Patent ID: 8658986

Claim:
An ion source for an ion implanter comprising a housing defining an arc chamber, said housing having a pair of openings at one end thereof; a filament mounted in said arc chamber, said filament having a pair of legs extending through said openings of said housing; a clamp assembly mounting said legs of said filament therein in electrically conductive relation; a first repeller assembly mounted in said housing at second end opposite said filament and said one end; a second repeller assembly mounted in said housing at said one end, said second repeller assembly including a flat plate, a first sleeve of a predetermined inside diameter extending through one of said openings in said housing and in spaced concentric relation to a first of said legs of said filament and a second sleeve of an inside diameter less than said predetermined diameter extending through a second of said openings in said housing and in spaced concentric relation to a second of said legs of said filament; a first electrically insulating bushing mounted in a first opening of said pair of openings in said housing and receiving said first leg of said filament and said first sleeve of said second repeller assembly therein; and a second electrically insulating bushing mounted in a second opening of said pair of openings in said housing and receiving said second leg of said filament and said second sleeve of said second repeller assembly therein.