Abstract:
A lithographic apparatus component, such as a metrology system or an optical element (e.g., a mirror) is provided with a temperature control system for controlling deformation of the component. The control system includes channels provided close to a surface of the component through which a two phase cooling medium is supplied. The metrology system measures a position of at least a moveable item with respect to a reference position and includes a metrology frame connected to the reference position. An encoder is connected to the moveable item and constructed and arranged to measure a relative position of the encoder with respect to a reference grid. The reference grid may be provided directly on a surface of the metrology frame. A lithographic projection apparatus may have the metrology system for measuring a position of the substrate table with respect to the projection system.
Abstract:
Disclosed is a substrate support for an apparatus of the type which projects a beam of EUV radiation onto a target portion of a substrate (400). The substrate support comprises a substrate table constructed to hold the substrate, a support block (420) for supporting the substrate table, and a cover plate (450') disposed around the substrate table. The top surface of the cover plate and the top surface of a substrate mounted on the substrate table are all substantially at the same level. At least one sensor unit (430) is located on the substrate support and its top surface is also at the same level as that of the cover plate and substrate. Also disclosed is an EUV lithographic apparatus comprising such a substrate support.
Abstract:
Disclosed is a substrate support for an apparatus of the type which projects a beam of EUV radiation onto a target portion of a substrate (400). The substrate support comprises a substrate table constructed to hold the substrate, a support block (420) for supporting the substrate table, and a cover plate (450′) disposed around the substrate table. The top surface of the cover plate and the top surface of a substrate mounted on the substrate table are all substantially at the same level. At least one sensor unit (430) is located on the substrate support and its top surface is also at the same level as that of the cover plate and substrate. Also disclosed is an EUV lithographic apparatus comprising such a substrate support.
Abstract:
A position measurement system includes a first part and a second part for determining a position of a first member relative to a second member by providing a position signal representing a position of the first part relative to the second part, and a computational unit comprising an input terminal for receiving the position signal. The computational unit is configured to, in use, apply a conversion to the position signal to obtain a signal representing a position of the first member relative to the second member; and apply an adjustment to the conversion to at least partly compensate for a drift of the first part or the second part or both. The adjustment is based on a predetermined drift characteristic of the first part or the second part or both respectively. The predetermined drift characteristic includes one or more base shapes of the first part and/or the second part.
Abstract:
A projection system (PS) is provided that includes a sensor system (20) that measures at least one parameter that relates to the physical deformation of a frame (10) that supports the optical elements (11) within the projection system (PS), and a control system (30) that, based on the measurements from the sensor system (20), determines an expected deviation of the position of the beam of radiation projected by the projection system (PS) that is caused by the physical deformation of the frame (10).