Stochastic orbit loss of neutral beam ions from NSTX due to toroidal Alfven eigenmode avalanches

被引：11

作者：

Darrow, D. S. ^{[1
]}

Crocker, N. ^{[2
]}

Fredrickson, E. D. ^{[1
]}

Gorelenkov, N. N. ^{[1
]}

Gorelenkova, M. ^{[1
]}

Kubota, S. ^{[2
]}

Medley, S. S. ^{[1
]}

Podesta, M. ^{[1
]}

Shi, L. ^{[1
]}

White, R. B. ^{[1
]}

机构：

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

[2] Univ Calif Los Angeles, Dept Phys, Los Angeles, CA 90024 USA

来源：

NUCLEAR FUSION | 2013年 / 53卷 / 01期

关键词：

D O I：

10.1088/0029-5515/53/1/013009

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：

Short toroidal Alfven eigenmode (TAE) avalanche bursts in the National Spherical Torus Experiment (NSTX) cause a drop in the neutron rate and sometimes a loss of neutral beam ions at or near the full injection energy over an extended range of pitch angles. The simultaneous loss of wide ranges of pitch angle suggests stochastic transport of the beam ions occurs. When beam ion orbits are followed with a guiding centre code that incorporates the plasma's magnetic equilibrium plus the measured modes, the predicted ranges of lost pitch angle are similar to those seen in the experiment, with distinct populations of trapped and passing orbits lost. These correspond to domains where the stochasticity extends in the orbit phase space from the region of beam ion deposition to the loss boundary and the trajectories along which modes may transport particles extend from the deposition volume to the loss boundary.

引用

页数：8