Patent ID: 7924404
Filing Date: 2011-04-12
Classification: G03F,Y10T

Abstract:
1. A lithographic projection apparatus, comprising: a substrate table constructed to hold a substrate; a projection system configured to project a patterned radiation beam onto a target portion of the substrate; a liquid supply system configured to at least partly fill a space between the projection system and the substrate table with a liquid, the liquid supply system comprising an outlet configured to remove a mixture of liquid and gas; and an evacuation system configured to draw the mixture of liquid and gas through the outlet, the evacuation system comprising: a manifold configured to receive the mixture of liquid and gas from the outlet and to provide the mixture toward a separator without removal of liquid from the mixture at the manifold, a gas inlet configured to supply the manifold with a flow of gas, the separator in fluid communication with the manifold and configured to receive the mixture of liquid and gas from the manifold, and to separate gas from the mixture, a pump arranged to apply suction to the separated gas in the separator, and a control system configured to measure a pressure in the manifold and to control the pressure in the manifold by controlling the flow of gas into the manifold from the gas inlet in response to the measured pressure.