APPARATUS AND METHOD FOR CONTROLLING ION BEAM USING ELECTOSTATIC FILTER

An apparatus is provided. The apparatus may include a main chamber, an entrance tunnel, the entrance tunnel having an entrance axis extending into the main chamber; an exit tunnel, connected to the main chamber and defining an exit axis, wherein the entrance tunnel and the exit tunnel define a beam bend of less than 25 degrees therebetween, and an electrode assembly, disposed in the main chamber, and defining a beam path between the entrance tunnel and the exit tunnel. The electrode assembly may include an upper electrode, disposed on a first side of the beam path, and a plurality of lower electrodes, disposed on a second side of the beam path, the plurality of lower electrodes comprising at least three electrodes.