Patent ID: 7687788
Filing Date: 2010-03-30
Classification: B82Y,G03F

Abstract:
1. A debris prevention system constructed and arranged to prevent debris that emanates from a radiation source from propagating with radiation from the radiation source into or within a lithographic apparatus, the debris prevention system comprising: an aperture that defines a maximum emission angle of the radiation coming from the radiation source; a first debris barrier having a radiation transmittance, the first debris barrier comprising a rotatable foil trap; and a second debris barrier having a radiation transmittance, wherein said first debris barrier is configured to cover a part of said emission angle and said second debris barrier is configured to cover another part of said emission angle, and wherein the rotatable foil trap comprises a shaft mounted radially with respect to the radiation source, and a plurality of foils mounted radially with respect to said shaft that provide a barrier against said debris.