Fast Alfven eigenmodes in a cylindrical inhomogeneous plasma

Autor:	Rod Cross, M J Ballico
Rok vydání:	1989
Předmět:	Physics Tokamak business.industry Cyclotron Plasma Condensed Matter Physics Cutoff frequency Computational physics law.invention Magnetic field Optics Nuclear Energy and Engineering Physics::Plasma Physics law Surface wave Dispersion (water waves) business Waveguide
Zdroj:	Plasma Physics and Controlled Fusion. 31:1141-1155
ISSN:	1361-6587 0741-3335
DOI:	10.1088/0741-3335/31/7/009
Popis:	In a cylindrical, plasma-filled waveguide, the fast Alfven mode with the lowest waveguide cutoff frequency or density is the first radial m=+1 mode, where m is the azimuthal mode number. If the plasma is surrounded by a vacuum or low density region, the situation is more complicated. The dispersion properties of positive m modes are particularly sensitive to changes in the edge density profile. It is shown that, at frequencies above the ion cyclotron frequency, first radial positive m modes propagate as surface waves even in plasmas without a well-defined surface. High m>0 modes are guided along steady magnetic field lines at the plasma edge and are therefore potentially very dangerous from an edge heating point of view in ICRF experiments. The results indicate that most fast wave cavity modes, previously observed in small Tokamak devices, have been surface wave modes.
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=doi_________::0935ca02313d78490577fdf7057d9967 https://doi.org/10.1088/0741-3335/31/7/009 Zobrazit plný text záznamu