Charged particle tracing, parameters influencing Collision number

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Hi all, I have been simulating charged particle tracing through air, under the influence of both fluid flow and potential difference. I came across a problem with size of particle, so I was wondering if size of particle released matter in the collision or trajectory when collision cross section, background number density, particle mass, charge etc are already defined.

I also faced another problem were the required time step for detecting all the collisions and that of observing complete trajectory differs in large order. Which make me almost impossible to observe both in single simulation. Is there any way to solve this?


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