Patent ID: 6898270

Claim:
An X-ray optical system for X-ray analysis of a sample, the system comprising: a first graded multi-layer mirror; an X-ray source for generating X-rays ampingent on said first graded multi-layer mirror, said X-ray source having an extension Q x in an X-direction, perpendicular to a connecting line in a z-direction between said X-ray source and said first graded multi-layer mirror, which is larger than a region of acceptance of said first graded multi-layer mirror in a first focus of said first mirror in said x-direction; and a first collimator disposed at said first focus between said X-ray source and said first mirror, said first collimator having a first opening in said x-direction corresponding to a region of acceptance of said first mirror, wherein a separation q zA between said first collimator and said X-ray source is given by q zA =Q x /tan α x , with α x being an angle subtended by said first graded multi-layer mirror in said x-direction as seen from said first collimator.