The magnetic system for water applications consists of solenoidal (doughnut shaped) magnets that are coupled together in groups of six to form a module. Several modules are connected together to form an electromagnetic-boom (e-boom) structure. The system can be made longer or shorter by adding or removing modules to accommodate the situation. Every magnet in the structure is separated from the next by a fixed distance that optimizes the “gradient” effect of the magnetic fields between them. Photo: Reidar Hahn, Fermilab