50th anniversary of Hadron Colliders at CERN (ISR50)

On 27 January 1971, beams collided for the first time in the world’s first hadron collider, the Intersecting Storage Rings (ISR), changing the course of high energy particle physics forever. By 18 May, beams were colliding at the design energy of 26.5 GeV/beam, and by 2 July, the ISR's first results were ready for presentation at the International Conference on Elementary Particles in Amsterdam. Fifty years later, there have been five hadron colliders in the world, three at CERN and two in the US, each of which has enriched the sum of human knowledge and contributed to innovation in numerous ways. The 50th anniversary is an opportunity to look back on the achievements of past and current machines to lay the foundations for future hadron colliders and was celebrated with speeches from personalities including Frédéric Bordry, Joachim Mnich, Carlo Rubbia, Steve Myers, Ugo Amalidi, Lyn Evans, Felicitas Pauss, Chris Lllewellyn Smith, Alice Ohlson, Patrick Rieck, Abideh Jafari, Basem Khanji, Young-Kee Kim and Fabiola Gianotti.