 Compact toroids, especially the "Field-Reversed Configuration" and the spheromak, attempt to combine the advantages of toroidal magnetic surfaces with those of a simply connected (non-toroidal) machine, resulting in a mechanically simpler and smaller confinement area.Inertial confinement is the use of rapidly imploding shell to heat and confine plasma.The shell is imploded using a direct laser blast (direct drive) or a secondary x-ray blast (indirect drive) or heavy ion beams.