Nonlinear excitation of geodesic acoustic mode by collisionless trapped electron mode

Zhiyong Qiu, Liu Chen, Fulvio Zonca

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Abstract

Excitation of geodesic acoustic mode (GAM) by collisionless trapped electron mode (CTEM) is studied within the framework of nonlinear gyrokinetic theory. The dispersion relation describing GAM excitation by drift wave turbulence valid for arbitrary k⊥ρi is derived. Here, k⊥ and ρi are, respectively, perpendicular wave vector and thermal ion Larmor radius. It is found that the parametric decay process of CTEM into a GAM and a CTEM sideband is unstable in both small and large k⊥ρi regimes due to, respectively, ion and trapped electron nonlinearity. For moderate k⊥ρi, however, there exists a negligible-GAM-excitation state where ion and trapped electron nonlinearities cancel each other. © 2014 IAEA, Vienna.
Original languageEnglish
Article number033010
Pages (from-to)-
JournalNuclear Fusion
Volume54
Issue number3
DOIs
Publication statusPublished - Mar 2014
Externally publishedYes

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All Science Journal Classification (ASJC) codes

  • Nuclear and High Energy Physics
  • Condensed Matter Physics

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