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Forum: Processes Involving Optical Photons
Re: None Boundary process and copies of the mother volume (Paola Marini)
Date: 13 Oct, 2010
From: Gumplinger Peter <Gumplinger Peter>

Hello Paola,

What you do seems perfectly correct. I understand you have a trapezoid mother volume into which you place two smaller trapezoids, one that'll be closer to the axis being the scintillator, and a thinner one that'll be the outside backing representing the teflon. Between the two of them they completely fill the volume of the mother. You then define a dielectric_metal boundary between two positioned volumes - a G4LogicalBorderSurface. In the definition of it you use the pointers to the positioned scintillator and teflon volumes (into their mother). It should now not matter how often you place the mother into the world. Every time a optical photons encounters a boundary between scintillator and teflon the surface should be recognized as dielectric_metal.

You have another option, you could define your whole mother as teflon and only place the scintillator in it. You then define the G4LogicalBorderSurface between the mother and the scintillator. That should work just the same. A photon leaving the scintillator but not seeing the teflon of the mother (because it simulataneously also leaves the mother) should not encounter the border surface and refract out in most cases.

Hope this helps, Peter

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1 None: Re: Boundary process and copies of the mother volume   (Paola Marini - 14 Oct, 2010)
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