 HERA (particle accelerator)

HERA, which stands for the Hadron-Electron Ring Assembly, was a particle accelerator located at the DESY (Deutsches Elektronen-Synchrotron) laboratory in Hamburg, Germany. It operated from 1992 until 2007 and is known for colliding electrons or positrons with protons (or nuclear matter), facilitating a range of experiments in high-energy physics.