Reflectance of different mirrors and the corresponding photon yield for the plate radiator without lens.
![](/~rdzhigad/data/prt/o16/mirror_refl/hReflectivity.png)
With 0.1 mm air gap:
![](/~rdzhigad/data/prt/o16/mirror_refl/mirror_refl.png)
Without air gap:
![](/~rdzhigad/data/prt/o16/mirror_refl/mirror_refl_ng.png)
Geant4 screenshots of the reflections (from left to right: Al mirror, 0.1 mm air gap, radiator) (25 degree polar angle):
![](/~rdzhigad/data/prt/o16/mirror_refl/mirror_with_arigap.png)
![](/~rdzhigad/data/prt/o16/mirror_refl/mirror_with_arigap1.png)
![](/~rdzhigad/data/prt/o16/mirror_refl/mirror_with_arigap2.png)