Apparatus including a radiation source, a filter system for filtering particles out of radiation emitted by the source, and a processing system for processing the radiation, a lithographic apparatus including such an apparatus, and a method of filtering particles out of radiation emitting and propagating from a radiation source

摘要

Particles emitted by a radiation source, and moving from the radiation source towards a processing system for processing the radiation from the radiation source, are filtered out of radiation propagating through a predetermined cross section of the radiation as emitted by the radiation source by a filter system. The filter system includes a plurality of foils and a transporter for transporting the foils along a trajectory which extends within the beam so that the foils intercept the particles within the beam. The transporter is arranged to transport the foils by a substantially translatory movement of the foils along at least a part of the trajectory.