Patent ID: 8519366
Filing Date: 2013-08-27
Classification: G03F,H05G

Abstract:
1. A device comprising: a vessel; a near normal incidence EUV reflective optic defining an axis and disposed in said vessel, said optic having a focal point on said axis and near an irradiation region in said vessel; a trap disposed in the vessel, said trap having a plurality of spaced apart vanes, each of the vanes having a surface extending in the direction of said axis and radially; and a source of a magnetic field disposed in said vessel for deflecting debris in said vessel to protect said optic, said magnetic field being substantially axially symmetric about said axis, said source positioned to interpose the optic between the source and the irradiation region and a magnetic field shaping element disposed in said vessel and configured to curve said magnetic field to make said magnetic field proximate said surface of each of the vanes along the surface and approximately normal to the direction of ion paths from said irradiation region.