Cathode emitted current

I’m trying to simulate Spacecraft charging due to EP.

However, after a few simulation steps the net emitted current from the cathode tends to zero as well as the cathode current (since the recollected current is null).
This leads to a total current to the spacecraft equal in magnitude to the thruster emitted current, and to a potential of some nodes that reach the kV level.
How can I solve this problem?

Also, I noticed that the cathode net emitted current tends to zero when the emitted particles reach the boundary. Can this be related?


Hello Davide,
could you provide some details about the kind of simulation? Is your thruster aboard a spacecraft or in a test chamber, what kind of cathode electron distribution and the boundary conditions?