Simulation study of four-mirror alignment of advanced Kirkpatrick−Baez optics

We have studied four-mirror alignment for an advanced Kirkpatrick−Baez optics system that consists of two sets of mirrors made up of an elliptical mirror and a hyperbolic mirror. To develop an achromatic hard X-ray imaging system, the tolerance limits for alignment errors to form an image without degrading the resolution were calculated using a wave-optics simulation. A four-mirror alignment procedure is proposed based on the results obtained.