Schematic diagram of the cylindrical Hall ion source with a magnetic field profile: (1) discharge channel; (2) cathode-outer magnetic pole; (3) annular anode; (4) permanent magnet; (5) cathode-inner magnetic pole; (6) inner shield; (7) outer shield; (8) back shunt.
Axial magnetic field strength distribution along the discharge channel axis as a function of distance from the inner magnetic pole surface.
Discharge current vs discharge voltage with four magnets.
Saturation ion beam current vs discharge current with different permanent magnets.
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