Observation of Critical-Gradient Behavior in Alfven-Eigenmode-Induced Fast-Ion Transport

被引：93

作者：

Collins, C. S. ^{[1
]}

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

Austin, M. E. ^{[2
]}

Kramer, G. J. ^{[3
]}

Pace, D. C. ^{[4
]}

Petty, C. C. ^{[4
]}

Stagner, L. ^{[1
]}

Van Zeeland, M. A. ^{[4
]}

White, R. B. ^{[3
]}

Zhu, Y. B. ^{[1
]}

机构：

[1] Univ Calif Irvine, Irvine, CA 92697 USA

[2] Univ Texas Austin, Austin, TX 78712 USA

[3] Princeton Plasma Phys Lab, POB 451, Princeton, NJ 08543 USA

[4] Gen Atom Co, POB 85608, San Diego, CA 92186 USA

来源：

PHYSICAL REVIEW LETTERS | 2016年 / 116卷 / 09期

关键词：

PLASMA;

D O I：

10.1103/PhysRevLett.116.095001

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

Experiments in the DIII-D tokamak show that fast-ion transport suddenly becomes stiff above a critical threshold in the presence of many overlapping small-amplitude Alfven eigenmodes (AEs). The threshold is phase-space dependent and occurs when particle orbits become stochastic due to resonances with AEs. Above threshold, equilibrium fast-ion density profiles are unchanged despite increased drive, and intermittent fast-ion losses are observed. Fast-ion D alpha spectroscopy indicates radially localized transport of the copassing population at radii that correspond to the location of midcore AEs. The observation of stiff fast-ion transport suggests that reduced models can be used to effectively predict alpha profiles, beam ion profiles, and losses to aid in the design of optimized scenarios for future burning plasma devices.

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页数：5

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