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Question Possibilities of simulating dynamic targets  

Forum: Geometry
Date: 27 Jun, 2014
From: Debasish Datta <Debasish Datta>

Initially I have posted my question in 'Physics List' forum but after Andrea's feedback and suggestion I am reposting it again here in 'Geometry'. The original question was:

Dear all,

I am quite a novice user of GEANT4 and trying to simulate the effect of energetic ion (with keV - MeV energy) impact on metal nanoparticles. In such cases, it is an well known fact that some atoms of the target materials (here, the nanoparticles) will be sputtered out and the target will get eroded. So my question is, can it be possible to incorporate the effect of such erosion and subsequent target modification in the GEANT simulation? In other words, I need to change the target composition and geometry slightly after each ion impact. Can I do that?

Thanking in anticipation.



And here was answer by Andrea Dotti :


this is more a question related to geometry than physics. I suggest you to follow the geometry related forum. Can you please re-post your question (and my answer here) there?

In G4 it is possible to simulate "moving" geometry. In your specific case mass/shape change. There are two techniques for that: 1- You are free to modify geometry between runs. You can simulate a short run with few particles, modify the geometry do a second run and so on 2- Use parametrized volumes to recompute geometry based on event number.

Both techniques are covered in our tutorials in the advanced techniques for geometry. For example the most recent SLAC one covers the subject here:

Regards, Andrea


After getting his feedback, now I want to add another question:

In short...Is it possible to define the crystal structure (like Cubic, Face-centered cubic etc.) of the targets in Geant4?



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1 None: Re: Possibilities of simulating dynamic targets   (Marc Verderi - 27 Jun, 2014)
2 Feedback: Re: Possibilities of simulating dynamic targets   (Michael H. Kelsey - 27 Jun, 2014)
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