Simulation study on nonlocal transport for peripheral density source

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

The nonlocal transport for peripheral density source is investigated by using 4-field reduced MHD model. The spherical particle source with a small diameter is applied in the plasma edge region, just after the quasi-steady state of resistive ballooning turbulence is attained. Then, the plasma transport is observed. The nonlocal transport appears at the location far from the edge source region. It is found that applying the particle source induces (0,0) and (1,0) modes of density fluctuations as well as (2,1), (3,1) modes, where (,) indicates the set of poloidal mode number m and the toroidal mode number . (0,0) and (1,0) modes dominantly interact with each other by the convective nonlinearity and/or toroidal couplings. The formation of the spiral structure with poloidal rotation is observed, which makes a connection with core and edge regions.