Anomalous impurity transport in tokamaks in the presence of RF fields
Paper in proceedings, 2008

Recent experiments1-4 have shown that auxiliary heating can influence impurity accumulation in Tokamaks. In the present study the transport of impurities by Ion-Temperature-Gradient (ITG) and Trapped-Electron (TE) mode turbulence in the presence of radio frequency (rf) fields in the ion cyclotron range of frequencies is investigated using an electrostatic, collisionless fluid model. The turbulence is affected by the ponderomotive force associated with the rf field of the fast magnetosonic wave in the plasma. It is shown that the inward impurity convective velocity (pinch) and diffusivity can be reduced by the rf field, in particular close to the wave resonance location where the ponderomotive force may be significant. However, the steady state impurity density peaking factor -∇nz/nz does not seem to be as strongly affected by the rf field as indicated by recent tokamak experiments.

Author

Hans Nordman

Chalmers, Department of Radio and Space Science, Transport Theory

R Singh

Tünde Fülöp

Chalmers, Applied Physics, Nuclear Engineering

Chalmers, Department of Radio and Space Science, Non-Linear Electrodynamics

Pär Strand

Chalmers, Department of Radio and Space Science, Transport Theory

L-G Eriksson

R Dumont

M. Tokar

P Kaw

Jan Weiland

Chalmers, Department of Radio and Space Science, Transport Theory

Proceedings of the 35th EPS Conference on Plasma Physics, Hersonissos, Greece, 9-13 June, 2008, ECA

Vol. 32 2 882-885

Driving Forces

Sustainable development

Areas of Advance

Energy

Roots

Basic sciences

Subject Categories

Fusion, Plasma and Space Physics

ISBN

978-162276335-1

More information

Created

10/7/2017