Timeline

Heritage classified

Key figures

Origin and history

The Orsay Collision Ring (ACO) is a particle accelerator built in the second half of the 20th century on the Orsay University Centre in Bures-sur-Yvette (Essonne). With its seven metres in diameter, it represents a major advance in atomic and subatomic research. It was designed as the first operational collision ring in France, the result of a collaboration between the d-Orsay and Saclay teams from 1967 onwards. Its architecture and role make it a direct ancestor of the great modern accelerators.

ACO operated from 1967 to 1976 as a collision ring and from 1976 to 1988 for synchrotron radiation experiments. These two phases marked key steps in the study of particles and properties of matter. The entire device, including the ring, its base, as well as the concrete walls and roofs of the experiment room, was inscribed in the historic monuments by decree of 7 March 2002, thus recognizing its heritage and scientific importance.

The ACO illustrates the French technological innovation of the 1960s and 1980s, a period when nuclear and physical research on particulate matter grew significantly. Its inscription as a historical monument highlights its dual heritage: scientific, as a pioneering tool, and architectural, as a testimony of infrastructures dedicated to fundamental research. Today, he embodies both an industrial heritage and a symbol of the progress of experimental physics in Île-de-France.

External links