Multiple ion temperature gradient driven modes in transport barriers

The ion temperature gradient (ITG) modes in transport barriers (TBs) of tokamak plasmas are numerically studied with a code solving gyrokinetic integral eigenvalue equations in toroidal configurations. It is found that multiple ITG modes with conventional and unconventional ballooning mode structure...

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Bibliographic Details
Published in:Nuclear fusion 2017-04, Vol.57 (4), p.46019
Main Authors: Han, M.K., Wang, Zheng-Xiong, Dong, J.Q., Du, Huarong
Format: Article
Language:English
Subjects:
ion temperature gradient instability
transport barriers
turbulence
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Summary:The ion temperature gradient (ITG) modes in transport barriers (TBs) of tokamak plasmas are numerically studied with a code solving gyrokinetic integral eigenvalue equations in toroidal configurations. It is found that multiple ITG modes with conventional and unconventional ballooning mode structures can be excited simultaneously in TBs with steep gradients of ion temperature and density. The characteristics of the modes, including the dependence of the mode frequencies, growth rate and structure on plasma parameters, are systematically investigated. Unconventional modes with large mode-number l (where l denotes a certain parity and peak number in ballooning space) dominate in the large kθρs region (kθρs 1.2), while the conventional mode with l=0 dominates in the medium kθρs region (0.4 kθρs
ISSN:0029-5515
1741-4326
DOI:10.1088/1741-4326/aa5d02