|Message: Energy-dependent refractive index not simulated properly||Not Logged In (login)|
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I'm finding a strange behaviour for optical photons propagating in a medium with refractive index dependent on the photon energy.
My optical photons have an energy of 7 eV and propagate in the medium with one step of 25 mm. The time it takes for each photon to cover the step is step->GetDeltaTime(), is that correct? If I multiply this time for the speed of light in vacuum and divide for the distance (25 mm) I expect to find the refractive index geant4 is using to propagate the photon, is that correct? I find the correct refractive index if I set it constant for every energy of the photons, but I find a wrong one if I specify a dependence on the energy.
Specifically, I'm defining the following values for RINDEX:
Energy (MeV) refr index
and I get n = 3.44, while I would expect something near 1.7. If I define RINDEX = 1.7 for every energy in that range, I obtain n = 1.7 from the time of the step.
I'm a bit puzzled, what could be going on?
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