Compact plug connectable ion source

A compact ion source plug connected to a socket is provided. The source uses a magnetic pole piece which includes a center pole piece and a surrounding circumferential pole piece to form an arcuate fringe field. Cathode elements and anode elements are located within the fringe field for producing a plasma. A source body terminates at one end with at least one grid and forms a plasma chamber with a base member. All of the electrical connections to the plasma generator and the gas connection are through a plug formed on the opposite side of the base member