Simulation study of nonlocal transport from edge to core in tokamak plasmas

Yagi, Masatoshi; Matsuyama, Akinobu; Miyato, Naoaki; Takizuka, Tomonori*

In this work, the simulation study of nonlocal transport from edge to core in tokamak plasmas has been performed using 4-field reduced MHD model. The cylindrical particle source is applied in the plasma edge, after the steady state of resistive ballooning turbulence is attained. After a short time, the source is switched off and the plasma response is investigated. It is found that applying the particle source induces (0,0) and (1,0) modes of density fluctuations, where () indicates the set of poloidal mode number and the toroidal mode number n. These modes interact with each other by the nonlinear and/or toroidal couplings. The convective cell mode such as (1,0) mode is attributed to the nonlocal transport instead of the long-range fluctuation such as (1,1) mode excited by the turbulence. The simulation result indicates that two-dimensional transport in the poloidal plane plays a key role to describe the nonlocal transport.