The Antiproton Decelerator (AD) is a storage ring at the CERN laboratory in Geneva. It was built as a successor to the Low Energy Antiproton Ring (LEAR) and started operation in the year 2000. The decelerated antiprotons are ejected to one of several connected experiments.
Read more about Antiproton Decelerator: AD Experiments, ATHENA, ATRAP, ASACUSA, ACE, ALPHA, AEGIS