Patent ID: 8130359

Claim:
A lithographic apparatus comprising: an illumination system configured to condition a radiation beam; a support constructed to support a patterning device, the patterning device being configured to impart the radiation beam with a pattern in its cross-section to form a patterned radiation beam; a substrate table constructed to hold a substrate; and a projection system configured to project the patterned radiation beam onto a target portion of the substrate, the projection system comprising a vacuum chamber, a controller configured to control an actuator of an optical device arranged in the vacuum chamber, the actuator being configured to direct, shape and/or control the patterned radiation beam, and a hermetically sealed housing in which the controller is accommodated, the housing being arranged in the vacuum chamber and being provided with an electrical connection configured to electrically connect the controller to the actuator of the optical device, the housing being connected to an exterior wall of the vacuum chamber via a fluid cooling channel configured to cool the controller.