These posses large circumfrential currents, which differentiates them from stellerators, and are closed, which differentiates them from mirrors or pinches. They were developed at Kurchatov Institute by Artsimovich and there are roughly 25 of these in operation in the world, the Alcator C-Mod and JET being the most powerful. None can operate without significant energy input, but ITER, scheduled to 
These posses large circumfrential currents, which differentiates them from stellerators, and are closed, which differentiates them from mirrors or pinches. They were developed at Kurchatov Institute by Artsimovich and there are roughly 25 of these in operation in the world, the Alcator C-Mod and JET being the most powerful. None can operate without significant energy input, but ITER, scheduled to go operational in 2016, is an international collaboration to build one of these machines which may be able to sustain its own temperature. The Lorentz effect is used to confine plasma using a toroidal magnetic field in, FTP, what machines important to research on nuclear fusion?
These posses large circumfrential currents, which differentiates them from stellerators, and are closed, which differentiates them from mirrors or pinches.
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