Patent ID: 7382438

Claim:
A lithographic apparatus comprising: an illumination system configured to condition a radiation beam; a support structure constructed to support a patterning device, the patterning device being capable of imparting the radiation beam with a pattern in the cross-section of the radiation beam to form a patterned radiation beam; a substrate table constructed to support a substrate; a projection system configured to project the patterned radiation beam onto a target portion of the substrate; and a controller configured to control at least one lithographic apparatus parameter, wherein said controller is configured to set said at least one lithographic apparatus parameter such that a difference between a critical dimension of pattern features formed on the substrate in regions of relatively high and relatively low pattern feature density is minimised for an area on the substrate in which the target portion is located, and the controller is configured to re-set said at least one lithographic apparatus parameter during a time period between the times of projection of the patterned radiation beam onto two areas of the substrate.