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Figure 4
(a) Horizontal and (b) vertical sizes of the X-ray beam as a function of time, as measured by the I24 beamline's scintillator and CCD camera. Voltage impulses of ±500 V were added to all piezo electrodes of each KB mirror to focus or defocus the X-ray beam in the horizontal or vertical direction simultaneously. The size of the beam is shown to be changeable in only a few seconds and is highly repeatable.

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