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A particle accelerator, also called an atom smasher, is a machine that makes really tiny things called particles travel at very high speeds. Accelerators work by pushing particles like electrons, protons, or nuclei with electric fields and by steering them with magnetic fields.
The largest accelerators are used to study subatomic particles; smaller accelerators are used to study atomic nuclei (the big part at the middle of atoms) and make radioactive materials. There are two kinds of particle accelerators: linear accelerators and circular accelerators. Linear accelerators move the particles in a line, while circular accelerators move the particles in a circle. One example of a particle accelerator is the Large Hadron Collider at CERN. It is very big, stretching through two countries. Another example is the Tevatron in the United States.
This helps people see particles smaller than an atom. Normally those particles cannot be seen, but they can in the particle accelerator. This is because in some ways energy and matter are the same thing. At the high speed created in these machines, some of the movement energy is changed into matter. It is the reverse (opposite) process that nuclear weapons use. This being when matter is turned into energy. Small amounts of antimatter are also created during the process.
The particle accelerator at CERN was set up to search for the Higgs Boson particle, which would complete the Standard Model of Particle Physics.
Particle accelerators often use very advanced technology. This makes them cost a lot of money which is usually paid by governments.