Patent ID: 7259832

Claim:
A lithographic apparatus comprising: (a) an illumination system configured to condition a beam of radiation; (b) a support structure configured to support a patterning device, the patterning device serving to impart the beam of radiation with a pattern in its cross-section; (c) a substrate table configured to hold a substrate; (d) a projection system configured to project the patterned beam of radiation onto a target portion of the substrate, and (e) an actuator configured to position a first part of the lithographic apparatus relative to a second part of the apparatus in a first direction, the actuator comprising: (i) a first assembly attached to the first part, the first assembly comprising a permanent magnet magnetized in substantially the first direction, and (ii) a second assembly attached to the second part, the second assembly comprising at least two non-magnetic coils having conductive parts substantially perpendicular to said first direction, wherein said at least two coils are spaced apart in said first direction so as to define a space between them in which said permanent magnet of said first assembly is at least partly located.