Patent Number: 
Section: claims

1. A device for improving resolution capability of an x-ray optical apparatus for an x-ray incident from a direction of incidence, comprising:a mirror element comprising a mirror edge formed as a cylindrical shell section around an edge axis,wherein the mirror element is spaced apart, in a radial direction, from a focal axis that is parallel to the direction of incidence,the edge axis is oriented at a first non-zero angle relative to the focal axis when viewed along a radial axis, andthe edge axis is oriented at a second non-zero angle relative to the focal axis. 2. The device of claim 1, wherein:the mirror element further comprises a second mirror edge adjacent the mirror edge,the second mirror edge is formed as a second cylindrical shell section around a second edge axis, anda plane comprising the edge axis and the second edge axis is tilted with respect to the direction of incidence. 3. The device of claim 2, wherein:the mirror edge corresponds to an approximation of a hyperbolic form, andthe second mirror edge corresponds to an approximation of a parabolic form. 4. The device of claim 2, further comprising another mirror element having a third mirror edge and a fourth mirror edge adjacent the third mirror edge. 5. The device of claim 4, wherein:the third mirror edge is formed as a third cylindrical shell section around a third edge axis,the other mirror element is spaced apart, in another radial direction, from the focal axis,the third edge axis is oriented at the first non-zero angle relative to the focal axis when viewed along another radial axis extending in the other radial direction, andthe third edge axis is oriented at the second non-zero angle relative to the focal axis. 6. The device of claim 5, wherein:the other mirror element is adjacent the mirror element, andthe mirror element and the other mirror element are spaced apart from the focal axis by a same distance. 7. The device of claim 6, wherein a transition between the mirror element and the other mirror element comprises a stepped offset. 8. The device of claim 4, further comprising a plurality of additional mirror elements forming a ring around the focal axis. 9. The device of claim 1, wherein a width of the mirror element is smaller than approximately one tenth of a radial distance between the mirror element and the focal axis. 10. The device of claim 9, wherein the width of the mirror element corresponds to an arc length of less than approximately two degrees in the radial direction. 11. The device of claim 1, wherein a magnitude of tilt between the edge axis and the direction of incidence is in a range of approximately one half a degree to approximately five degrees. 12. The device of claim 1, further comprising an additional mirror element spaced apart from the focal axis in the radial direction. 13. The device of claim 12, wherein a spacing of the additional mirror element from the focal axis is larger than a spacing of the mirror element from the focal axis. 14. The device of claim 1, wherein the mirror element is spaced apart, in the radial direction, from the focal axis of a focal point of the x-ray optical apparatus. 15. The device of claim 1, wherein when viewed along the radial axis:the mirror edge is arranged in a rotated position that is rotated about the radial axis relative to a reference position,in the reference position the edge axis is parallel to the focal axis, andin the rotated position the edge axis is rotated relative to the focal axis by the first non-zero angle. 16. A device for improving resolution of an x-ray optical apparatus associated with an x-ray incident from a direction of incidence, comprising:a mirror element having a first portion and a second portion adjacent the first portion,wherein the first portion comprises a first cylindrical shell section formed around a first edge axis tilted at a first non-zero angle relative to a focal axis that is parallel to the direction of incidence,the second portion comprises a second cylindrical shell section formed around a second edge axis tilted at a second non-zero angle relative to the focal axis, the second non-zero angle being different from the first non-zero angle, andthe first edge axis and the second edge axis are oriented at a third non-zero angle relative to the focal axis when viewed along a radial axis in a radial direction. 17. The device of claim 16, wherein a plane containing the first edge axis and the second edge axis is tilted at an offset angle relative to the focal axis. 18. The device of claim 17, wherein:the offset angle is in a range of approximately one half a degree to approximately five degrees, anda width of the mirror element is smaller than approximately one tenth of a radial distance between the mirror element and the focal axis. 19. The device of claim 16, wherein:the first portion comprises an approximation of a hyperbolic form, andthe second portion comprises an approximation of a parabolic form. 20. The device of claim 16, further comprising another mirror element having a third portion and a fourth portion adjacent the third portion,wherein the third portion comprises a third cylindrical shell section,the fourth portion comprises a fourth cylindrical shell section tilted relative to the third portion,the other mirror element is arranged in a stepped offset relative to the mirror element, andthe other mirror element is rotated about another radial axis that is perpendicular to the focal axis. 21. The device of claim 20, further comprising a plurality of additional mirror elements,wherein the mirror element, the other mirror element, and the plurality of additional mirror elements form a ring around the focal axis. 22. The device of claim 16, wherein when viewed along the radial axis:the first cylindrical shell section is arranged in a rotated position that is rotated about the radial axis relative to a reference position,in the reference position the first edge axis is parallel to the focal axis, andin the rotated position the first edge axis is rotated relative to the focal axis by the third non-zero angle.