TY  - JOUR
A1  - Sokolov, Andrey
A1  - Huang, Qiushi
A1  - Senf, Friedmar
A1  - Feng, Jiangtao
A1  - Lemke, Stephanie
A1  - Alimov, Svyatoslav
A1  - Knedel, Jeniffa
A1  - Zeschke, Thomas
A1  - Kutz, Oliver
A1  - Seliger, Tino
A1  - Gwalt, Grzegorz
A1  - Schäfers, Franz
A1  - Siewert, Frank
A1  - Kozhevnikov, Igor
A1  - Qi, Runze
A1  - Zhang, Zhong
A1  - Li, Wenbin
A1  - Wang, Zhanshan
T1  - Optimized highly efficient multilayer-coated blazed gratings for the tender X-ray region
JF  - Optics express : the international electronic journal of optics
N2  - The optimized design of multilayer-coated blazed gratings (MLBG) for high-flux tender X-ray monochromators was systematically studied by numerical simulations. The resulting correlation between the multilayer d-spacing and grating blaze angle significantly deviated from the one predicted by conventional equations. Three high line density gratings with different blaze angles were fabricated and coated by the same Cr/C multilayer. The MLBG with an optimal blaze angle of 1.0 degrees showed a record efficiency reaching 60% at 3.1 keV and 4.1 keV. The measured efficiencies of all three gratings were consistent with calculated results proving the validity of the numerical simulation and indicating a more rigorous way to design the optimal MLBG structure. Published by The Optical Society under the terms of the Creative Commons Attribution 4.0 License.
Y1  - 2019
U6  - https://doi.org/10.1364/OE.27.016833
SN  - 1094-4087
VL  - 27
IS  - 12
SP  - 16833
EP  - 16846
PB  - Optical Society of America
CY  - Washington
ER  - 
TY  - JOUR
A1  - Schick, Daniel
A1  - Le Guyader, Loic
A1  - Pontius, Niko
A1  - Radu, Ilie
A1  - Kachel, Torsten
A1  - Mitzner, Rolf
A1  - Zeschke, Thomas
A1  - Schuessler-Langeheine, Christian
A1  - Föhlisch, Alexander
A1  - Holldack, Karsten
T1  - Analysis of the halo background in femtosecond slicing experiments
JF  - Journal of synchrotron radiation
N2  - The slicing facility FemtoSpeX at BESSY II offers unique opportunities to study photo-induced dynamics on femtosecond time scales by means of X-ray magnetic circular dichroism, resonant and non-resonant X-ray diffraction, and X-ray absorption spectroscopy experiments in the soft X-ray regime. Besides femtosecond X-ray pulses, slicing sources inherently also produce a so-called `halo' background with a different time structure, polarization and pointing. Here a detailed experimental characterization of the halo radiation is presented, and a method is demonstrated for its correct and unambiguous removal from femtosecond time-resolved data using a special laser triggering scheme as well as analytical models. Examples are given for time-resolved measurements with corresponding halo correction, and errors of the relevant physical quantities caused by either neglecting or by applying a simplified model to describe this background are estimated.
KW  - femtosecond slicing
KW  - halo
KW  - pump-probe
KW  - XMCD
KW  - X-ray scattering
Y1  - 2016
U6  - https://doi.org/10.1107/S160057751600401X
SN  - 1600-5775
VL  - 23
SP  - 700
EP  - 711
PB  - International Union of Crystallography
CY  - Chester
ER  -