Abstract
A new technique is presented to overcome beam size limitation in full field imaging at high brilliance synchrotron sources using specially designed refractive X-ray optics. These optics defocus the incoming beam in vertical direction and reshape the intensity distribution from a Gaussian to a more desirable top-hat-shaped profile at the same time. With these optics X-ray full-field imaging of extended objects becomes possible without having to stack several scans or applying a cone beam geometry in order to image the entire specimen. For in situ experiments in general and for diffraction limited sources in particular this gain in field of view and the optimization of the intensity distribution is going to be very beneficial.
Highlights
X-ray imaging techniques like tomography are commonly used at lab and at synchrotron sources for example in the fields of material science, medicine or biology [1,2,3,4,5,6,7]
A new technique is presented to overcome beam size limitation in full field imaging at high brilliance synchrotron sources using specially designed refractive X-ray optics
At the Institute of Microstructure Technology at Karlsruhe Institute of Technology (KIT/IMT) we have developed refractive beam shaping optics to overcome beam dimension limitations for full field imaging at high brilliance synchrotron sources
Summary
X-ray imaging techniques like tomography are commonly used at lab and at synchrotron sources for example in the fields of material science, medicine or biology [1,2,3,4,5,6,7]. The intensity profile of such an undulator source is approximately Gaussian shaped in vertical direction with a FWHM in the range of a few millimeters only [8] This is a strong limitation for many experiments, in particular full field imaging techniques at 3rd generation synchrotron sources [9,10]. The alignment is often very time consuming and the reconstruction cannot be performed using the parallel beam geometry approach Another drawback of a 3rd generation X-ray beam is the typical Gaussian intensity profile, leading to differences in the signal to noise ratio between the high-illumination center region and those regions illuminated by the low-intensity tails. At the Institute of Microstructure Technology at Karlsruhe Institute of Technology (KIT/IMT) we have developed refractive beam shaping optics to overcome beam dimension limitations for full field imaging at high brilliance synchrotron sources. In the following we describe the concept, the realization and the results of first performance studies using synchrotron micro computed tomography (SRμ-CT)
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