The Rossendorf Beamline (BM20)

Homepage of the Rossendorf Beamline at HZDR

RCH publications at ResearcherID

MRH publications

Contact Tel: +33(0)47688 +ext Andreas Scheinost, Head of Beamline and Radiochemistry 2462 Carsten Bähtz, Material Science 2367 Joerg Exner, Technician 2372 Matthias Fengler,      1941 Technician

Synopsis

The Rossendorf Beamline is one of 12 Collaborating Research Group (CRG) beamlines, located at bending magnet 20 of the ESRF. It is owned and operated by the Helmholtz-Zentrum Dresden Rossendorf (HZDR, Germany). The beamline consists of two experimental stations:

• RCH, an X-ray absorption spectroscopy endstation for Environmental Chemistry of Radionuclides
  
• MRH, an X-ray diffraction and reflectivity endstation for Materials Science.

Scientific Applications

• Fundamental and applied radioecological research to allow for better risk assessments of nuclear waste storage; improved remediation strategies for areas contaminated by radionuclides; chemical speciation of radionuclides in soils, sediments, aquifers, mining shafts etc.; investigation of binding mechanisms of radionuclides with natural and anthropogenic organic matter, micro-organisms, clay minerals, rock surfaces; influence of these interactions on radionuclide migration and retardation in the environment.
  
• Structural identification and characterisation of modifications of surfaces or near surface layers and interfaces produced by ion beam techniques for applications as hardcovers, in semiconductor technology, or for biocompatible materials. Study of interfaces in thin films and nanometer-multilayers.

Equipment Overview

Optics

• Double-crystal Si(111) monochromator with two collimating/focusing mirrors (Si and Pt-coating) for rejection of higher harmonics
  
• Useful energy range 6-33 keV

RCH

• Standard equipment to perform XANES (X-ray absorption near edge spectroscopy) and EXAFS (extended X-ray absorption fine-structure spectroscopy)
  
• 13-element, high-throughput Ge-detector for fluorescence detection of dilute samples
  
• Closed-cycle He-Cryostat for sample cooling down to 15 K
  
• Safety features and legal permission to run a range of radionuclides with a maximum activity of 185 MBq
  
• Electrochemical cell for in-situ modification of redox
  
• Automated sample holders

MRH

• multi-purpose, heavy-duty 6-circle Huber diffractometer
  
• ML-mirror / beam deflector
  
• Ge and C analyzers, Ge channel-cut scintillators, PIN-diodes
  
• 2-dimensional CCD
  
• linear PSD
  
• Annealing and magnetron sputter chambers for in-situ sample treatments

Additional Information

Please visit the website of the Rossendorf Beamline at the Helmholtz-Zentrum Dresden-Rossendorf (HZDR).