Patent ID: 8669517
Filing Date: 2014-03-11
Classification: H01J

Abstract:
1. An ion implantation system, comprising: an ion source configured to generate an ion beam comprising a plurality of isotopes that propagate along a beamline; a mass analyzer configured to generate a magnetic field that bends a trajectory of respective isotopes within the ion beam based upon a charge-to-mass ratio of the isotopes; a mass analysis variable exit aperture configured to insert an ambulatory blocking structure into the ion beam that prevents isotopes within a cross sectional area of the ion beam from propagating down the beamline; and a resolving aperture comprising an opening with a fixed size located downstream from the mass analyzer, wherein the opening is positioned relative to the ion beam so as to reject ions of an inappropriate charge-to-mass ratio; wherein the ambulatory blocking structure comprises a wedge shaped structure configured to deflect isotopes having a selected charge-to-mass ratio away from the beamline, which tapers from a thick end that enters the beamline first to a thin end that enters the beamline at a later time.