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Keywords: surface finish
Forum: Processes Involving Optical Photons
Date: 04 Feb, 2002
From: Gumplinger Peter <Gumplinger Peter>

I must apoligize for the fact that references which should be specified in the application developers guide:

http://wwwinfo.cern.ch/asd/geant4/G4UsersDocuments/UsersGuides/ForApplicationDeveloper/html/TrackingAndPhysics/physicsProcess.html#5.2.5

once were, but are now missing.

In the meantime, you can find much detailed information about the UNIFIED surface model at my URL:

http://www.triumf.ca/people/gum/moisan.ps

Is a frontpaint a paint directly applied on the solid surface (like a house paint)?

Yes.

2.Is a backpaint a reflector coating (some thin foil a few mircometers away from the actual volume surface)?

Yes; this spares you from having to specify the few micrometer thick coating as a separate GEANT volume for tracking. You specify the refractive index of the coat as part of the G4OpticalSurface. The reflections inside, or refractions back out this thin coat are all simulated within the G4OpBoundaryProcess and do not involve the G4Navigator.

Imagine I want to test two diferent kinds of surface finish:

A)Polished surface with a difuse reflector coating (e.g. carbon foil) a few micrometers apart from the polished surface.

B)Same as A) but with a specular reflector (e.g. aluminium).

This B) would be 'polishedbackpainted'; as for A) I'll have to check the code some more, but I am afraid, this may not be coded. The 'groundbackpainted' option seems to me to assume both the initial surface and the back paint to be difuse. I'll keep you posted.

Peter

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1 None: Re: Surface finish   (Gumplinger Peter - 11 Feb, 2002)
(_ Ok: Re: Surface finish   (Rui Bugalho de Moura - 12 Feb, 2002)
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