Influence of the radio frequency ponderomotive force on anomalous impurity transport in tokamaks
- Department of Radio and Space Science, Chalmers University of Technology, Euratom-VR Association, SE-412 96 Goeteborg (Sweden)
- Institute for Plasma Research, Bhat, Gandhinagar-382 428 (India)
- Association Euratom-CEA, CEA/DSM/IRFM CEA-Cadarache (France)
- Department of Applied Mathematics, University of Sheffield, Hicks Building, Hounsfield Road, S3 7RH Sheffield (United Kingdom)
- Institute for Plasma Physics, Forschungszentrum Juelich GmbH, Association FZJ-Euratom, 52425, Juelich (Germany)
Trace impurity transport in tokamaks is studied using an electrostatic, collisionless fluid model for ion-temperature-gradient and trapped-electron mode driven turbulence in the presence of radio frequency (rf) fields, and the results are compared with neoclassical predictions. It is shown that the inward impurity convective velocity (pinch) that is usually obtained can be reduced by the rf fields, in particular close to the wave resonance location where the rf ponderomotive force may be significant. However, the impurity diffusivity and convective velocity are usually similarly affected by the ponderomotive force, and hence the steady-state impurity density peaking factor -{nabla}n{sub z}/n{sub z} is only moderately affected by the rf fields.
- OSTI ID:
- 21120248
- Journal Information:
- Physics of Plasmas, Vol. 15, Issue 4; Other Information: DOI: 10.1063/1.2908354; (c) 2008 American Institute of Physics; Country of input: International Atomic Energy Agency (IAEA); ISSN 1070-664X
- Country of Publication:
- United States
- Language:
- English
Similar Records
Analytical impurity transport model: Coupling between particle and charge state transports in tokamak plasmas
Two- and three-dimensional tokamak equilibrium modifications driven by the localized ponderomotive force of applied radio frequency waves