Matching 3D electrodes at their edges
Sometimes the edges of two neighbouring 3D electrodes (for example a disc at the end of a cylinder) might not match accurately -that is there might be gaps between them.
In fact such gaps have a negligible influence on the fields away from the electrodes, which is where the charged particles usually travel.
But here is some advice on how to remove these gaps, perhaps for ‘cosmetic’ reasons.
We take as an example a disc at the end of a cylinder. The most important action is to make sure that the disc and cylinder have the same number of subdivisions around the axis of symmetry. This is easy to achieve if the disc is the type that has a hole at the centre, but if it is a complete disc then the user should experiment with the total number of subdivisions. It might be necessary to replace a complete disc by a smaller complete disc surrounded by a disc with a hole.