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Question Problems for transportation of high energy optical photons 

Keywords: optical photon transportation OpAbsorption
Forum: Event and Track Management
Date: 11 Mar, 2008
From: Keito Horie <kate@rcnp.osaka-u.ac.jp>

Hello.

I would like to ask the treatment of photons which have the energy higher than 3.6 eV.(350nm) in GEANT4. I found that such a high energy “opticalphoton” cannot be transported in materials. Opticalphotons (> 3.6eV) were generated in G4MaterialPropertiesTable, and ABSLENGTH and RINDEX were also set. It is needless to say that low energy photons have no problem. High energy photons were once generated, but surely killed in the first step, which can be easily recognized by using G4UserSteppingAction. The following is the information which I encountered in the study of the above problem.

(1)PhysicsList:

G4Cerenkov, G4OpAbsorption, G4OpRayleigh, and G4OpBoundaryProcess were activated.

(2) ABSLENGTH parameter:

The situation was not changed if I used too exaggerated setting such as 1.e30m. In special case that I did not set ABSLENGTH by commenting out “myMPT->AddProperty("ABSLENGTH",PhotonEnergy, Absorption,nEntries);” in G4VUserDetectorConstruction, the photons were turned out to be not killed.

(3) materials:

The situation was not changed if I used Air, glass, and so on.

(4) Log message:

The following is log message displayed in “/tracking/verbose 1” mode. Message of

** Photon absorbed! **
    1   -2.3 mm  -80.1 um   65.4 um    3.8 eV      0 eV      0 fm      0 fm
  Layer3  OpAbsorption

was shown, indicating photons were surely killed by OpAbsorption.

Best regards, Keito Horie

 

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1 Feedback: Re: Problems for transportation of high energy optical photons   (Peter Gumplinger - 12 Mar, 2008)
(_ None: Re: Problems for transportation of high energy optical photons   (Keito Horie - 17 Mar, 2008)
(_ Disagree: Re: Problems for transportation of high energy optical photons   (Peter Gumplinger - 17 Mar, 2008)
(_ None: Re: Problems for transportation of high energy optical photons (solved.)   (Keito Horie - 18 Mar, 2008)
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