Patent ID: 7501640
Filing Date: 2009-03-10
Classification: H05H

Abstract:
1. An electron beam and particle beam system including an electron beam, a particle beam and neutralizing-background-ions, comprising: a vacuum chamber to allow passage, merging and separation of said electron beam and said particle beam including an overlap region wherein said electron beam and said particle beam are overlapped; an electron supply device including a cathode to produce said electron beam; an electron collector including a collection plate to collect said electron beam; a first electrode located downstream from said cathode biased at a positive potential with respect to said cathode in order to accelerate said electron beam; a second electrode located downstream from said first electrode and upstream from said overlap region and biased at a less positive potential than said first electrode to provide a first end of a longitudinal electric potential trap for said neutralizing-background-ions; a magnetic field production device to create magnetic fields to guide said electron beam along a desired path, merge and separate said electron beam and said particle beam, and to provide radial trapping for said neutralizing-background-ions; a third electrode located downstream from said overlap region; a fourth electrode located downstream from said third electrode and biased at a more positive potential than said third electrode to provide a second end of the longitudinal electric potential trap for said neutralizing-background-ions.