On the reconstruction of nonlocal heat transport parameters from observed phenomena of the fast non-diffusive transport in a tokamak

Summary form only given, as follows. A physics model for the nonlocal heat transport by long mean-free-path plasma waves-of the order and much larger than plasma characteristic size-and the respective formalism of an integral equation, in space variables, are shown to provide universal explanation of major features of recently observed phenomena of the fast non-diffusive heat transport in a tokamak, which being interpreted in formalisms of diffusion-like, differential equations give instant jumps of thermal diffusivities in a large part of plasma volume. The inverse problem is formulated for reconstructing the parameters of nonlocal component of anomalous cross-field energy transport, and the results of numerical modeling are presented for initial stage of the following phenomena: (i) net inward flux of energy during off-axis heating; (ii) prompt rise/drop of electron temperature in the core in experiments on fast cooling/heating of the periphery; (iii) fast "volumetric" response of energy transport to plasma edge behavior during L-H transitions.