Patent ID: 8455848

Claim:
An ion beam detector assembly comprising: a plurality of pairs of ion current sensors disposed along a path of an ion beam in an ion implanter, each of said pairs of ion current sensors disposed on a detector array, a first of said pair of current sensors detecting a first beam current, and a second of said pair of current sensors detecting a second beam current wherein each of said first and second detected beam currents is used to determine an angle of incidence of the ion beam; and a blocker panel fixed to the detector array to move together in a fixed relationship with the detector array through the ion beam, the blocker panel disposed a distance ‘d’ upstream from the plurality of pairs of ion current sensors, said blocker panel configured to block portions of the ion beam having a first group of angles of incidence from reaching a first section of each of said ion current sensors and allowing portions of the ion beam having a second group of angles of incidence to reach a second section of each of said ion current sensors.