Focusing XFEL SASE pulses by rotationally parabolic refractive x-ray lenses
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
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.
Place, publisher, year, edition, pages
2014. Vol. 499, no 1, 012004- p.
Other Physics Topics
IdentifiersURN: urn:nbn:se:kth:diva-145481DOI: 10.1088/1742-6596/499/1/012004ISI: 000338041300004ScopusID: 2-s2.0-84899584839OAI: oai:DiVA.org:kth-145481DiVA: diva2:718816
22nd International Congress on X-Ray Optics and Microanalysis, ICXOM 2013; Hamburg; Germany; 2 September 2013 through 6 September 2013
QC 201405222014-05-222014-05-212015-10-05Bibliographically approved