Abstract:
The invention relates to a substrate support (WT) for supporting a substrate (W). The substrate support comprises the main body (MB), a clamping device (VC; VSO) and a dither device (DD). The main body comprises the support surface (S) for supporting the substrate (W). The clamping device is arranged to provide the clamping force to clamp the substrate on the support surface. The dither device is configured to dither the clamping force. The dither device may be configured to dither the clamping force while the substrate W is being loaded onto the support surface.
Abstract:
The invention relates to a positioning system comprising: - a first body; - a second body; - an actuator arranged between the first body and the second body to position the first body relative to the second body; and wherein the actuator comprises a first piezoelectric actuator and a second piezoelectric actuator arranged in series, wherein the first piezoelectric actuator has a first hysteresis, wherein the second piezoelectric actuator has a second hysteresis smaller than the first hysteresis, wherein the second piezoelectric actuator has a positioning range at least equal to the first hysteresis.