Community Research and Development Information Service - CORDIS

Abstract

An equation of shear AlfvÚn eigenmodes (AE) for Helias configurations is derived. The metric tensor coefficients, which are contained in this equation, are calculated analytically. Two numerical codes are developed: the first one, COBRA (COntinuum BRAnches), is intended for the investigation of the structure of AlfvÚn continuum; the second, BOA (Branches Of AlfvÚn modes), solves the eigenvalue problem. The family of possible gaps in AlfvÚn continuum of a Helias configuration is obtained. It is predicted that there exist gaps which arise due to or are strongly affected by the variation of the shape of the plasma cross section along the large azimuth of the torus. In such gaps, discrete eigenmodes, namely, helicity-induced eigenmodes (HAE21) and mirror-induced eigenmodes (MAE) are found. It is shown that the combined action of the weak magnetic shear and the low plasma density at the edge may surpress the AEs with a wide region of localization. In addition to the AEs residing in the continuum gaps, global AEs (GAE) are studied.

Additional information

Authors: KOLESNICHENKO Y I, Scientific Centre, Institute for Nuclear Research, Kyiv (UA);LUTSENKO V V, Scientific Centre, Institute for Nuclear Research, Kyiv (UA);YAKOVENKO Y V, Scientific Centre, Institute for Nuclear Research, Kyiv (UA);FESENYUK O P, Scientific Centre, Institute for Nuclear Research, Kyiv (UA);WOBIG H, Max-Planck-Institut f³r Plasmaphysik, EURATOM-Association, Garching bei M³nchen (DE)
Bibliographic Reference: Report: IPP III/261 EN (2000) 65 pp.
Availability: Available from Max-Planck-Institute, Garching bei M³nchen (DE)
Follow us on: RSS Facebook Twitter YouTube Managed by the EU Publications Office Top