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Keywords: optical photons reflectivity transmission surfaces
Forum: Geometry
Re: Question surface with 98% reflection and 2% transmission of optical photons (Matthew)
Re: Feedback Re: surface with 98% reflection and 2% transmission of optical photons (Gumplinger Peter)
Date: 08 Apr, 2008
From: Matthew <mablackston@gmail.com>

Thanks for your reply Peter!

I finally got around to downloading another copy of GEANT 
so that I could modify the source code as you suggested. The 
photons that reflect behave as they ought, but the ones that 
are supposed to transmit have a problem.  They disappear and 
this is the error message I get:

  G4ParticleChange::CheckIt  : the Momentum Change is not unit vector !!
  Difference:  1
 G4ParticleChange::CheckIt 
      -----------------------------------------------
        G4ParticleChange Information  
      -----------------------------------------------
        # of 2ndaries       :                    0
      -----------------------------------------------
        Energy Deposit (MeV):                    0
        Non-ionizing Energy Deposit (MeV):                    0
        Track Status        :                Alive
        True Path Length (mm) :                 3.94
        Stepping Control      :                    0
        Mass (GeV)   :                    0
        Charge (eplus)   :                    0
        MagneticMoment   :                    0
                :  =                    0*[e hbar]/[2 m]
        Position - x (mm)   :            -3.61e-16
        Position - y (mm)   :               0.0325
        Position - z (mm)   :                -1.09
        Time (ns)           :               0.0131
        Proper Time (ns)    :                    0
        Momentum Direct - x :                    0
        Momentum Direct - y :                    0
        Momentum Direct - z :                    0
        Kinetic Energy (MeV):             3.35e-06
        Polarization - x    :                    0
        Polarization - y    :                    0
        Polarization - z    :                    0

*** G4Exception : 200
      issued by : G4ParticleChange::CheckIt
momentum, energy, and/or time was illegal
*** Event Must Be Aborted 

Any ideas about how to fix this?

Matthew

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1 Idea: Re: surface with 98% reflection and 2% transmission of optical photons   (Peter Gumplinger - 10 Apr, 2008)
(_ Feedback: Re: surface with 98% reflection and 2% transmission of optical photons   (Matthew - 14 Apr, 2008)
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