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Question Magnetic Field doesn't work when point source positioined at origin 

Keywords: GPS, Magnetic Field, Point Source at Origin, TestEm1, exgps
Forum: Fields: Magnetic and Otherwise
Date: 02 Jul, 2007
From: Matthew Middione <>

I am using the following two examples in Geant4 to model my simulation: TestEm1 and exgps

I have effectively created a hybrid model of the two to allow TestEm1 to use the GPS as opposed ot the ParticleGun. I did this so I could model a positron emitting point source.

I have a transverse magnetic field applied in the simulation as well and its strength can be changed. When I run the simulation with a 0.0 T magnetic field the calculated range of a 4 MeV positron is 2.0205 g/cm2. Then I apply a 9.4 T magnetic field expecting to see a significant reduction in the range of the same positron and the resulting range is 2.0279 g/cm2.

If I run the normal TestEm1 which does not utilize the GPS and instead uses the Particle Gun the results are what I expect. However, if I use the same example and change the location of the positron being emitted to the origin as opposed to the face of the detector, which was previously used, the results are consistent with what I first described above in the hybrid example. Basically there is the magnetic field takes no effect. What is causing this problem?

Any help would be much appreciated...

Thanks in anticipation, Matthew Middione

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