Patent ID: 7072021

Claim:
A lithographic apparatus comprising: an illuminator for conditioning a beam of radiation; a first support for supporting a patterning device, the patterning device serving to pattern the beam of radiation according to a desired pattern; a second support for supporting a substrate; a projection system for projecting the patterned beam onto a target portion of the substrate, the projection system comprising a lower surface for defining a working distance to said substrate; and at least one gas generator for generating a conditioned gas flow, said gas generator comprising a deflecting panel adjacent to a Z-mirror that defines the lower surface of the projection system for deflecting said gas flow to a lower volume generally located below the lower surface of said projection system, wherein said deflecting panel is shaped to provide a first downward flow direction, and a second flow direction that is generally parallel to a lower surface of the projection system and to guide the gas flow along a surface of the deflecting panel.