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Forum: Processes Involving Optical Photons
Re: Question Reflectivity of dielectric_metal border (Thomas Bonnet)
Re: Feedback Re: Reflectivity of dielectric_metal border (Gumplinger Peter)
Date: 26 Mar, 2015
From: Thomas Bonnet <Thomas Bonnet>

Hello Peter, Thank you for your helpful suggestions.

I'm using geant4.10.00.

Following your advice, I specified two energies for the properties: RINDEX, ABSLENGTH, etc and I also activated verbosity for G4OpBoundaryProcess.

for a reflectivity of 0. of opSurface I get :

*********************************************************************************************************
* G4Track Information:   Particle = opticalphoton,   Track ID = 97,   Parent ID = 4
*********************************************************************************************************

Step#      X         Y         Z        KineE    dEStep   StepLeng  TrakLeng    Volume     Process
    0  4.05 cm   34.8 cm  -16.7 cm   4.83 eV      0 eV      0 fm      0 fm   Scintillateur    initStep
 Photon at Boundary! 
 thePrePV:  Scintillateur
 thePostPV: VolumeDetection
 Old Momentum Direction: (-0.969509,-0.189626,-0.155225)
 Old Polarization:       (0.230004,-0.485553,-0.843408)
 New Momentum Direction: (-0.969509,-0.189626,-0.155225)
 New Polarization:       (0.230004,-0.485553,-0.843408)
 *** Absorption *** 
    1-93.34 cm   15.7 cm -32.26 cm  4.828 eV      0 eV  1.005 m   1.005 m    Scintillateur  Transportation

It looks OK : as the photon is not reflected it is absorbed by the surface.

Then for a reflectivity of 1. of opSurface I get :

*********************************************************************************************************
* G4Track Information:   Particle = opticalphoton,   Track ID = 206,   Parent ID = 2
*********************************************************************************************************

Step#      X         Y         Z        KineE    dEStep   StepLeng  TrakLeng    Volume     Process
    0  10.1 cm   22.4 cm  -11.6 cm    2.6 eV      0 eV      0 fm      0 fm   Scintillateur    initStep
 Photon at Boundary! 
 thePrePV:  Scintillateur
 thePostPV: VolumeDetection
 Old Momentum Direction: (-0.343911,-0.915578,0.20843)
 Old Polarization:       (-0.931472,0.304587,-0.198966)
 New Momentum Direction: (0.533123,0.232871,0.813358)
 New Polarization:       (0.0368192,0.954076,-0.297293)
 *** LobeReflection *** 
    1-33.34 cm -93.12 cm  14.71 cm  2.604 eV      0 eV  1.262 m   1.262 m    Scintillateur  Transportation
 Photon at Boundary! 
 thePrePV:  VolumeDetection
 thePostPV: Scintillateur
 *** StepTooSmall *** 
    2-33.34 cm -93.12 cm  14.71 cm  2.604 eV      0 eV      0 fm  1.262 m    VolumeDetection  Transportation

In that case, I'm not so sure the output is good. What does StepTooSmall mean? After the LobeReflection the photon should keep travelling in the volume Scintillateur?

Regards. Thomas.

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1 Feedback: Re: Reflectivity of dielectric_metal border   (Gumplinger Peter - 26 Mar, 2015)
(_ None: Re: Reflectivity of dielectric_metal border   (Thomas Bonnet - 27 Mar, 2015)
(_ None: Re: Reflectivity of dielectric_metal border   (Gumplinger Peter - 27 Mar, 2015)
(_ None: Re: Reflectivity of dielectric_metal border   (Thomas Bonnet - 13 Apr, 2015)
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