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Automatic alignment of a Kirkpatrick–Baez active optic by use of a soft-x-ray Hartmann wavefront sensor

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Abstract

We present what we believe to be the first automatic alignment of a synchrotron beamline by the Hartmann technique. Experiments were performed, in the soft-x-ray range (E=3keV, λ=0.414nm), by using a four-actuator Kirkpatrick–Baez (KB) active optic. A system imaging the KB focal spot and a soft-x-ray Hartmann wavefront sensor were used alternatively to control the KB optic. The beam corrected with the help of the imaging system was used to calibrate the wavefront sensor. With both closed loops, we focused the beam into a 6.8μm×9μm FWHM focal spot.

© 2006 Optical Society of America

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