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Forum: Event and Track Management
Re: Question Problem with GetGlobalTime() / GetLocalTime() for optical photons (Paul Papacz)
Date: 23 Jul, 2009
From: Paul Papacz <Paul Papacz>

Dear Peter,

thank you for your answer and sorry for my delayed reply.

> Do you have a normal dispersive medium (n monotonously increases with 
> frequency) for WLSFiberCore?

The fiber core has one and the same refractive index for all photon energies (frequencies), n = 1.60. I only look at photons between 2 eV and 4 eV, so I don't care about dispersive properties.

> Geant4 calculates the group velocity and from this times are
> calculated/updated. If you have access to your G4 source, I suggest you debug
> G4Track::GetVelocity() and G4Transportation::AlongStepDoIt (deltaTime)

I have access to the G4 source, I am using Geant4 9.2.p01. I took a look into G4Track and G4Transportation and found a comment in G4Track:

// Fix GetVelocity (bug report #741) Horton-Smith Apr 14 2005

So I'm not sure if there is anything to fix anymore.

> (also read bug report: bug report #741 for an explanation of the method).

I would like to read it, but I don't know, where to find it....

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