Accelerator Module (2 of 2) (IMAGE) Johannes Gutenberg Universitaet Mainz Caption These are schematics of the MESA accelerator. The green cylinders represent the two accelerator modules. After two full rounds of recirculation, the electron beam reaches an energy of 150 MeV. Credit Ill./©: Institute of Nuclear Physics, JGU Usage Restrictions This image may only be used in connection with the press release 'New electron accelerator at Johannes Gutenberg University Mainz reaches first milestone', issued by Johannes Gutenberg University Mainz on June 15, 2015. License Licensed content Disclaimer: AAAS and EurekAlert! are not responsible for the accuracy of news releases posted to EurekAlert! by contributing institutions or for the use of any information through the EurekAlert system.