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Keywords: rindex optical surface
Forum: Processes Involving Optical Photons
Date: 17 Mar, 2004
From: Gumplinger Peter <Gumplinger Peter>

In the UNIFIED model, the 'theFinish' option of either "polishedbackpainted" or "groundbackpainted" (notice, it says "BACKpainted") allows for the situation where a thin optical layer is between the physical volume and the reflective paint (or reflector) without having to specify this layer as a separate geometrical volume in the simulation. For example, if you have a Al wrapping tight around a volume (scintillator), there'll be a thin air layer. It is the index of refraction of this thin layer that the user specifies when he/she specifies the G4OpticalSurface for the volume.

G4OpSurface* OpSurface = new G4OpticalSurface("name"); OpSurface -> SetType(dielectric_dielectric); OpSurface -> SetModel(unified); OpSurface -> SetFinish(groundbackpainted);

const G4int NUM = 2;

G4double pp[NUM] = {2.038*eV, 4.144*eV}; G4double rindex[NUM] = {1.35, 1.40};

G4MaterialPropertiesTable* SMPT = new G4MaterialPropertiesTable();

SMPT -> AddProperty("RINDEX",pp,rindex,NUM); OpSurface -> SetMaterialPropertiesTable(SMPT);

For more explanation please look at:

http://wwwasd.web.cern.ch/wwwasd/geant4/G4UsersDocuments/UsersGuides/ForApplicationDeveloper/html/TrackingAndPhysics/physicsProcess.html#5.2.5

http://geant4.slac.stanford.edu/UsersWorkshop/G4Lectures/Peter/moisan.ps

Hope this helps,

Peter

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1 Question: Re: Optical Surface properties   (Vlasios Vasileiou - 18 Mar, 2004)
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