Patent ID: 8120748

Claim:
A lithographic apparatus comprising: a support configured to support a patterning device, the patterning device configured to form a patterned beam of radiation; a substrate table configured to hold a substrate; a projection system configured to project the patterned beam of radiation toward each of a plurality of target fields of the substrate; and a controller in communication with a substrate track apparatus configured to process substrates, the controller configured to control repeated exposures of a pattern of the patterning device at different exposure conditions within each of a plurality of subfields of each of the target fields such that each of the subfields within each target field is exposed repeatedly with said pattern at the different exposure conditions, each exposure condition imparting a change in a projected image of the pattern on the substrate, control processing of the substrate at a production processing condition in the substrate track apparatus, determine, for each of the plurality of subfields, a characteristic of the subfield of the processed substrate based on measured attributes of the subfield of the processed substrate, wherein the characteristic is a parameter of a model that reflects photoresist sensitivity, identify differences between the characteristics determined for the plurality of subfields, determine variations in production processing condition as a function of the identified differences, and adjust the production processing condition based on the determined differences.