Patent ID: 7459703
Filing Date: 2008-12-02
Classification: H01J

Abstract:
1. An ion implanter system, the system comprising: an ion beam generator for generating an ion beam; a platen; a first test wafer disposed on the platen toward which the ion beam is directed; a second test wafer disposed on the platen toward which the ion beam is directed along a wall of at least one template, the at least one template positioned adjacent an ion beam path, each template having a template surface that impedes a motion of an ion in the ion beam in response to the ion impacting the template surface, wherein the ion impacts the template surface in the case that a trajectory of the ion varies from an optimum trajectory by at least a pre-determined maximum variance angle and wherein the ion impacts the second test wafer in the case that the trajectory of the ion varies from the optimum trajectory by less than the pre-determined maximum variance angle; and means for determining, using the at least one template and the first and second test wafers, whether an ion beam trajectory varies from the optimum trajectory by at least the pre-determined maximum variance angle to monitor an integrity of the ion beam, wherein the means for determining measures a difference between a first number of ions that impact the first test wafer and a second number of ions that impact the second test wafer to determine whether the ion beam trajectory varies from the optimum trajectory by at least the pre-determined maximum variance angle.