Modelling toroidal rotation damping in ITER due to external 3D fields
Artikel i vetenskaplig tidskrift, 2015

The linear and quasi-linear plasma response to the n = 3 and n = 4 (n is the toroidal mode number) resonant magnetic perturbation (RMP) fields, produced by the in-vessel edge localized mode control coils, is numerically studied for an ITER 15MA H-mode baseline scenario. Both single fluid and fluid-kinetic hybrid models are used. The inclusion of drift kinetic effects does not strongly alter the plasma response compared to the fluid approximation for this ITER plasma. The full toroidal drift kinetic model is also used to compute the neoclassical toroidal viscous (NTV) torque, yielding results close to that of an analytic model based on geometric simplifications. The computed NTV torque from low-n RMP fields is generally smaller than the resonant electromagnetic torque for this ITER plasma. The linear response computations show a weak core kink response, contrary to a strong kink response often computed for plasmas from present day tokamak devices. Initial value quasi-linear simulations, including various torque models, show a localized damping of the plasma toroidal flow near the edge, as a result of the applied RMP fields. This localized rotation damping can be weak or strong depending on whether a weakly unstable edge localized peeling mode is present. No qualitative difference is found between the n = 3 and n = 4 RMP field configurations, in both the linear and non-linear response results.

single fluid models

RMP fields

MHD-kinetic hybrid models

momentum flux

Författare

Yueqiang Liu

Chalmers, Rymd- och geovetenskap, Plasmafysik och fusionsenergi

R. Akers

Culham Lab

I. T. Chapman

Culham Lab

Y. Gribov

ITER

G. Z. Hao

Southwestern Institute of Physics China

G. T. A. Huijsmans

ITER

A. Kirk

Culham Lab

A. Loarte

ITER

S. D. Pinches

ITER

M. Reinke

University of York

D. Ryan

University of York

Y. Sun

Institute of Plasma Physics Chinese Academy of Sciences

Z. R. Wang

Princeton Plasma Physics Laboratory

Nuclear Fusion

0029-5515 (ISSN)

Vol. 55

Ämneskategorier

Fusion, plasma och rymdfysik

DOI

10.1088/0029-5515/55/6/063027