secondary) particles   (Leif Raedel - 17 Aug, 2011)
(_ Feedback: Re: angles and tracklengths of (secondary) particles   (Gumplinger Peter - 17 Aug, 2011)
(_ None: Re: angles and tracklengths of (secondary) particles   (Leif Raedel - 18 Aug, 2011)
(_ Feedback: Re: angles and tracklengths of (secondary) particles   (Gumplinger Peter - 18 Aug, 2011)
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