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Feedback Re: coupling an optical G4Tubs to an optical G4Torus 

Keywords: optical photon G4Torus coupling
Forum: Processes Involving Optical Photons
Date: 07 Nov, 2006
From: Gumplinger Peter <Gumplinger Peter>

Hi Benton,

Thanks for your interesting posting.

> Does anyone have any experience coupling a G4Tubs to a G4Torus?

No, but this is certainly something that needs to work.

> Has anyone worked with optical photon transport in curved fibers?

Again, I haven't and I don't know who has?

I have a couple suggestions: Have you specified the index of refraction to be exactly the same for both fibers, the G4Tubs and the G4Torus? Specify a constant over the range of wavelength and the same for both. If so, the photons should certainly go into the G4Torus (I assume they have the same diameter). Have you tried to visualize where the photons get lost and/or have you turned /tracking/verbose on?

We can discuss this off-line (, maybe, until we find a resolution and then post it here again. It could well also be a 'geometry problem'. The G4Torus must return the correct normal for every place a photon bounces.


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