A superconducting magnet is an electromagnet made from coils of superconducting wire. They must be cooled tocryogenic temperatures during operation. In its superconducting state the wire can conduct much larger electric currents than ordinary wire, creating intense magnetic fields. Superconducting magnets can produce greatermagnetic fields than all but the strongest electromagnets and can be cheaper to operate because no energy is dissipated as heat in the windings. They are used in MRI machines in hospitals, and in scientific equipment such asNMR spectrometers, mass spectrometers and particle accelerators.