Abstract
ROBL-II provides four different experimental stations to investigate actinide and other alpha- and beta-emitting radionuclides at the new EBS storage ring ofESRF within an energy range of 3 to 35 keV. The XAFS station consists of ahighly automatized, high sample throughput installation in a glovebox, to measure EXAFS and conventional XANES of samples routinely at temperatures down to 10 K, and with a detection limit in the sub-p.p.m. range. The XES station with its five bent-crystal analyzer, Johann-type setup with Rowland circles of 1.0 and 0.5 m radii provides high-energy resolution fluorescence detection (HERFD) for XANES, XES, and RIXS measurements, covering both actinide L and M edges together with other elements accessible in the 3 to 20 keV energy range. The six-circle heavy duty goniometer of XRD-1 is equipped for both high-resolution powder diffraction as well as surface-sensitive CTR and RAXR techniques. Single crystal diffraction, powder diffraction with high temporal resolution, as well as X-ray tomography experiments can be performed at a Pilatus 2M detector stage (XRD-2). Elaborate radioprotection features enable a safe and easy exchange of samples between the four different stations to allow the combination of several methods for an unprecedented level of information on radioactive samples for both fundamental and applied actinide and environmental research.
Highlights
The Rossendorf beamline has been operated at the ESRF since 1996 by Helmholtz-Zentrum Dresden-Rossendorf (HZDR) (Nitsche, 1995; Matz et al, 1999; Reich et al, 2000) and has been redesigned in 2016–2020 (ROBL-II)
ROBL-II receives synchrotron beam from a short bending magnet (SBM) with 0.86 T of the new ESRF storage ring, a 7BA lattice operating at 200 mA and 6 GeV
This optics setup consists of a combined double-crystal monochromator (DCM), and a doublemultilayer monochromator (DMM)
Summary
The Rossendorf beamline has been operated at the ESRF since 1996 by Helmholtz-Zentrum Dresden-Rossendorf (HZDR) (Nitsche, 1995; Matz et al, 1999; Reich et al, 2000) and has been redesigned in 2016–2020 (ROBL-II). (1) XAFS station with fluorescence and transmission detection for X-ray absorption fine-structure (XAFS) spectroscopy, including (conventional) X-ray absorption near-edge structure (XANES) and extended X-ray absorption finestructure (EXAFS) spectroscopies. (2) XES station with a five-crystal Johann-type spectrometer for high-energy-resolution fluorescence-detection X-ray absorption near-edge spectroscopy (HERFD-XANES), X-ray emission spectroscopy (XES) and resonant inelastic X-ray scattering (RIXS) measurements. (3) XRD-1 station with a heavy-duty, Eulerian cradle, sixcircle goniometer for (high-resolution) powder X-ray diffraction (PXRD), surface-sensitive crystal truncation rod (CTR) and resonant anomalous X-ray reflectivity (RAXR) measurements. (4) XRD-2 station with a Pilatus x2M detector stage for single crystal X-ray diffraction (SCXRD) and in situ/ in operando PXRD measurements. X-rays within 3 to 35 keV with energy resolution of a few eV (depending on the employed crystal pair and energy) for spectroscopy at the expense of photon flux. The DMM is used to produce an about 100 times higher photon flux in the energy range 8 to 19 keV at the expense of energy resolution ($ 100 eV) for scattering and selected spectroscopy applications, where energy resolution is not as critical or is improved
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