Helical wave ion source beam divergence control system

The invention relates to the technical field of spaceflight space electric propulsion, in particular to a spiral wave ion source beam divergence control system which comprises a discharge chamber, a fixed support, an electromagnetic coil, an antenna, an air supply device, an arc-shaped curved surface grid mesh and a magnetic expansion horn mouth, and the discharge chamber is arranged on the fixed support through a first supporting frame; the electromagnetic coil integrally surrounds and sleeves the outer wall of the discharge chamber; the antenna is arranged on the outer wall of the discharge chamber in a surrounding and sleeving manner; the gas supply device is arranged on the fixed bracket through a second support frame and is connected with the inlet end of the discharge chamber; the arc-shaped curved surface grid mesh is arranged on the fixed bracket through a third support frame and integrally covers the outlet end of the discharge chamber; the magnetic expansion horn mouth is arranged on the fixing supp