Abstract:
A control system for a positioning system, for positioning a driven object, e.g. in a lithographic apparatus, in N dimensions has M sensors, where M>N. A transformation module converts the M measurements by the sensors into a positional estimate in N dimensions taking into account compliance of the driven object.
Abstract:
An object positioning system including a movable object, an actuator system and a control system. The moveable object is moveable relative to a reference. The actuator system is configured to apply a force to the object at a force application location on the object in order to move the moveable object relative to the reference. The control system is configured to position a point of interest of the object relative to the reference. The control system is configured to drive the actuator system based on a parameter representing a spatial relationship between the force application location and the point of interest. The parameter is dependent on a further parameter representing a position of the object relative to the reference.
Abstract:
An EUV source for generating a beam of EUV radiation, has a droplet generator with a nozzle assembly to emit droplets of fuel from a nozzle towards a plasma formation location. The nozzle assembly receives the fuel from a reservoir. The nozzle assembly has a pump chamber receiving the fuel from the reservoir and an actuator to vibrate a membrane that forms a wall of the pump chamber. The wall is oriented perpendicularly to a direction wherein the nozzle emits the fuel. The nozzle assembly has first and second nozzle filters non-adjacently arranged in series in a path of the fuel from the pump chamber to the nozzle.
Abstract:
A lithographic apparatus includes a driven object having compliant dynamics; a plurality of actuators configured to act on the driven object, wherein the plurality of actuators are over-determined in an actuator degree of freedom; a control system including a transformation matrix configured to generate controller output signals for each of the plurality of actuators in response to a setpoint, wherein the transformation matrix is configured such that the controller output signals do not excite the compliant dynamics of the driven object in at least one degree of freedom.