Test particle analysis in L- and H-mode simulations.

In this work, the radial transport of tracers in an H-mode run in the CUTIE code [A. Thyagaraja et al., Phys. Plasmas 12, 090907 (2005)] is analyzed globally. Several techniques are applied to the study of the trajectories performed by the tracers, measuring the degree of self-similarity in the motion and searching for long range spatial and temporal correlations. The results are compared to those of an L-mode run [G. Sánchez Burillo et al., Phys. Plasmas 16, 042319 (2009)] in order to highlight the changes between L and H. The analysis of self-similarity parameters of the motion reveals that changes, if any, are slight, although the reliability of the results is limited. Nevertheless, the study of the mean step size indicates that transport is more local (or rather less global) and the anomalous diffusion contribution is less dominant. Namely, the variance of the radial distribution of tracers is smaller in H-mode and the strong asymmetry in the positive/negative steps performed by the tracers vanishes. [ABSTRACT FROM AUTHOR]