 Positron–Electron Tandem Ring Accelerator

The Positron–Electron Tandem Ring Accelerator (PETRA) is a particle accelerator that was originally designed as a storage ring for electron and positron collisions. Developed at the DESY (Deutsches Elektronen-Synchrotron) laboratory in Hamburg, Germany, PETRA was built to explore the properties of particle collisions at high energies, which are essential for studying fundamental aspects of particle physics.