Patent ID: 8164737

Claim:
A lithographic apparatus comprising: an illumination system configured to condition a radiation beam; a support configured to support a patterning device, the patterning device being capable of imparting the radiation beam with a pattern in its cross-section to form a patterned radiation beam; a substrate table configured to hold a substrate; a projection system configured to project the patterned radiation beam onto a target portion of the substrate; and a damping system configured to dampen a vibration of at least part of the projection system, the damping system comprising an interface damping mass connected to the projection system; an active damping subsystem configured to dampen a vibration of at least part of the interface damping mass, the active damping subsystem connected to the interface damping mass, the active damping subsystem comprising a sensor configured to measure a position quantity of the interface damping mass; and an actuator configured to exert a force on the interface damping mass based on a signal provided by the sensor; and an interface damping device connected to the interface damping mass and configured to damp a movement of the interface damping mass at an eigenfrequency of the interface damping mass.