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LH-transition dynamics in the presence of GAM and pellet-injection

Improved confinement mode in a toroidal fusion device, or H-mode, is a necessary operational regime for thermonuclear devices. H-mode is characterized with the presence of peripheral transport barrier – an area in which anomalous (or turbulent) transport is suppressed. Turbulence suppression is connected with the existence of strong inhomogeneity (shear) of radial electric field Er. Thus if it is possible to create strong enough inhomogeneous electric field, it is possible to initiate the transition to improved confinement mode (LH-transition). However, there could be other factors responsible for LH-transition initiation possibility. In the present paper two methods of creating strong Er shear are discussed. Geodesic acoustic mode (GAM) creates strong inhomogeneity of radial electric field and transverse rotation and thus affects anomalous transport through control of turbulence level [1]. Cryogenic fuel pellet injection creates localized perturbation of particle source, which leads to density gradient and ion temperature gradient perturbation, which both build up