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The Large Hadron Collider is a particle accelerator at CERN using two counter-circulating beams in a roughly 27-kilometre underground ring. It collides protons and can also operate with heavy ions. Superconducting magnets steer and focus the beams, while radiofrequency electric fields add energy along their direction of motion.[ref]
Large Hadron Collider by CERN. Accelerator description: ring, beam types, magnets and accelerating structures
The functional division matters: an ideal static magnetic field bends a particle's momentum without doing work, while the accelerating electric field changes its kinetic energy. ATLAS experiment and Compact Muon Solenoid surround collision points and reconstruct outgoing products; the accelerator itself supplies the incoming beams rather than measuring every final particle.
The Large Hadron Collider (LHC) is the world's largest and most powerful particle accelerator, located at CERN (the European Organization for Nuclear Research) near Geneva, Switzerland. It spans a circumference of about 27 kilometers (approximately 17 miles) and is situated underground. The LHC is designed to collide protons and heavy ions at very high energies, enabling physicists to explore fundamental questions about the nature of matter, the forces of the universe, and the basic building blocks of existence.