Message: Optical photon problem Not Logged In (login)
 Next-in-Thread Next-in-Thread
 Next-in-Forum Next-in-Forum

None Optical photon problem 

Forum: Particles
Date: 16 Jul, 2003
From: Phill Skelton <ps@ast.leeds.ac.uk>

I submitted a bug report on this about a week ago (#506), but have got no response so far, so I'm seeing if I get a reponse here.

I have a problem with the propogation of optical photons. They are produced by a particle gun, rather than a physics process, and have initial position, direction, energy and polarisation specified. They propogate through water in a spherical tank. For the first step (from the start point to either the first intersection with the walls (an optical surface) or a Rayleigh scattering event) they travel at the correct speed c/n (n = 1.33 is the refractive index). For all subsequent steps they travel at speed c / n2, n2 = 1.165. Is this due to setting something up incorretly, or some bug in Geant4 (using version 4.5.1 p01, compiled with g++ 3.2 under Linux Redhat 8.0).

A 600 line section of code that shows this problem is available if anyone is interested.

Inline Depth:
 1 1
 All All
Outline Depth:
 1 1
 2 2
 All All
Add message: (add)

 Add Message Add Message
to: "Optical photon problem"

 Subscribe Subscribe

This site runs SLAC HyperNews version 1.11-slac-98, derived from the original HyperNews


[ Geant 4 Home | Geant 4 HyperNews | Search | Request New Forum | Feedback ]