Particle accelerators are machines that scientists build to speed particles up and steer them to detectors. Sometimes the machines are built quite big to make the particles go really fast. A device like your microwave oven is used to help speed them up. It is called a Radio Frequency cavity. Large magnets are used to help direct the particles to where you want them. There is a very large laboratory with several accelerators in the United States near Chicago called Fermilab. You can find out more about detectors.