Patent ID: 7542548

Claim:
An X-ray optical system comprising: an X-ray source, which generates an X-ray beam having a linear section; a diverging-beam path, in which the X-ray beam diverges with a predetermined divergence angle in a plane including both a direction perpendicular to a longitudinal direction of a cross section of the X-ray beam and a traveling direction of the X-ray beam, the plane being referred to as a specific plane hereinafter; a parallel-beam path, in which the X-ray beam travels in parallel in the specific plane; a parabolic multilayer mirror, which is arranged between the X-ray source and the parallel-beam path, and has a reflective surface having a parabolic shape in the specific plane and a parabolic focal point located on the X-ray source, and reflects the X-ray beam coming from the X-ray source at the reflective surface to generate a parallel beam; an optical-path selection slit device, which allows any one of the diverging and parallel beams to pass through and interrupts other of the diverging and parallel beams; and a polycapillary optics, which is detachably inserted into the parallel-beam path at a position behind the optical-path selection slit device, and receives the parallel beam and discharges a converging beam focused on a point.