A theory to describe basic characterization of ion temperature gradient driven turbulence with strong trapped ion resonance is presented. The role of trapped ion granulations, clusters of trapped ions correlated by precession resonance, is the focus. Microscopically, the presence of trapped ion granulations leads to a sharp (logarithmic) divergence of two point phase space density correlation at small scales. Macroscopically, trapped ion granulations excite potential fluctuations that do not satisfy dispersion relation and so broaden frequency spectrum. The line width from emission due only to trapped ion granulations is calculated. The result shows that the line width depends on ion free energy and electron dissipation, which implies that non-adiabatic electrons are essential to recover non-trivial dynamics of trapped ion granulations. Relevant testable predictions are summarized.
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October 2014
Research Article|
October 07 2014
Ion temperature gradient driven turbulence with strong trapped ion resonance
Y. Kosuga;
Y. Kosuga
a)
1Institute for Advanced Study,
Kyushu University
, Fukuoka, Japan
2Research Institute for Applied Mechanics,
Kyushu University
, Fukuoka, Japan
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S.-I. Itoh;
S.-I. Itoh
2Research Institute for Applied Mechanics,
Kyushu University
, Fukuoka, Japan
3Research Center for Plasma Turbulence,
Kyushu University
, Fukuoka, Japan
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P. H. Diamond;
P. H. Diamond
4CASS and CMTFO,
University of California at San Diego
, La Jolla, California 92093, USA
5WCI Center for Fusion Theory,
National Fusion Research Institute
, Daejeon, South Korea
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K. Itoh;
K. Itoh
3Research Center for Plasma Turbulence,
Kyushu University
, Fukuoka, Japan
6
National Institute for Fusion Science
, Gifu, Japan
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M. Lesur
M. Lesur
2Research Institute for Applied Mechanics,
Kyushu University
, Fukuoka, Japan
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a)
Electronic mail: kosuga@riam.kyushu-u.ac.jp
Phys. Plasmas 21, 102303 (2014)
Article history
Received:
May 21 2014
Accepted:
September 17 2014
Citation
Y. Kosuga, S.-I. Itoh, P. H. Diamond, K. Itoh, M. Lesur; Ion temperature gradient driven turbulence with strong trapped ion resonance. Phys. Plasmas 1 October 2014; 21 (10): 102303. https://doi.org/10.1063/1.4897179
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