Analysis of magnetohydrodynamic instabilities in TJ-II plasmas

被引：16

作者：

Jimenez-Gomez, R. ^{[1
]}

Ascasibar, E. ^{[1
]}

Estrada, T. ^{[1
]}

Garcia-Cortes, I. ^{[1
]}

Van Milligen, B. ^{[1
]}

Lopez-Fraguas, A. ^{[1
]}

Pastor, I. ^{[1
]}

Lopez-Bruna, D. ^{[1
]}

机构：

[1] CIEMAT, Asociac Euratom, Lab Nacl Fus, E-28040 Madrid, Spain

来源：

FUSION SCIENCE AND TECHNOLOGY | 2007年 / 51卷 / 01期

关键词：

stellarator plasmas; magnetic field fluctuations; MHD instabilities;

D O I：

10.13182/FST07-A1283

中图分类号：

TL [原子能技术]; O571 [原子核物理学];

学科分类号：

0827 ; 082701 ;

摘要：

Magnetohydrodynamic instabilities in the TJ-II stellarator are being experimentally characterized in various plasma parameter regimes and heating scenarios. Magnetic field fluctuations data are collected, using various Mirnov coil sets distributed at different toroidal sectors of the vacuum vessel, with frequency resolution up to 1 MHz. Specific analysis is carried out with the signals from a poloidal array of 15 coils measuring poloidal magnetic field fluctuations. The appearance of low-frequency modes (some tens of kilohertz) in electron cyclotron heated plasmas depends on the rotational transform profile and plasma density. In neutral beam injection plasmas, high-frequency (150- to 300-kHz) modes have been found in plasmas with line densities in the range 0.6 x 10(19) m(-3) to 3 x 10(19) m(-3) and heated with on/off-axis electron cyclotron heating. They are good candidates for global Alfven eigenmodes related to the low-order resonance n/m = 3/2.

引用

页码：20 / 30

页数：11

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