 The layout would be the same as the stabilized pinch concept, but the role of the two fields would be reversed.Instead of weak external fields providing stabilization and a strong pinch current responsible for confinement, in the new layout, the external magnets would be much more powerful in order to provide the majority of confinement, while the current would be much smaller and responsible for the stabilizing effect.In 1955, with the linear approaches still subject to instability, the first toroidal device was built in the USSR.