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Keywords: magnetic field, low energy ion, GEANT4.7.0.p1, looping
Forum: Fields: Magnetic and Otherwise
Re: Question Problem with tracking low energy ions in magnetic field in GEANT 4.7.0.p.1 (Ilya)
Date: 22 Jan, 2006
From: John Apostolakis <John Apostolakis>

Dear Ilya,

I think that I have an idea what is causing your track to be seen always at z= 3.01 mm. I am confused, though, why the track shows no energy loss, and why it survives to go several meters in these volumes.

My guess is that z= -3.01 mm is the surface between your World and 'Surface Holder' modules. As the tracks spiraling in a helix, it encounters this surface repeatedly.

I cannot guess the direction of the field that you are applying from this track. Could you please let me know ? In case there is a problem could you also show how you assign it to the world or a particular volume ?

If you would like to see that the particle is progress, despite what the print-out appears to say, I suggest putting a step limit that is between 5 mm and 5 cm, globally or in the world volume. I think that you will see better the helix of the particle.

My main concern, though, is that this particle is not losing energy. If either of the volumes that it encounters has material other than vacuum I expect some energy loss, but none is seen.

I expect that this is because the ion does not have a good physics list. What physics list are you using for your program?

Best regards, John Apostolakis

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1 Feedback: Re: Problem with tracking low energy ions in magnetic field in GEANT 4.7.0.p.1   (Ilya - 25 Jan, 2006)
(_ None: Re: Seg. fault running a simple app with geant4-07-01   (Vladimir Ivanchenko - 27 Jan, 2006)
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