Patent ID: 6947118

Claim:
A lithographic apparatus comprising: an illumination system constructed to provide a beam of radiation; a support structure constructed to support a patterning device, said patterning device serving to impart a cross-section of said beam of radiation with a pattern to form a patterned beam; a substrate table for holding a substrate; a vacuum chamber provided with a first gas evacuator to generate a vacuum beam path for said beam of radiation; a projection system that projects said patterned beam onto a target portion of said substrate; a first conduit inside said vacuum chamber; a first conduit feedthrough through a wall of said vacuum chamber, said first conduit feedthrough constructed to allow the first conduit to pass through the wall; a first conduit shield inside said vacuum chamber, providing a first conduit path for at least a part of said first conduit, and shielding said vacuum chamber from said first conduit path; a first gas passage through said first conduit shield; a separate gas evacuation feedthrough through the wall of said vacuum chamber, said separate gas evacuation feedthrough being separate from said first conduit feedthrough; and a gas evacuation shield extending at least between said first gas passage and said separate gas evacuation feedthrough, providing a gas evacuation path from said first conduit path into an area outside said vacuum chamber, and shielding said vacuum chamber from said first gas evacuation path.