Optical Photon Processes in GEANT4 - Cern

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The assumption is that a roughsurface is a collection of ‘microfacets’16
Surface effectsPOLISHED: In the case where the surface between two bodies isperfectly polished, the normal used by the G4BoundaryProcess is thenormal to the surface defined by:(a) the daughter solid entered; or else(b) the solid being left behindGROUND: The incidence of a photon upon a rough surface requireschoosing the angle, a, between a ‘micro-facet’ normal and that of theaverage surface.The UNIFIED model assumes that the probability of micro-facetnormals populates the annulus of solid angle sin(a)da will beproportional to a gaussian of SigmaAlpha:theOpSurface -> SetSigmaAlpha(0.1);where sigma_alpha is in [rad]In the GLISUR model this is indicated by the value of polish; when it is SetPolish(0.0);The ‘facet normal’ is accepted if the refracted wave is stillinside the original volume.17
Page 1 and 2: Cover SheetOptical Photon Processes
Page 3 and 4: Optical photon productionin Geant4i
Page 5 and 6: Cerenkov Process• Cerenkov light
Page 7 and 8: User Options• Suspend primary par
Page 9 and 10: in ExptPhysicsList:#include “G4Sc
Page 11 and 12: G4Absorption• Bulk Absorption -
Page 13 and 14: G4BoundaryProcessImplementation Det
Page 15: G4OpticalSurface• Set the simulat
Page 19 and 20: Csl: Reflection prob. about the nor
Page 21 and 22: ExampleG4LogicalVolume * volume_log
Page 23 and 24: The logic in G4OpBoundaryProcess:Po
Page 25: ExampleN0625

Optical Photon Processes in GEANT4 - Cern

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