Kinetic theories of geodesic acoustic modes: Radial structure, linear excitation by energetic particles and nonlinear saturation

Zhiyoung Qiu, Fulvio Zonca, Liu Chen

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Geodesic acoustic modes (GAMs) are oscillating zonal mode structures unique to toroidal plasmas and are capable of regulating microscopic turbulence and associated transports. In this paper, three important aspects of GAM dynamics are investigated, namely (1) GAM continuous spectrum and its mode conversion to kinetic GAM (KGAM); (2) linear excitation of energetic particle induced GAM (EGAM) and its coupling to the GAM continuum, and (3) nonlinear saturation of EGAM via wave particle trapping. The analogy between the GAM-EGAM dynamics and the well known beam-plasma instability are also discussed.
Original languageEnglish
Pages (from-to)257 - 266
Number of pages10
JournalPlasma Science and Technology
Issue number3
Publication statusPublished - Jun 2011
Externally publishedYes


All Science Journal Classification (ASJC) codes

  • Condensed Matter Physics

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