Patent ID: 9304401
Filing Date: 2016-04-05
CPC Classification: G03F

Claim Text:
1. A lithographic apparatus, comprising: a programmable patterning device, configured to provide a plurality of radiation beams; a projection system, configured to project the plurality of radiation beams onto a substrate to form respective spots of radiation; and a radiation spot measurement system, comprising: a target, onto which the spots of radiation may be projected for a spot measurement process, the target comprising a plurality of measurement targets; a radiation detector, configured to detect radiation from one of the spots of radiation that has been projected onto the measurement target; an actuator system configured to control the position of the radiation detector relative to the plurality of measurement targets such that, at different respective positions, it can detect radiation that has been projected onto a different measurement target of the plurality of measurement targets; and a controller, configured to receive information from the radiation detector and, based on the information, to determine at least the position of the spot of radiation relative to an intended position of the spot of radiation on the target in a plane substantially parallel to a surface of the target.