Observation of an Energetic-Particle-Driven Instability in the Wall-Stabilized High-β Plasmas in the JT-60U Tokamak

被引：49

作者：

Matsunaga, G. ^{[1
]}

Aiba, N. ^{[1
]}

Shinohara, K. ^{[1
]}

Sakamoto, Y. ^{[1
]}

Isayama, A. ^{[1
]}

Takechi, M. ^{[1
]}

Suzuki, T. ^{[1
]}

Oyama, N. ^{[1
]}

Asakura, N. ^{[1
]}

Kamada, Y. ^{[1
]}

Ozeki, T. ^{[1
]}

机构：

[1] Japan Atom Energy Agcy, Naka, Ibaraki 3110193, Japan

来源：

PHYSICAL REVIEW LETTERS | 2009年 / 103卷 / 04期

关键词：

INTERNAL KINK; MODES; PROFILE; IONS;

D O I：

10.1103/PhysRevLett.103.045001

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

We have observed a bursting mode in the high-beta plasmas above the ideal beta limit without a conducting wall. The mode frequency is chirping down as the mode amplitude increases, and its initial value is close to the precession frequency of the trapped energetic particle from the perpendicular neutral beams. The mode structure is radially extended with a peak around the q = 2 surface. This mode can finally trigger the resistive wall mode (RWM) despite enough plasma rotation for RWM stabilization. It is concluded that the mode is driven by trapped energetic particles. The mode is attributed to the interaction between the trapped energetic particles and a marginally stable mode in the wall-stabilized high-beta(N) region.

引用

页数：4

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