Maybe that positive ion backflow disturbs the electric field, any other effects?
Yes. For more details please consult the relevant literature.
For these (and other) questions that rather address the physics and not the tecnicalities of the software, I think it is better you subscribe yourself to some gaseous detector school. DRD1 will organize a school end of this year. You can have a look at the slides of the previous school, organized by RD51 here:
or to some lecture series organized in the past by RD51 here:
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