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1 m long multilayer-coated deformable piezoelectric bimorph mirror for adjustable focusing of high-energy X-rays

Sutter, John P.; Chater, Philip A.; Signorato, Riccardo; Keeble, Dean S.; Hillman, Michael R.; Tucker, Matthew G.; Alcock, Simon G.; Nistea, Ioana-Theodora; Wilhelm, Heribert

Abstract:
The Diamond Light Source (DLS) beamline I15-1 measures atomic pair distribution functions (PDF) using scattering of 40-80 keV X-rays. A unique focusing element was needed to condense these X-rays from an initial large cross section (11.0 mm H × 4.2 mm V) into a required spot size of FWHM ≈680 μm (H) × 20 μm (V) at a variable position between the sample and the detector. The large numerical aperture is achieved by coating a silicon substrate over 1 m long with three multilayer stripes of Bragg angle 4.2 mrad. One stripe selects X-rays of each energy 40.0, 65.4, and 76.6 keV. Sixteen piezoelectric bimorph actuators attached to the sides of the mirror substrate adjusted the reflecting surface’s shape. Focal spots of vertical width < 15 μm were obtained at three positions over a 0.92 m range, with fast, easy switching from one focal position to another. Minimized root mean square slope errors were close to 0.5 μrad after subtraction of a uniform curvature. Reflectivity curves taken along each stripe showed consistent high peaks with generally small angular variation of peak positions. This is the first application of a 1 m long multilayercoated bimorph mirror at a synchrotron beamline. ... mehr

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Verlagsausgabe §
DOI: 10.5445/IR/1000099882
Veröffentlicht am 14.11.2019
Originalveröffentlichung
DOI: 10.1364/OE.27.016121
Scopus
Zitationen: 1
Web of Science
Zitationen: 1
Cover der Publikation
Zugehörige Institution(en) am KIT Helmholtz-Institut Ulm (HIU)
Publikationstyp Zeitschriftenaufsatz
Publikationsmonat/-jahr 05.2019
Sprache Englisch
Identifikator ISSN: 1094-4087
KITopen-ID: 1000099882
HGF-Programm 37.01.01 (POF III, LK 01) Fundamentals and Materials
Erschienen in Optics express
Verlag Optical Society of America (OSA)
Band 27
Heft 11
Seiten 16121-16142
Nachgewiesen in Scopus
Web of Science
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