Proton-antiproton accelerators

It accelerates both protons and antiprotons to an energy of about 1 trillion electron volts (TeV). 

When a particle and its antiparticle, such as an electron and a positron, or a proton and an antiproton, are used in head-on collision experiments, acceleration of the particles can be accomplished in one ring. This is because electrons and positrons, for example, behave m the same way in terms of their response to magnetic and electric fields. Thus, both particles can be injected into the same ring, one to follow an orbit in a clockwise direction the other in a counterclockwise direction. Upon injection of a cluster of each type of particle, collisions occur at two points diametrically opposed. This arrangement provides maximum utilization of the equipment. 

Nuclear physics is concerned with the fundamental nature of matter. The central focuses of this area of study are the relationship between a quantity of energy and its mass, given by = mc, and the fact that matter can be converted from one form (energy) to another (particulate) in particle accelerators. Collisions between high-speed particles have produced a dazzling array of new particles— hundreds of them. These events can best be seen as conversions of kinetic energy into particles. For example, a coUision of sufficient energy between a proton and a neutron can produce four particles two protons, one antiproton, and a neutron ... 

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