Fixed Target
In an fixed target experiment, a beam of accelerated particles is projected on a fixed piece of matter, usually a metal plate. Collisions then occur between some particles and atoms of the target. While the beam-fixed target collisions are easier to produce than beam-beam collisions, there are two main drawbacks to the fixed target experiment: first, the particles can be used only once; second, only a small part of the energy provided by the beam is effectively used to create new particles.