Patent ID: 8492055

Claim:
A method for fracturing or mask data preparation or proximity effect correction for charged particle beam lithography, the method comprising the steps of: setting a base dosage level for each of a plurality of exposures passes for a shaped beam charged particle beam writer; and determining a multiplicity of shots for the shaped beam charged particle beam writer, the shots comprising: a first group of shots consisting of a plurality of shots for at least two of the plurality of exposure passes, wherein the union of the plurality of shots for each exposure pass in the first group covers the same area as the union of all shots in the first group, and wherein shots within any one exposure pass are disjoint; and a second group of one or more shots, wherein each shot in the second group of shots is for exposure in an exposure pass in the plurality of exposure passes, and wherein each shot in the second group of shots overlaps a shot in the first group of shots.