ELECTROSTATIC CLAMP APPARATUS AND LITHOGRAPHIC APPARATUS

摘要

Disclosed is an electrostatic clamp apparatus ( 500 ) constructed to support a patterning device ( 505 ) of a lithographic apparatus, comprising a support structure against which said patterning device is supported, clamping electrodes ( 525 ) for providing a clamping force between the support structure and patterning device, and an array of capacitive sensors ( 660 ) operable to measure the shape of said patterning device.