Accretion theory of 'spontaneous' rotation in toroidal plasmas

摘要

The accretion theory of 'spontaneous' toroidal rotation connects this phenomenon to the energy and particle transport properties of the plasma column and to the relevant collective models. The consequent prediction that an inversion of the velocity direction in the transition from the H to the L regime should occur has been verified by the experiments. The theory is consistent also with the observation that the velocity is depressed when a peaked density profile appears As a result of a transport barrier. The fact that the rotation velocity increases with the total energy content is explained By the fact that the inflow of angular momentum, whose source is at the edge of the plasma column, results from The excitation of modes driven by the plasma pressure gradient.