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Forum: Processes Involving Optical Photons
Re: Question help with reflection and refraction (Matt Worden)
Date: 03 Apr, 2009
From: Gumplinger Peter <Gumplinger Peter>

Hi Matt,

Yes, the simplest way to model your geometry at first is without defining a surface at all; you give only the index of refraction to your quartz and the water. What will be simulated is a perfectly smooth surface.

You are generating Cerenkov photons wrt to some particle direction and beta. These have very specific angles - you haven't shown your geometry - but I suspect that the angle with which they arrive on your surface result in total internal reflection. In this case, of course, there is no refraction.

You can print what reflection occurs with:

theBoundaryProcess->SetVerboseLevel(1);

in your PhysicsList.

If you were to make your surface rough, some photons will escape. Also, probably if you changed your incident particle's direction, some will escape. There is a physics reason why you don't get refraction.

Peter

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