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Focusing XFEL SASE pulses by rotationally parabolic refractive x-ray lenses
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2014 (English)In: Journal of Physics, Conference Series, ISSN 1742-6588, E-ISSN 1742-6596, Vol. 499, no 1, 012004- p.Article in journal (Refereed) Published
Abstract [en]

Using rotationally parabolic refractive x-ray lenses made of beryllium, we focus hard x-ray free-electron laser pulses of the Linac Coherent Light Source (LCLS) down to a spot size in the 100 nm range. We demonstrated efficient nanofocusing and characterized the nanofocused wave field by ptychographic imaging [A. Schropp, et al., Sci. Rep. 3, 1633 (2013)] in the case of monochromatic LCLS pulses produced by a crystal monochromator that decreases the LCLS bandwidth down to ΔE/E 1.4 · 10-4. The full spectrum of LCLS pulses generated by self-amplified spontaneous emission (SASE), however, fluctuates and has a typical bandwidth of a few per mille (ΔE/E 2 · 10-3). Due to the dispersion in the lens material, a polychromatic nanobeam generated by refractive x-ray lenses is affected by chromatic aberration. After reviewing the chromaticity of refractive x-ray lenses, we discuss the influence of increased bandwidth on the quality of a nanofocused SASE pulse.

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2014. Vol. 499, no 1, 012004- p.
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URN: urn:nbn:se:kth:diva-145481DOI: 10.1088/1742-6596/499/1/012004ISI: 000338041300004ScopusID: 2-s2.0-84899584839OAI: diva2:718816
22nd International Congress on X-Ray Optics and Microanalysis, ICXOM 2013; Hamburg; Germany; 2 September 2013 through 6 September 2013

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Available from: 2014-05-22 Created: 2014-05-21 Last updated: 2015-10-05Bibliographically approved

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Nilsson, DanielUhlén, FredrikVogt, UlrichHertz, Hans M.
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