Due to the large dimensions of third generation synchrotron radiation sources, no optical element can be placed closer than 25-30 meters away from the source. As a result, some of the standard x-ray optics layouts cannot be used without accepting a severe loss of performance. In an effort to overcome those limitations we decided to get away from the 1 to 1 toroidal focusing optics that is routinely used in synchrotron x-ray applications and, instead, to base out beam line optical design on a bendable conical x-ray mirror with unequal vertical and horizontal focal lengths. This raised some questions regarding both the optical performance of such mirror and the existence of the technology to fabricate it. Both questions were in principle answered positively. This paper discusses detail of the optical design and performance analysis and presents the results obtained while developing a fabrication process capable of producing conical x-ray optic.
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