TY - GEN
T1 - Trapping of turbulence clumps by geodesic acoustic modes
AU - Sasaki, Makoto
N1 - Funding Information:
This article is dedicated to Prof. K. Itoh and Prof. S.-I. Itoh on occasion of their retirements. This work was partly supported by a grant-in-aid for scientific research of JSPS, Japan (15H02155, 16K18335, 16H02442, 17H06089) and by the collaboration programs of NIFS (NIFS15KNST089, NIFS17KNST122) and of the RIAM of Kyushu University.
PY - 2018/8/1
Y1 - 2018/8/1
N2 - 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.
AB - 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.
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U2 - 10.1063/1.5048717
DO - 10.1063/1.5048717
M3 - Conference contribution
AN - SCOPUS:85051926465
SN - 9780735417090
T3 - AIP Conference Proceedings
BT - Front-runners' Symposium on Plasma Physics in Honor of Professors Kimitaka Itoh and Sanae-I. Itoh
A2 - Todo, Yasushi
A2 - Ida, Katsumi
PB - American Institute of Physics Inc.
T2 - Front-runners� Symposium on Plasma Physics in Honor of Professors Kimitaka Itoh and Sanae-I. Itoh, 2018
Y2 - 11 January 2018
ER -