Patent ID: 8614784

Claim:
A fluid handling structure for a lithographic apparatus, the fluid handling structure successively having, at a boundary from a space configured to contain immersion fluid to a region external to the fluid handling structure: an elongate opening or a plurality of openings arranged in a first line that, in use, are directed towards a substrate, or towards a substrate table configured to support a substrate, or towards both the substrate and substrate table; a first gas knife device having an elongate aperture in a second line; an elongate opening or a plurality of openings in a third line, a second gas knife device having an elongate aperture in a fourth line, wherein the aperture in the second and fourth lines are connected, in use, to a gas supply; and the fluid handling structure having a controller connected or connectable to the gas supply, the controller configured to control the gas supply such that the gas flow rate out of the aperture in the fourth line to form the gas knife is greater than the gas flow out of the aperture in the second line to form the gas knife.