DOIAbstract
Discusses the plans of Western Europe and the US for stationary target machines and for colliding beam devices. It is technologically simpler to accelerate protons rather than electrons to a given energy. Thus so far proton machines, e.g. ISR at CERN, ISABELLE at Brookhaven, have reached the highest energies. However the phenomena produced in electron-positron collisions are easy to interpret. Three new ideas- collective accelerators, laser accelerators and single-pass colliders- are discussed. (0 refs)
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