Implementation and Initial Operation of the Bunch-by-Bunch Feedback System at SOLARIS

The SOLARIS synchrotron light source has commissioned a transverse bunch-by-bunch feedback system designed to suppress coupled-bunch instabilities and serve as a diagnostic tool for accelerator studies. The system was successfully installed and integrated with the existing infrastructure, including timing and control systems. After a series of commissioning steps, it was brought into operation and tested under standard user conditions. Although routine instability suppression is not currently needed during regular operation, the system has been effectively used in dedicated machine studies. It enabled detailed observation of transverse bunch motion, instability spectra, and individual bunch tune measurements. The system also played a crucial role in advanced measurements such as LOCO experiments with selectively emptied buckets and tune shift studies under varying machine conditions. The bunch-by-bunch feedback system significantly enhances the diagnostic and research capabilities at SOLARIS and provides a solid foundation for potential future applications in active beam stabilization.