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Forum: Processes Involving Optical Photons
Re: None Optical photons and Shashlik calorimeter (Alessandro Berra)
Re: Feedback Re: Optical photons and Shashlik calorimeter (Gumplinger Peter)
Date: 10 Nov, 2015
From: Alessandro Berra <Alessandro Berra>

Hi Peter,

thank you very much for your help. I didn't think about the possibility to create SkinSurfaces on the volumes around the scintillator tiles because I feared that the surface has an order with respect to the crossed volumes. Instead you are telling me that a "ground" SkinSurface (for example) assigned to the fiber hole logical volume is seen in the same way by an optical photon crossing from the scintillator tile to the hole and vice-versa?

Regarding the piece of code you have posted me, I understood the logic behind it, but I am not sure where to put it: as far as I understood is a check performed every step, so I have to put it in my SteppingAction class?

I have another (hopefully) last question: at the moment I am using the following values for the ground surface: sigma_alpha=0.2, specular_lobe=0.3, backscatter=0.3, specular_spike=0.1 (lambertian should be calculated by difference and thus be equal to 0.3). I am wondering if I have to add also a "reflectivity" parameter to the ground surface. In principle I would say no (the surface is not painted) but I want to be sure.

Thank you again

Alessandro

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