Patent Number: 
Section: claims

1. An EUV collector configured to transfer an emission of at least one EUV radiation source to a main intensity spot, the EUV collector comprising:a collector subunit comprising first and second grazing incidence mirrors arranged one behind the other, the first and second grazing incidence mirrors being configured to transfer EUV radiation from the radiation source to a transfer intensity spot; andan ellipsoid mirror having an ellipsoidal mirror surface configured so that, during use of the EUV collector, the EUV radiation impinges on the ellipsoidal mirror surface at an angle of incidence below a critical grazing incidence angle,wherein:the EUV collector has no more than one collector subunit comprising any grazing incidence mirrors in a path of an EUV partial beam between the EUV radiation source and the transfer intensity spot;EUV partial beams are emitted by the EUV radiation source so that each EUV partial beam is reflected by no more than one single collector subunit comprising at least one grazing incidence mirror;at least some of the EUV partial beams emitted by the EUV radiation source are reflected only by the collector subunit comprising the first and second grazing incidence mirrors;the collector subunit is configured to collect a forward emission portion of the emission of the at least one EUV radiation source which is emitted toward the main intensity spot; andthe ellipsoid mirror is configured to collect a backward emission portion of the emission of the at least one EUV radiation source which is emitted away from the main intensity spot. 2. The collector of claim 1, wherein the collector comprises exactly one collector subunit which comprises at least one grazing incidence mirror. 3. The collector of claim 1, wherein the collector comprises exactly two collector subunits which comprise at least one grazing incidence mirror. 4. The collector of claim 1, wherein the collector subunit comprising the first and second grazing incidence mirrors is configured to transfer the EUV radiation from the radiation source to an intermediate intensity spot. 5. The collector of claim 4, comprising a plurality of collector subunits is arrangeable around the EUV radiation source, each of the plurality of collector subunits comprises at least one grazing incidence mirror. 6. The collector of claim 1, wherein the collector comprises exactly one collector subunit which comprises at least one grazing incidence mirror and an ellipsoid mirror in the path of the EUV partial beam emitted by the radiation source between the EUV radiation source and the main intensity spot. 7. The collector of claim 1, wherein the collector is arranged so that EUV radiation reflected by the ellipsoid mirror is guided directly to the main intensity spot via a through-opening in the collector subunit comprising the first and second grazing incidence mirrors. 8. The collector of claim 1, wherein the collector is arranged so that EUV radiation reflected by the ellipsoid mirror is guided directly to the main intensity spot via a spatial region which is around the collector subunit comprising the first and second grazing incidence mirrors. 9. An illumination optics, comprising:a collector according to claim 1 configured to illuminate an object field which is imageable by an imaging optics. 10. An illumination system, comprising:at least one EUV radiation source; andan illumination optics comprising a collector according to claim 1 configured to illuminate an object field which is imageable by an imaging optics. 11. The illumination system of claim 10, comprising a plurality of EUV radiation source. 12. An apparatus, comprising:an illumination system comprising a collector according to claim 1;an imaging optics configured to image an object field into an image field,wherein the illumination optics is configured to illuminate the object field of the imaging optics, and the apparatus is a projection exposure apparatus. 13. The apparatus of claim 12, further comprising at least one EUV radiation source. 14. The apparatus of claim 12, wherein the collector comprises exactly one collector subunit which comprises at least one grazing incidence mirror. 15. A method of using a projection exposure apparatus comprising an illumination system and an imaging optics, the method comprising:using the illumination system to illuminate a reticle with EUV radiation; andusing the imaging optics to project at least a portion of the reticle onto a material which is sensitive to the EUV radiation,wherein the illumination system comprises a collector according to claim 1. 16. A collector, comprising:a plurality of ellipsoid mirrors comprising a first ellipsoid mirror and a second ellipsoid mirror,wherein:the collector is configured to transfer emission of EUV radiation from a plurality of EUV radiation sources to a single main intensity spot; andthe radiation sources are disposed at both ellipse focus points of at least one of the ellipsoid mirrors. 17. The collector of claim 16, further comprising:a collector subunit comprising first and second grazing incidence mirrors arranged one behind the other, the first and second grazing incidence mirrors being configured to transfer EUV radiation from the radiation source to a transfer intensity spot,wherein:the first ellipsoidal mirror surface is configured so that, during use of the EUV collector, the EUV radiation impinges on the first ellipsoidal mirror surface at an angle of incidence below a critical grazing incidence angle,EUV partial beams are emitted by a first EUV radiation source of the plurality of EUV radiation sources so that each EUV partial beam is reflected by no more than one single collector subunit comprising at least one grazing incidence mirror; andat least some of the EUV partial beams emitted by the first EUV radiation source are reflected only by the collector subunit comprising the first and second grazing incidence mirrors. 18. The collector of claim 17, wherein the collector comprises exactly one collector subunit which comprises at least one grazing incidence mirror. 19. The collector of claim 17, wherein the collector comprises exactly two collector subunits which comprise at least one grazing incidence mirror.