The localization of low order rational surfaces based on the intermittence parameter in the TJ-II stellarator

被引：5
|
作者：
van Milligen, B. Ph. [1 ]
Carreras, B. A. [2 ,3 ]
Garcia, L. [2 ]
Hidalgo, C. [1 ]
Team, The
机构：
[1] CIEMAT, Natl Fus Lab, Madrid, Spain
[2] Univ Carlos III Madrid, Dept Fis, Madrid, Spain
[3] Univ Alaska, Dept Phys, Fairbanks, AK 99775 USA
来源：
NUCLEAR FUSION | 2020年 / 60卷 / 05期
关键词：
magnetic confinement; stellarator; turbulence; rational surfaces; EDGE; CONFINEMENT;
D O I：
10.1088/1741-4326/ab79cc
中图分类号：
O35 [流体力学]; O53 [等离子体物理学];
学科分类号：
070204 ; 080103 ; 080704 ;
摘要：
This work intends to show that the multifractal concept of intermittence can be fruitfully applied to the identification of the radial location of low order rational surfaces inside a magnetically confined plasma. To do so, we make use of Langmuir probe data from a set of experiments in which the rotational transform was scanned dynamically in the TJ-II stellarator. It is shown that up to five rational surfaces can be identified from the data, which is a first in plasma physics, to the best of our knowledge. The effect of the radial electric field on intermittence was also studied using a specific subset of experiments in which the electron density was raised on a shot by shot basis. The observations are contrasted with results from numerical calculations using a resistive magneto-hydrodynamic model to facilitate interpretation.
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页数：10
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