Energetic-particle-induced geodesic acoustic mode.
Phys Rev Lett
; 101(18): 185002, 2008 Oct 31.
Article
em En
| MEDLINE
| ID: mdl-18999836
ABSTRACT
A new energetic particle-induced geodesic acoustic mode (EGAM) is shown to exist. The mode frequency and mode structure are determined nonperturbatively by energetic particle kinetic effects. In particular the EGAM frequency is found to be substantially lower than the standard GAM frequency. The radial mode width is determined by the energetic particle drift orbit width and can be fairly large for high energetic particle pressure and large safety factor. These results are consistent with the recent experimental observation of the beam-driven n=0 mode in DIII-D.
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MEDLINE
Idioma:
En
Revista:
Phys Rev Lett
Ano de publicação:
2008
Tipo de documento:
Article