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Simulation Study of Nonlocal Transport from Edge to Core in Tokamak Plasmas

Authors :
Masatoshi Yagi
Tomonori Takizuka
N. Miyato
Akinobu Matsuyama
Source :
Contributions to Plasma Physics. 54:363-367
Publication Year :
2014
Publisher :
Wiley, 2014.

Abstract

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)

Details

ISSN :
08631042
Volume :
54
Database :
OpenAIRE
Journal :
Contributions to Plasma Physics
Accession number :
edsair.doi...........509cbfd6133808088b3763d0e0691bd8
Full Text :
https://doi.org/10.1002/ctpp.201410042