BM20 - ROBL - The Rossendorf Beamline

The Rossendorf Beamline (BM20)

 

Homepage of the Rossendorf Beamline at HZDR

RCH publications at ResearcherID

MRH publications

 

HZDR logo gif
 
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,
Technician
1941

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

  • Collimating mirror with Pt, Rh and Si surfaces (water-cooled)
  • Double-crystal monochromator with three pairs of crystals (Si(111), Si(111)90°, Si(311) mounted on one axis (water-cooled)
  • Double-multilayer monochromator
  • Horizontally focussing mirror with two toroids with Pt and Rh coating and a flat Si surface
  • Slits and beam diagnostics after each optical element
  • Useful energy range 5-35 keV with all crystal pairs

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
  • 4-element Si-DRIFT detector for higher energy resolution
  • 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).