Patent ID: 9711328
Date: 2017-07-18
CPC Classifications: H01J

Claim:
1. A measurement system for an ion implantation system, the measurement system comprising: a scan arm configured to rotate about an axis; a workpiece support in linear sliding engagement with the scan arm, wherein the workpiece support is configured to translate a workpiece through a path of an ion beam along an implantation plane; a first measurement component comprising a first faraday cup positioned downstream of the scan arm along the path of the ion beam, wherein the first faraday cup is configured to provide a first signal associated with ion radiation from the ion beam incident thereto; a second measurement component comprising a second faraday cup operably coupled to the scan arm and a mask, wherein the second faraday cup is configured to provide a second signal associated with ion radiation from the ion beam incident thereto concurrent with a rotation of the scan arm about the axis, and wherein the mask is positioned upstream of the second faraday cup, wherein the mask is generally fixed with respect to the second faraday cup and has a plurality of slits defined therein, and wherein the mask is configured to permit varying amounts of the ion radiation from the ion beam to pass therethrough to the second faraday cup based on a relative angular orientation between the mask and the ion beam, wherein the mask further comprises a blocking plate positioned at one or more outboard locations of the mask, and wherein the blocking plate is configured to selectively block the ion radiation from the ion beam incident to the first faraday based on the rotation of the scan arm about the axis; and a controller configured to determine an angle of the ion beam and a vertical size of the ion beam with respect to the implantation plane, wherein the determination is based, at least in part, on one or more of the first signal, second signal, and the relative orientation between the mask and the ion beam as the second measurement component rotates about the axis.