Abstract
Mesh bias experiments, in which secondary electron emission from an endplate is suppressed, suggest that simple balance between an end loss electron current and an end loss ion current does not hold at the endplate. An ion current flowing into the endplate from its back side is observed, and a theoretical model is constructed which takes account of this current and secondary electrons emitted from the mesh wires. Mirror reflection of secondary electrons off an outer mirror throat is also considered in this model. The model includes the current balance and the endplate potential self-consistently. The current balance at the endplate is well accounted for by this model.
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