Nonlocal transport in toroidal plasma devices*

Several heuristic models for nonlocal transport in plasmas have been developed, but there has been little possibility of detailed comparision with experimental data. Collisional particle transport is examined in several toroidal plasma devices in the presence of perturbations typical of modes leading up to a disruption, of saturated tearing modes, or of unstable Alfv ́en modes. The existence of subdiffusive transport for electrons is found to occur in some cases at very low mode amplitudes and to also exist even for ions of high energy.The existence and nature of subdiffusive transport is found to depend on the nature of the mode spectrum and frequency as well as the mode amplitudes.

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