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None Geant4 output 

Forum: Documentation and Examples
Date: 05 Nov, 2008
From: <janitor0405@126.com>

hi,everybody,
   I express my chamber filled with Xenon,when 662kev gamma comes in,I receive output file as follows:(just a part of it)
   ---> Begin of event: 0

*********************************************************************************************************
* G4Track Information:   Particle = gamma,   Track ID = 1,   Parent ID = 0
*********************************************************************************************************

Step#      X         Y         Z        KineE    dEStep   StepLeng  TrakLeng    Volume     Process
    0  -12.2 cm      0 fm      0 fm    662 keV     0 eV      0 fm      0 fm        World    initStep

 >>AlongStepDoIt (after all invocations):
    ++List of invoked processes 
      1) Transportation

    ++G4Step Information 
      Address of G4Track    : 0x8c234c8
      Step Length (mm)      : 67.91999999999997
      Energy Deposit (MeV)  : 0
      -----------------------------------------------------------------------
        StepPoint Information               PreStep            PostStep
      -----------------------------------------------------------------------
         Position - x (mm)   :              -121.92  -54.00000000000001
         Position - y (mm)   :                    0                   0
         Position - z (mm)   :                    0                   0
         Global Time (ns)    :                    0  0.2265567334585848
         Local Time (ns)     :                    0  0.2265567334585848
         Proper Time (ns)    :                    0                   0
         Momentum Direct - x :                    1                   1
         Momentum Direct - y :                    0                   0
         Momentum Direct - z :                    0                   0
         Momentum - x (MeV/c):                0.662               0.662
         Momentum - y (MeV/c):                    0                   0
         Momentum - z (MeV/c):                    0                   0
         Total Energy (MeV)  :                0.662               0.662
         Kinetic Energy (MeV):                0.662               0.662
         Velocity (mm/ns)    :           299.792458          299.792458
         Volume Name         :                World               World
         Safety (mm)         :                    0                   0
         Polarization - x    :                    0                   0
         Polarization - y    :                    0                   0
         Polarization - Z    :                    0                   0
         Weight              :                    1                   1
         Step Status         :            Undefined          Geom Limit
         Process defined Step:            Undefined      Transportation
      -----------------------------------------------------------------------

    ++List of secondaries generated (x,y,z,kE,t,PID):  No. of secodaries = 0

 **PostStepDoIt (after all invocations):
    ++List of invoked processes 
      1) Transportation
      2) compt (Forced)

    ++G4Step Information 
      Address of G4Track    : 0x8c234c8
      Step Length (mm)      : 67.91999999999997
      Energy Deposit (MeV)  : 0
      -----------------------------------------------------------------------
        StepPoint Information               PreStep            PostStep
      -----------------------------------------------------------------------
         Position - x (mm)   :              -121.92  -54.00000000000001
         Position - y (mm)   :                    0                   0
         Position - z (mm)   :                    0                   0
         Global Time (ns)    :                    0  0.2265567334585848
         Local Time (ns)     :                    0  0.2265567334585848
         Proper Time (ns)    :                    0                   0
         Momentum Direct - x :                    1                   1
         Momentum Direct - y :                    0                   0
         Momentum Direct - z :                    0                   0
         Momentum - x (MeV/c):                0.662               0.662
         Momentum - y (MeV/c):                    0                   0
         Momentum - z (MeV/c):                    0                   0
         Total Energy (MeV)  :                0.662               0.662
         Kinetic Energy (MeV):                0.662               0.662
         Velocity (mm/ns)    :           299.792458          299.792458
         Volume Name         :                World               Calor
         Safety (mm)         :                    0                   0
         Polarization - x    :                    0                   0
         Polarization - y    :                    0                   0
         Polarization - Z    :                    0                   0
         Weight              :                    1                   1
         Step Status         :            Undefined          Geom Limit
         Process defined Step:            Undefined      Transportation
      -----------------------------------------------------------------------

    ++List of secondaries generated (x,y,z,kE,t,PID):  No. of secodaries = 0
      [Note]Secondaries from AlongStepDoIt included.

#Step#      X         Y         Z        KineE    dEStep   StepLeng  TrakLeng    Volume     Process
    1   -5.4 cm      0 fm      0 fm    662 keV     0 eV   6.79 cm   6.79 cm        World  Transportation

   my problem is what is the difference between AlongStepDoIt (after all invocations) and PostStepDoIt (after all invocations),please tell me some details about it,thank you very much!

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1 Note: Re: Geant4 output   (John Apostolakis - 13 Jan, 2009)
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