Patent ID: 8901521

Claim:
A method for producing extreme ultraviolet radiation, comprising: directing a radiation beam onto a droplet of an ignition material, the droplet being located at a target ignition position, so as to change the droplet into a plasma that is configured to produce an extreme ultraviolet radiation; reflecting the radiation using a collector mirror that includes a mirror surface to focus the radiation at a focal point; and providing a gas flow that is ejected from a fluid supply comprising a manifold with a plurality of apertures to eject gas, the manifold provided in front of the mirror surface or in front of an edge of the mirror surface, or both, so that said gas is provided by the manifold to the plurality of apertures without passing through said collector mirror, the gas flow being ejected in a manner such that, upon exiting said fluid supply, said gas flow is directed toward the target ignition position in a direction substantially transverse with respect to and away from the mirror surface to mitigate particle debris produced by the plasma.