Premium
Simulation Study of Nonlocal Transport from Edge to Core in Tokamak Plasmas
Author(s) -
Yagi M.,
Matsuyama A.,
Miyato N.,
Takizuka T.
Publication year - 2014
Publication title -
contributions to plasma physics
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.531
H-Index - 47
eISSN - 1521-3986
pISSN - 0863-1042
DOI - 10.1002/ctpp.201410042
Subject(s) - tokamak , physics , toroid , plasma , ballooning , magnetohydrodynamics , enhanced data rates for gsm evolution , core (optical fiber) , resistive touchscreen , pedestal , toroidal and poloidal , turbulence , mechanics , atomic physics , computational physics , nuclear physics , optics , telecommunications , electrical engineering , archaeology , computer science , history , engineering
The simulation study of nonlocal transport from edge to core in tokamak plasmas is performed using the 4‐field reduced MHD model. A toroidally‐elongated cylindrical particle source is applied in the plasma edge, after saturation of the resistive ballooning turbulence is attained. After a short time, the source is switched off and plasma response is investigated in detail. The nonlocal transport appears at the location far from the edge source. It is found that the particle source induces (0,0) and (±1, 0) modes of density fluctuations, where ( m, n ) indicates the set of poloidal mode number m and the toroidal mode number n . These modes interact with each other by the nonlinear and/or toroidal couplings. The symmetry of (±1, 0) modes breaks after switching‐off the source and the formation of the spiral structure with poloidal rotation is observed, which yields a connection between core and edge regions. In this simulation, the convective cell mode such as (1,0) mode contributes the nonlocal transport. The simulation result indicates that two dimensional transport plays an essential role to produce the nonlocal transport. (© 2014 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim)