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Focusing XFEL SASE pulses by rotationally parabolic refractive x-ray lenses
- Seiboth, F. (author)
- Schropp, A. (author)
- Hoppe, R. (author)
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- Meier, V. (author)
- Patommel, J. (author)
- Lee, H. J. (author)
- Nagler, B. (author)
- Galtier, E. C. (author)
- Arnold, B. (author)
- Zastrau, U. (author)
- Hastings, J. B. (author)
- Schroer, C. G. (author)
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- (creator_code:org_t)
- 2014-04-03
- 2014
- English.
- In: Journal of Physics, Conference Series. - : IOP Publishing. - 1742-6588 .- 1742-6596. ; 499:1, s. 012004-
- Journal article (peer-reviewed)
Abstract
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- 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.
Subject headings
- NATURVETENSKAP -- Fysik -- Annan fysik (hsv//swe)
- NATURAL SCIENCES -- Physical Sciences -- Other Physics Topics (hsv//eng)
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- art (subject category)
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- Seiboth, F.
- Schropp, A.
- Hoppe, R.
- Meier, V.
- Patommel, J.
- Lee, H. J.
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- Nagler, B.
- Galtier, E. C.
- Arnold, B.
- Zastrau, U.
- Hastings, J. B.
- Nilsson, Daniel
- Uhlén, Fredrik
- Vogt, Ulrich
- Hertz, Hans M.
- Schroer, C. G.
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