|Message: OP border surface properties||Not Logged In (login)|
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I am simulating a cuboid scintillator (unpolished) wrapped with teflon as reflector (on five sides of the scintillator) with an air-gap (about 650 nm) between scintillator and teflon. The "free" side of the scintillator is paced on a detector.
My questions are: What is the best way to simulate the unpolished scintillator, air-gap and teflon surfaces? Is the way I am doing this the right one (see below)? If there are more than one solution, what is the best one and why? Is it necessary to simulate the air-gap explicit when I am using the LUT? Is it necessary to define the specular lobe constant, specular spike constant, backscatter spike constant and diffuse lobe constant for "G4OpticalSurface * surface_air_scint, unified model"?
// defined material properties: reflectivity teflon refractive index air and scintillator absorption length scintillator scintillator properties (light yield, emission intensity, ...) //
G4OpticalSurface * surface_air_scint = new G4OpticalSurface("DielectricSurface");
surface_air_scint -> SetType(dielectric_dielectric); //refractive index air = 1;, scintillator = ...,...,...; surface_air_scint -> SetFinish(ground); surface_air_scint -> SetModel(unified); surface_air_scint -> SetSigmaAlpha(0.8);
G4OpticalSurface * surface_array = new G4OpticalSurface("ArraySurface");
surface_array -> SetType(dielectric_LUT); //reflectivity teflon = 99% surface_array -> SetFinish(polishedteflonair); surface_array -> SetModel(LUT);
. . . new G4LogicalBorderSurface("ScintAirSurface1", physical_airgap_scint, physical_scintillator, surface_air_scint); new G4LogicalBorderSurface("ScintAirSurface2", physical_scintillator, physical_airgap_scint, surface_air_scint); new G4LogicalBorderSurface("ArrayAirSurface1", physical_array, physical_airgap_scint, surface_array); new G4LogicalBorderSurface("ArrayAirSurface2", physical_airgap_scint, physical_array, surface_array);
Thanks for your help in advance. Best regards Michael