multipole magnet
magnets built from multiple individual magnets, typically used to control beams of charged particles. Each type of magnet serves a particular purpose
quadrupole magnet
consist of groups of four magnets laid out so that in the planar multipole expansion of the field, the dipole terms cancel and where the lowest significant terms in the field equations are quadrupole
dipole magnet
magnet in which opposite poles are on opposite sides of the magnet