Identification of Zonal Flows and Their Spatial Distribution in the TJ-II Stellarator Plasmas

被引：5
|
作者：
Sarancha, G. A. [1 ,2 ]
Eliseev, L. G. [1 ]
Khabanov, Ph O. [1 ]
Kharchev, N. K. [1 ,4 ]
Melnikov, A., V [1 ,2 ,3 ]
机构：
[1] Natl Res Ctr, Kurchatov Inst, Moscow 123182, Russia
[2] Moscow Inst Phys & Technol NRU, Dolgoprudnyi 141701, Russia
[3] Natl Res Nucl Univ MEPhI, Moscow 115409, Russia
[4] Russian Acad Sci, Prokhorov Gen Phys Inst, Moscow 119991, Russia
来源：
JETP LETTERS | 2022年 / 116卷 / 02期
关键词：
GEODESIC ACOUSTIC MODES;
D O I：
10.1134/S0021364022601178
中图分类号：
O4 [物理学];
学科分类号：
0702 ;
摘要：
For low-frequency (0 < f < 20 kHz) plasma electric potential oscillations, measured in two toroidally spaced vertical cross-sections of the TJ-II stellarator (R = 1.5 m, a = 0.22 m, B = 1T) using double heavy ion beam probe diagnostics, long-range correlations are observed, as well as their toroidal and poloidal symmetry n = m = 0. It is shown that long-range correlations do not have a magnetic or density component. Thus, the low-frequency symmetric structures of the electric potential found in the hot plasma area are zonal flows. Their quantitative characteristic is the square coherence coefficient gamma(2). For the first time a two-dimensional map of zonal flows (long-range correlations) in the low-density (n) over bar (e) = 0.5 center dot 10(19) m(-3) regime with ECR heating was plotted and their ballooning structure (dominance gamma (2) on the low field side of the vessel) was found. The decrease in the level of electrostatic turbulence (0 < f < 300 kHz) observed in this region is consistent with the theoretically predicted suppression of broadband turbulence due to zonal flows.
引用
收藏
页码：98 / 104
页数：7
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