Electron Storage Ring BESSY II

BESSY II generates bright light for researching energy and materials

BESSY II is a third-generation synchrotron radiation source that produces extremely bright X-ray light. Researchers from all over the world can use this light for their experiments. BESSY II is a universal tool for studying an endless variety of samples, for example solar cells, materials for solar hydrogen production and quantum materials. Proteins can be studied for the development of new medicines, and meteorites and archaeological finds can be investigated using the soft X-ray light from BESSY II.

Emil - Energy Materials In-situ Laboratory Berlin

BESSY II – more light for research: The electron storage ring BESSY II delivers brilliant X-ray pulses which allow observation of physical and chemical processes in materials.

BESSY II is THE soft X-ray synchrotron in Germany

With its focus on soft X-rays, BESSY II is unique in Germany. In this sense, the facility is the complement to PETRA III of DESY in Hamburg, which serves the hard X-ray spectrum. More than 1400 guest researchers use BESSY II each year, and appreciate the high reliability and stability of the photon source. The users work on some 50 beamlines, each of which offers the latest methods in spectroscopy and microscopy. BESSY II has an outstanding international reputation for its method development.

Strong in partnership

HZB has strong partners engaged in the continual advancement of BESSY II. Strategic partners include the Physikalisch-Technische Bundesanstalt (PTB), the Max Planck Society, the Bundesanstalt für Materialforschung (BAM) and as well as many research groups at universities, all of whom are forever contributing new ideas.

Lange Nacht der Wissenschaften 2018 at HZB Adlershof

BESSY II can be visited on the Lange Nacht der Wissenschaften © HZB / M. Setzpfandt

Aerial view from BESSY II in 2018

Aerial view of BESSY II at the Wilhelm-Conrad-Röntgen Campus of HZB in Berlin Adlershof © HZB/Dirk Laubner

Optimal conditions for time-resolved experiments

BESSY II furthermore offers extremely exciting possibilities for time-resolved experiments. With the development of low-alpha mode, researchers can study materials with very short light pulses (2 picoseconds). The femtoslicing source at BESSY II is the most successful of its kind in the world. Currently, HZB is using this long-standing experience in time-resolved experimentation to accomplish a worldwide unique upgrade of BESSY II.

BESSY VSR: Short and long light pulses

By 2023, BESSY II will have been upgraded into a variable pulse length storage ring. In future, for each experiment, researchers will be able to choose between short light pulses (1.5 picoseconds) and longer light pulses (15 picoseconds) – without any loss in light intensity. That does not exist at any other synchrotron source in the world.