Non-linear wave-particle interactions and fast ion loss induced by multiple Alfven eigenmodes in the DIII-D tokamak

被引：14

作者：

Chen, Xi ^{[1
]}

Kramer, G. J. ^{[2
]}

Heidbrink, W. W. ^{[1
]}

Fisher, R. K. ^{[3
]}

Pace, D. C. ^{[3
]}

Petty, C. C. ^{[3
]}

Podesta, M. ^{[2
]}

Van Zeeland, M. A. ^{[3
]}

机构：

[1] Univ Calif Irvine, Dept Phys & Astron, Irvine, CA 92697 USA

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

[3] Gen Atom Co, San Diego, CA 92186 USA

来源：

NUCLEAR FUSION | 2014年 / 54卷 / 08期

关键词：

non-linear; energetic particles; multi-wave particle interactions; CASCADES; PLASMAS; DRIVEN; MODES;

D O I：

10.1088/0029-5515/54/8/083005

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：

A new non-linear feature has been observed in fast-ion loss from tokamak plasmas in the form of oscillations at the sum, difference and second harmonic frequencies of two independent Alfven eigenmodes (AEs). Full orbit calculations and analytic theory indicate this non-linearity is due to coupling of fast-ion orbital response as it passes through each AE-a change in wave-particle phase k.r by one mode alters the force exerted by the next. The loss measurement is of barely confined, non-resonant particles, while similar non-linear interactions can occur between well-confined particles and multiple AEs leading to enhanced fast-ion transport.

引用

页数：5

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