Patent ID: 9111719
Filing Date: 2015-08-18
Classification: H01J

Abstract:
1. A method for increasing utilization of an ion beam, the method comprising: providing a workpiece on a workpiece support; providing one or more side Faraday cups along a path of the ion beam and configured to sense a current of the ion beam, wherein the one or more side Faraday cups are separated from the workpiece by a distance associated with a diameter of the workpiece; reciprocally scanning the ion beam across a surface of the workpiece, wherein a narrow scan of the ion beam is generally defined by reversing a direction of the scanning of the ion beam at a position associated with an edge of the workpiece, and wherein a wide scan of the ion beam is generally defined by reversing a direction of the scanning of the ion beam at a position associated with an outboard region of the one or more side Faraday cups, and interlacing one or more narrow scans of the ion beam with one or more wide scans of the ion beam; sensing a current of the ion beam via the one or more side Faraday cups concurrent with the reciprocal scanning the ion beam; selectively electrically connecting the one or more side Faraday cups to a dosimeter concurrent with the wide scan of the ion beam; and selectively electrically connecting the one or more side Faraday cups to electrical ground concurrent with the narrow scan of the ion beam.