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Department Optics and Beamlines

BESSY III CDR Project

As part of the development of the next-generation synchrotron light source, BESSY III, the Helmholtz-Zentrum Berlin (HZB) is in the critical phase of compiling the Conceptual Design Report (CDR). In collaboration with scientists from around the world, we are defining the requirements and conditions for future beamlines and experiments.

Building on the pre-CDR of BESSY III and insights gained from numerous workshops in renewable energy, photovoltaics, quantum mechanics, metrology, and life sciences, we are designing and simulating the first beamline prototypes. The increased dimensions of BESSY III offer greater flexibility for innovative beamline designs and concepts. The standard beamline will span 55–58 meters in the straight sections of the storage ring (SR) and will incorporate an undulator. Thanks to the advanced lattice design of the SR and the efficient double-prong configuration of the radiation protection wall, two of the six dipoles in each section can be utilized. Additionally, in the current building design, up to four beamlines with lengths of up to 95 meters can be implemented for applications such as high-resolution spectroscopy.

 

Planned Beamline Types

For BESSY III, we are developing three distinct beamline types:

  • Classical Soft X-ray Beamlines:
    • Energy range: ~100–2000 eV
    • Purpose: Optimized for traditional soft X-ray experiments in material science, chemistry, and physics, providing essential insights into electronic structures, bonding states, material properties, and surface interactions.
  • Tender X-ray Beamlines
    • Energy range: ~500–5000 eV
    • Purpose: Closing the energy gap between soft and hard X-rays.
    • Applications: Crucial for studying bulk material properties, deep layers, and interfaces.
  • Specialized Beamlines for Advanced Research
    • Energy range: 1–50,000 eV and/or high resolution (up to 100,000) and/or high photon flux.
    • Purpose: Tailored beamlines for specialized research applications.
 

Beamline Components

Depending on the research requirements, beamlines will incorporate different configurations, including:

  • Insertion device (ID) + plane grating monochromator (PGM)
  • Dipole + PGM
  • ID/PGM + double crystal monochromator (DCM)
  • Multilayer options for gratings and mirrors

The first design of the standard beamline for BESSY III has been completed, and we are now simulating real user cases to demonstrate the scientific potential and impact of this next-generation synchrotron. Below, you can see our initial design, which we are further refining by exploring different mirror and grating coatings, as well as various undulator sources, to achieve optimal performance and establish a new benchmark for next-generation beamlines in synchrotron research.

Standard-PGM-BL - enlarged view

© 04/25 smalerz