Patent ID: 8564757

Claim:
An immersion lithographic apparatus comprising: a projection system; a liquid confinement structure configured at least partly to confine immersion liquid to an immersion space defined by the projection system, the liquid confinement structure and a substrate and/or substrate table; a liquid supply device comprising a first liquid source, a second liquid source comprising a source of an active cleaning agent, a mixer configured to mix liquid from the first liquid source with liquid from the second liquid source, and a conduit configured to provide mixed liquid from the mixer to the liquid confinement structure; and a controller configured to control supply of mixed liquid, comprising liquid from the first source and liquid from the second source, from the liquid supply device to the liquid confinement structure during impingement of a beam of radiation from the projection system through immersion liquid on the substrate, wherein the conduit provides mixed liquid to a first opening in a surface of the liquid confinement structure, and wherein liquid from the first liquid source is provided by a further conduit to a second opening, different from the first opening, into the immersion space without having liquid from the second liquid source mixed with it.