Patent ID: 7888660
Filing Date: 2011-02-15
Classification: H01J

Abstract:
1. In an ion implantation apparatus including a source of charged particles for an ion beam, and for implantation of charged particles in the ion beam into a workpiece, the improvement comprising: first and second multicoil arrangements, wherein each said multicoil arrangement comprises a longitudinally extending ferromagnetic bar, and a plurality of first coil units wound independently and positioned adjacently on said bar; a pair of second coil units, said second coil units being wound independently and one of said pair of second coil units being positioned adjacent each end of a said bar; controllable power supplies for passing electrical current independently through each adjacently positioned coil unit on each of said longitudinally-extending bars of said first and second multicoil arrangements, whereby (a) each adjacently positioned coil unit becomes excited, (b) each excited coil unit independently generates a magnetic field extending orthogonally between said longitudinally-extending bars, (c) a plurality of said magnetic fields generated by said coils together form a magnetic field orthogonally extending between said first and second multicoil arrangements, and (d) the magnetic field generated by each of said coils be individually altered; electrical connections for passing electrical current independently through each of said second coil units adjacent an end of a said bar whereby said second coil units become excited and generate an orthogonally extending magnetic field adjacent each end of a said bar; an opening at least partially bounded by said multicoil arrangements for applying the magnetic field generated by said plurality of coils to an ion beam traveling therethrough.