Internal kink mode dynamics in high-β NSTX plasmas

被引：84

作者：

Menard, JE

Bell, RE

Fredrickson, ED

Gates, DA

Kaye, SM

LeBlanc, BP

Maingi, R

Medley, SS

Park, W

Sabbagh, SA

Sontag, A

Stutman, D

Tritz, K

Zhu, W

机构：

[1] Princeton Plasma Phys Lab, Princeton, NJ 08543 USA

[2] Oak Ridge Natl Lab, Oak Ridge, TN USA

[3] Columbia Univ, New York, NY USA

[4] Johns Hopkins Univ, Baltimore, MD USA

来源：

NUCLEAR FUSION | 2005年 / 45卷 / 07期

关键词：

D O I：

10.1088/0029-5515/45/7/001

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：

Saturated internal kink modes have been observed in many of the highest toroidal beta discharges of the National Spherical Torus Experiment (NSTX). These modes often cause rotation flattening in the plasma core, can degrade fast-ion confinement and in some cases contribute to the complete loss of plasma angular momentum and stored energy. Characteristics of the modes are measured using soft x-ray, kinetic profile and magnetic diagnostics. Toroidal flows approaching Alfvenic speeds, island pressure peaking and enhanced viscous and diamagnetic effects associated with high-beta may contribute to mode nonlinear stabilization. These saturation mechanisms are investigated for NSTX parameters and compared with experimental data.

引用

页码：539 / 556

页数：18

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