Trapping of turbulence clumps by geodesic acoustic modes

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Abstract

Dynamics of drift wave turbulence interacting with geodesic acoustic modes (GAMs) is investigated, focusing on the turbulence trapping in a phase space (real-space and wavenumber-space). Based on the wave-kinetic theory, we consider the dynamics of the turbulence coupling with the GAMs for two limiting cases; one is the case of GAMs driven by the turbulence, and the another is the case of the GAMs driven by energetic particles (EGAMs). For the case of the turbulence driven GAMs, the turbulence intensity is modulated spatially and temporally due to the trapping effect. The turbulence trapping significantly affects the spatial profile of the turbulence: The turbulence exclusion occurs at the positive curvature region, and the turbulence accumulation is significant at the negative curvature region. Their relation is kept with the propagation. It is also shown that the trapped turbulence by the EGAMs can be carried nonlocally in space. The trapped turbulence can penetrate the transport barrier and can propagate regions where the turbulence is stable. The turbulence trapping plays important roles for the nonlocal propagation of the turbulence and for determining the spatial profile of the turbulence intensity.

Original languageEnglish
Title of host publicationFront-runners' Symposium on Plasma Physics in Honor of Professors Kimitaka Itoh and Sanae-I. Itoh
EditorsYasushi Todo, Katsumi Ida
PublisherAmerican Institute of Physics Inc.
ISBN (Print)9780735417090
DOIs
Publication statusPublished - Aug 1 2018
EventFront-runners� Symposium on Plasma Physics in Honor of Professors Kimitaka Itoh and Sanae-I. Itoh, 2018 - Toki, Gifu, Japan
Duration: Jan 11 2018 → …

Publication series

NameAIP Conference Proceedings
Volume1993
ISSN (Print)0094-243X
ISSN (Electronic)1551-7616

Other

OtherFront-runners� Symposium on Plasma Physics in Honor of Professors Kimitaka Itoh and Sanae-I. Itoh, 2018
CountryJapan
CityToki, Gifu
Period1/11/18 → …

All Science Journal Classification (ASJC) codes

  • Physics and Astronomy(all)

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    Sasaki, M. (2018). Trapping of turbulence clumps by geodesic acoustic modes. In Y. Todo, & K. Ida (Eds.), Front-runners' Symposium on Plasma Physics in Honor of Professors Kimitaka Itoh and Sanae-I. Itoh [020007] (AIP Conference Proceedings; Vol. 1993). American Institute of Physics Inc.. https://doi.org/10.1063/1.5048717