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Question Optical Photon Wave Length Shifting 

Forum: Processes Involving Optical Photons
Date: 13 Dec, 2010
From: Eric <Eric>

Hello-

I am working on a model of a scintillator that has an absorption/ re-emission characteristic. I implemented this according to example 5.7 here: http://geant4.web.cern.ch/geant4/UserDocumentation/UsersGuides/ForApplicationDeveloper/fo/BookForAppliDev.pdf

When I run my simulation, this is part of the result:

*********************************************************************************************************
* G4Track Information:   Particle = opticalphoton,   Track ID = 95,   Parent ID = 1
*********************************************************************************************************

Step#      X         Y         Z        KineE    dEStep   StepLeng  TrakLeng    Volume     Process
    0    8.2 mm  -9.18 mm  -3.24 mm   3.36 eV      0 eV      0 fm      0 fm   Scintillator    initStep
CYL_ST_SteppingVerbose::StepInfo() : verbose level = 1
    1   8.61 mm  -9.34 mm  -3.22 mm   3.36 eV      0 eV    438 um    438 um   Scintillator  Transportation
CYL_ST_SteppingVerbose::StepInfo() : verbose level = 1
    2   8.61 mm  -9.34 mm  -3.22 mm   3.36 eV      0 eV      0 fm    438 um        World  Transportation
CYL_ST_SteppingVerbose::StepInfo() : verbose level = 1
    3   2.15 mm   1.25 cm  -2.13 mm   3.36 eV      0 eV   2.28 cm   2.33 cm   Scintillator  Transportation
CYL_ST_SteppingVerbose::StepInfo() : verbose level = 1
    4   2.15 mm   1.25 cm  -2.13 mm   3.36 eV      0 eV      0 fm   2.33 cm        World  Transportation
CYL_ST_SteppingVerbose::StepInfo() : verbose level = 1
    5  -2.98 mm   5.44 mm  -1.72 mm   3.36 eV      0 eV   8.75 mm    3.2 cm   Scintillator       OpWLS

*********************************************************************************************************
* G4Track Information:   Particle = opticalphoton,   Track ID = 96,   Parent ID = 95
*********************************************************************************************************

Step#      X         Y         Z        KineE    dEStep   StepLeng  TrakLeng    Volume     Process
    0  -2.98 mm   5.44 mm  -1.72 mm   3.23 eV      0 eV      0 fm      0 fm   Scintillator    initStep
CYL_ST_SteppingVerbose::StepInfo() : verbose level = 1
    1  -8.37 mm   9.55 mm    781 um   3.23 eV      0 eV   7.22 mm   7.22 mm   Scintillator  Transportation
CYL_ST_SteppingVerbose::StepInfo() : verbose level = 1
    2  -8.37 mm   9.55 mm    781 um   3.23 eV      0 eV      0 fm   7.22 mm        World  Transportation
CYL_ST_SteppingVerbose::StepInfo() : verbose level = 1
    3   4.01 mm  -1.21 cm   9.96 mm   3.23 eV      0 eV   2.65 cm   3.38 cm   Scintillator  Transportation
CYL_ST_SteppingVerbose::StepInfo() : verbose level = 1
    4   4.01 mm  -1.21 cm   9.96 mm   3.23 eV      0 eV      0 fm   3.38 cm        World  Transportation
CYL_ST_SteppingVerbose::StepInfo() : verbose level = 1
    5    3.1 mm  -4.68 mm   1.27 cm   3.23 eV      0 eV   7.92 mm   4.17 cm   Scintillator  Transportation
CYL_ST_SteppingVerbose::StepInfo() : verbose level = 1
    6    3.1 mm  -4.68 mm   1.27 cm   3.23 eV      0 eV      0 fm   4.17 cm        World  Transportation
CYL_ST_SteppingVerbose::StepInfo() : verbose level = 1
    7   3.77 mm  -1.21 cm   1.19 cm   3.23 eV      0 eV   7.52 mm   4.92 cm   Scintillator  Transportation
CYL_ST_SteppingVerbose::StepInfo() : verbose level = 1
    8   3.77 mm  -1.21 cm   1.19 cm   3.23 eV      0 eV      0 fm   4.92 cm        World  Transportation
CYL_ST_SteppingVerbose::StepInfo() : verbose level = 1
    9  -8.43 mm    9.5 mm    9.3 mm   3.23 eV      0 eV    2.5 cm   7.42 cm   Scintillator  Transportation
CYL_ST_SteppingVerbose::StepInfo() : verbose level = 1
   10  -8.43 mm    9.5 mm    9.3 mm   3.23 eV      0 eV      0 fm   7.42 cm        World  Transportation
CYL_ST_SteppingVerbose::StepInfo() : verbose level = 1
   11    962 um   2.61 mm   8.08 mm   3.23 eV      0 eV   1.17 cm   8.59 cm   Scintillator       OpWLS

Notice that the last step in each is "OpWLS." I would expect that there would be two calls to this though, one for absorption and one for emission, so I find it odd that the particle ends there.

Does anyone have an explanation for this? Or a clue as to where I might be going wrong?

Thanks!

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1 Idea: Re: Optical Photon Wave Length Shifting   (Benton Pahlka - 14 Dec, 2010)
(_ Question: Re: Optical Photon Wave Length Shifting   (Eric - 16 Dec, 2010)
1 Disagree: Re: Optical Photon Wave Length Shifting   (Gumplinger Peter - 16 Dec, 2010)
1 Ok: Re: Optical Photon Wave Length Shifting   (Eric - 17 Dec, 2010)
... 1 Message(s)
2 Idea: Re: Optical Photon Wave Length Shifting   (Benton Pahlka - 17 Dec, 2010)
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