Patent ID: 8587762
Filing Date: 2013-11-19
Classification: G03F

Abstract:
1. A method of operating a fluid handling system of an immersion lithographic apparatus, the method comprising: measuring a performance parameter of the fluid handling system indicative of an effectiveness of containment of fluid between the fluid handling system and a substrate and/or substrate table to restrict undesired fluid escaping or leaking between the fluid handling system and the substrate and/or substrate table, the measuring the performance parameter comprising detecting a pressure variation on an outlet side of a single phase extractor of the fluid handling system; and generating a signal if the measuring indicates a loss in performance below a certain threshold which signal brings to attention that the containment performance of the fluid handling system has dropped below the certain threshold, the generating the signal comprising generating a signal if the detecting indicates a level of containment of fluid between the fluid handling system and a substrate and/or substrate table has dropped below a certain threshold.