Patent ID: 7872244
Filing Date: 2011-01-18
Classification: B82Y,G03F,H05G

Abstract:
1. A source configured to generate radiation for a lithographic apparatus, the source comprising: an anode having an upper surface; and a cathode having an upper surface with a layer of a specific material provided thereon such that the source is configured to vaporize the specific material to generate a plasma which emits the radiation having a wavelength in the extreme ultraviolet range of the electromagnetic spectrum, the cathode and the anode configured to create a discharge in a fuel in a discharge space between the anode and the cathode so as to generate the plasma, the cathode and the anode positioned relative to each other so that, in use, current lines extending between the anode and the cathode are substantially curved so as to create a force that substantially radially compresses the plasma only in a region proximate the upper surface of the cathode or of the anode.