Synchrotron Radiation Source BESSY II

Being Germany’s only third generation XUV-light source gives BESSY II a unique position in the scientific landscape. The storage ring BESSY II is extremely flexible by using low-alpha operation mode and superconducting insertion devices. Starting in the THz region the energy range spans more than eight orders of magnitude and reaches into the hard X-ray regime delivering synchrotron radiation to some 50 experimental stations.

Our ongoing goal is to examine the complete light source facility and all components in the chain of SR-light generation, to significantly improve its performance and optimize it for the needs of the BESSY II user community. Currently we work on several pojects:

Pre-Injector Linac for BESSY II

The increasing user demands for constant current (Top-Up operation) and a variety of fill pattern can be met by the possibility to inject into single rf buckets. This requires a LINAC as a pre-accelerator for the booster synchrotron.

Fast Orbit and bunch-by-bunch Feedback

The concentration of almost 50 experimental stations in the experimental hall increases environmental noise, thereby adversely affecting the resolution and stability of measurement setups. A joint task force of the accelerator and experimental divisions are identifying the sources of electron and photon beam instabilities in order to improve resolution and stability.

Top-up Operation

In the Top-Up operation lost electrons are replaced continuously after minutes rather than every eight hours in order to keep a nearly constant beam current. Within this program, the accelerator facility is currently being upgraded to allow for the Top-Up operaton.