“…11 is interesijng to iiote thc cxperiinenial observations of 'Furchi, ct a1. [12], who 1 notiad that the currerll conlours inside Ihe MPD thrustcr can be drastically altered by simply changing the flow injection scheme, and that such a change had absolutely 110 effect on the terminal voltage, and most likely, no effect on the thruster efficiency.…”