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Forum: Processes Involving Optical Photons
Re: Question WLS emission (Davit Mayilyan)
Re: Feedback Re: WLS emission (Gumplinger Peter)
Re: Feedback Re: WLS emission (Davit Mayilyan)
Date: 16 Sep, 2011
From: Gumplinger Peter <Gumplinger Peter>

Hi Davit,

Try this:

  const G4int nEntries = 6;
  G4double PhotonEnergy[nEntries] =
           {3.00*eV,3.01*eV,3.02*eV,3.98*eV,3.99*eV,4.00*eV};

  // for the scintillator
  G4double RefractiveIndex1[nEntries] = {six entries for the range 3-4eV};
  G4double Abslength[nEntries] = {six entries for the range 3-4eV}
  G4double ScintilFast[nEntries] = {0,0,0,0,1,1};

  // for the fiber
  G4double AbsWLSfiber[nEntries] = {large,large,large,short,short,short};
  G4double RefractiveIndex2[nEntries] = {six entries for the range 3-4eV};
  G4double EmissionFib[nEntries] = {1,1,0,0,0,0};

This will give scintillation light at 4eV (actually 3.98-4.00eV - but you must give a finite width for the line. Also note, the program interpolates between two bins and you therefore need to give a steep rise/fall - e.g. you need two extra bins).

This light will be readily absorbed in the fiber (AbsWLSfiber is 'short') and WLshifted light will be emitted at 3eV (again, acutally 3.00-3.02eV). This light, in turn, will not be readily absorbed by the fiber since the AbsWLSfiber is 'large'.

This code should not produce any warnings because all photons genertated by the program have a valid physics property; e.g. are within the range of PhotonEnergy array.

You can make the line sharper in steps of 0.01eV instead of 0.1eV if you are bothered by this. The exact wavelength/energy of the optical photons you create and absorb in your simulation is not so important except as optical properties change (like index of refraction, absorption length).

Please also note, optical photons in G4 are created and absorbed without energy conservation.

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1 Ok: Re: WLS emission   (Davit Mayilyan - 20 Sep, 2011)
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