The world's largest magnet is called the Central Solenoid. It is located at the heart of the ITER fusion reactor, currently under construction in Cadarache, France. The Central Solenoid is a superconducting magnet, meaning it can generate a very strong magnetic field without losing energy to electrical resistance. It will produce a magnetic field of 13 teslas, which is more than 200,000 times stronger than the Earth's magnetic field. The Central Solenoid is essential for confining the hot plasma fuel inside the ITER reactor and enabling fusion reactions to take place.