Patent ID: 9007560
Filing Date: 2015-04-14
Classification: B03C,G03F,H05G

Abstract:
1. A radiation source comprising: a reservoir configured to retain a volume of fuel; a nozzle, in fluid connection with the reservoir, and configured to direct a stream of fuel along a trajectory towards a plasma formation location; a laser configured to direct laser radiation at the stream at the plasma formation location to generate, in use, a radiation generating plasma; and a fuel contamination control arrangement, the contamination control arrangement comprising: a magnetic field generation element configured to generate a magnetic field; an electric field generation element, comprising two electrodes disposed outside, and on either side of, the nozzle or a conduit between the reservoir and the nozzle, and configured to generate an electric field; wherein the magnetic field generation element and the electric field generation element together being configured to ensure that, in use, the magnetic field and the electric field overlap at a location, or a potential location, of contamination within the nozzle or the conduit, and to ensure that lines of flux of the magnetic field and electric field are non-parallel at that location, in order to control movement of the contamination.