The development of particle accelerators in the 1920–30's was strongly influenced by the availability of intense sources of ions as well as the ability to shape magnetic fields and to produce high electric fields. Later, electron synchrotrons required intense electron sources. Still later the development of electron–positron colliding‐beam machines required positron sources. At present CERN and Fermilab are developing intense sources of antiprotons and related beam‐cooling techniques needed to make intense sources. We expect these antiproton sources to influence the development of future particle accelerators and storage rings just as profoundly as ion, electron and positron sources have in the past. One immediate use for the antiprotons is the creation of high‐energy antiproton–proton colliders.

Topics
Bosons, Electron positron interactions, Electron sources, Particle accelerators, Leptons, Storage rings, Synchrotrons, Colliders
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