90 years of RF Accelerators

In 1927 Rolf Wideröe completed his seminal doctoral thesis in Aachen, Germany. 2017 was the 90 year anniversary of the first linear RF accelerator, constructed by Wideröe in Aachen, and of his visionary idea for a circular accelerator. DESY and RWTH Aachen invited to a high level symposium to mark this anniversary and the subsequent achievements in our accelerator community: Symposium "90 Years of RF Accelerators" Commemorating the 1927 PhD of Rolf Wideröe at Aachen, Germany.The half-day symposium celebrated this event with talks on the history and modern accelerators from the LHC to the XFEL and medical applications. The participants also had a lively discussion on RF accelerators and future developments in the morning of the second day