Patent ID: 6803585
Filing Date: 2004-10-12
Classification: H01J

Abstract:
An electron cyclotron resonance type ion source comprising: a hollow housing, which functions as an anode and is maintained under high voltage, said housing being made of a non-magnetic material; a source of electric power having a negative terminal and a positive terminal, said positive terminal being connected to hollow housing for applying said high voltage, said negative terminal of said source of electric power being grounded, the interior of said sealed hollow housing forming a plasma-confining cavity having an axial length; permanent magnetic field generation means for generating a permanent magnet field within said plasma-confining cavity for confining a plasma, formed in said plasma-confining cavity, in a radial inward direction; microwave energy generation means with a frequency satisfying a condition of electron-cyclotron resonance consumption of microwave energy by said plasma, said microwave energy generation means comprising at least two individual microwave generators and at least two microwave energy pumping units, respectively, for supplying microwave energy into said plasma-confining cavity, said microwave energy having a frequency required for said condition of electron-cyclotron resonance consumption for electrons of said plasma; at least one window extending in the direction of said axial length, said window being transparent to said microwave energy of said microwave energy pumping units for passing said microwave energy to said plasma-confining cavity, said at least one window having means for sealing said plasma-confining cavity; RF energy supply means for supplying RF energy to said plasma-confining cavity; means for the supply of a gaseous medium into said sealed hollow housing; ion-beam formation and extraction means for forming an ion beam and extracting said ion beam from said plasma; and means for cleaning said at least one window from contamination.