Abstract
It is shown by three-dimensional magnetohydrodynamic simulations that the toroidal current J z can be induced by a process of relaxation without helicity invariance under a condition of no external magnetic helicity injection. It is shown that the magnetic helicity is induced during relaxation and it is passively determined as a result of the time evolution of the dynamical system. Numerical results suggest that the basic process for the toroidal current drive during relaxation is the nonlinear energy transfer from the toroidal to the poloidal magnetic energy with the intervention of the kinetic energy. It is demonstrated that self-organization to the lower eigenmode with a larger-scale structure occurs during relaxation.
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