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Author Wagner, U. H. ♦ Parsons, A. ♦ Rahomaki, J. ♦ Vogt, U. ♦ Rau, C.
Source United States Department of Energy Office of Scientific and Technical Information
Content type Text
Language English
Subject Keyword PARTICLE ACCELERATORS ♦ BEAMS ♦ BORON ♦ COHERENCE LENGTH ♦ DIAMONDS ♦ DIFFRACTION ♦ FIBERS ♦ HARD X RADIATION ♦ KEV RANGE ♦ MICROSCOPY ♦ PERFORMANCE
Abstract I13 is a 250 m long hard x-ray beamline (6 keV to 35 keV) at the Diamond Light Source. The beamline comprises of two independent experimental endstations: one for imaging in direct space using x-ray microscopy and one for imaging in reciprocal space using coherent diffraction based imaging techniques [1]. An outstanding feature of the coherence branch, due to its length and a new generation of ultra-stable beamline instrumentation [2], is its capability of delivering a very large coherence length well beyond 200 μm, providing opportunities for unique x-ray optical experiments. In this paper we discuss the challenges of measuring a large coherence length and present quantitative measurement based on analyzing diffraction patterns from a boron fiber [3]. We also discuss the limitations of this classical method in respect to detector performance, very short and long coherence lengths. Furthermore we demonstrate how a Ronchi grating setup [4] can be used to quickly establish if the beam is coherent over a large area.
ISSN 0094243X
Educational Use Research
Learning Resource Type Article
Publisher Date 2016-07-27
Publisher Place United States
Volume Number 1741
Issue Number 1


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