Experimental studies on fast-ion transport by Alfven wave avalanches on the National Spherical Torus Experiment

被引：62

作者：

Podesta, M. ^{[1
]}

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

Liu, D. ^{[1
]}

Ruskov, E. ^{[1
]}

Bell, R. E. ^{[2
]}

Darrow, D. S. ^{[2
]}

Fredrickson, E. D. ^{[2
]}

Gorelenkov, N. N. ^{[2
]}

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

LeBlanc, B. P. ^{[2
]}

Medley, S. S. ^{[2
]}

Roquemore, A. L. ^{[2
]}

Crocker, N. A. ^{[3
]}

Kubota, S. ^{[3
]}

Yuh, H. ^{[4
]}

机构：

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

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

[3] Univ Calif Los Angeles, Los Angeles, CA 90095 USA

[4] Nova Photon, Princeton, NJ 08543 USA

来源：

PHYSICS OF PLASMAS | 2009年 / 16卷 / 05期

关键词：

plasma Alfven waves; plasma magnetohydrodynamic waves; plasma toroidal confinement; plasma transport processes; PHYSICS; PREDICTIONS; INSTABILITY; EIGENMODES;

D O I：

10.1063/1.3080724

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：

Fast-ion transport induced by Alfven eigenmodes (AEs) is studied in beam-heated plasmas on the National Spherical Torus Experiment [Ono , Nucl. Fusion 40, 557 (2000)] through space, time, and energy resolved measurements of the fast-ion population. Fast-ion losses associated with multiple toroidicity-induced AEs (TAEs), which interact nonlinearly and terminate in avalanches, are characterized. A depletion of the energy range >20 keV, leading to sudden drops of up to 40% in the neutron rate over 1 ms, is observed over a broad spatial range. It is shown that avalanches lead to a relaxation of the fast-ion profile, which in turn reduces the drive for the instabilities. The measured radial eigenmode structure and frequency of TAEs are compared with the predictions from a linear magnetohydrodynamics stability code. The partial disagreement suggests that nonlinearities may compromise a direct comparison between experiment and linear theory.

引用

页数：8

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