Abstract
Principal properties of the magnetic helicity are reviewed with pointing out its basic roles in the fusion plasma theory. Approximate conservation of the total helicity in a toroidal plasma characterizes a typical MHD relaxation process which leads to a force-free plasma equilibrium. The distribution of the plasma current is determined by the helicity transport. Transformer induction injects helicity flux into a toroidal plasma system. Oscillating field can also transport the helicity with driving a parallel (force-free) current.
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