Failing to get ion-current in a microwave plasma

Hello,
I am using the plasma module mwp in 4.3b. Microwave heated Plasma.
Within this microwave plasma , I want to have a sample on DC bias..
This all looks nice.. but I am not sure I get current out of it?
starting from the library model, adding a metal boundary into the plasma region downstream.
setting its boundary to terminal (applying voltage to it.)
you can only charge it.
adding some circuit, should help.. but even there I have no luck..

the "inplane...where is the current" takes 31 minutes here on a i7..

I have Ion-current and e-current in the mwp.module, but nothing what would flow into the circuit..

why?

Help.

thanks,
Lukas