Observations of Toroidal Coupling for Low-<span class="aps-inline-formula"><math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><mi>n</mi></math></span> Alfvén Modes in the TCA Tokamak

K. Appert; G. A. Collins; F. Hofmann; R. Keller; A. Lietti; J. B. Lister; A. Pochelon; L. Villard

doi:10.1103/PhysRevLett.54.1671

Observations of Toroidal Coupling for Low- $n$ Alfvén Modes in the TCA Tokamak

K. Appert, G. A. Collins, F. Hofmann, R. Keller, A. Lietti, J. B. Lister, A. Pochelon, and L. Villard

Phys. Rev. Lett. 54, 1671 – Published 15 April 1985

Abstract

The antenna structure in the TCA tokamak is phased to excite preferentially Alfvén waves with known toroidal and poloidal wave numbers. Surprisingly, the loading spectrum includes both discrete and continuum modes with poloidal wave numbers incompatible with the antenna phasing. These additional modes, which are important for our heating experiments, can be attributed to linear mode coupling induced by the toroidicity of the plasma column, when we take into account ion-cyclotron effects.

Received 21 November 1984

DOI:https://doi.org/10.1103/PhysRevLett.54.1671

Authors & Affiliations

K. Appert, G. A. Collins, F. Hofmann, R. Keller, A. Lietti, J. B. Lister, A. Pochelon, and L. Villard

Centre de Recherches en Physique des Plasmas, Association Euratom-Confédération Suisse, Ecole Polytechnique Fédérale de Lausanne, CH-1007 Lausanne, Switzerland