To achieve these high energies, the LHC's magnets must be cooled to extremely low temperatures. This is done using liquid helium, which is kept at a temperature of 1.9 K (-271.25 °C). The magnets are then made of superconducting materials, which lose all electrical resistance at very low temperatures. This allows them to carry very high currents without losing energy.
The LHC has a total of 1,232 superconducting magnets. Each magnet is about 15 m (49 ft) long and weighs about 35 tons. They are arranged in eight sectors around the LHC ring.
Each sector of the LHC has two types of magnets: dipole magnets and quadrupole magnets. Dipole magnets create a magnetic field that bends the proton beams around the ring. Quadrupole magnets focus the proton beams, keeping them from spreading out as they travel around the LHC.
The LHC magnets are powered by a system of superconductors and power converters. The superconductors carry the electrical current that creates the magnetic field. The power converters convert the alternating current (AC) from the electrical grid into the direct current (DC) needed by the superconductors.
The LHC's magnets are very sensitive to changes in temperature and magnetic field. To protect them, the LHC has a sophisticated system of sensors that monitor the magnets' conditions. If any of the magnets are damaged, the LHC can shut down automatically to prevent further damage.
The LHC's magnets are a critical part of the accelerator's operation. Without them, the LHC would not be able to reach the high energies needed to study the fundamental particles of nature.
