Velocity-space studies of fast-ion transport at a sawtooth crash in neutral-beam heated plasmas

被引：43
|
作者：
Muscatello, C. M. [1 ]
Heidbrink, W. W. [1 ]
Kolesnichenko, Ya I. [2 ]
Lutsenko, V. V. [2 ]
Van Zeeland, M. A. [3 ]
Yakovenko, Yu V. [2 ]
机构：
[1] Univ Calif Irvine, Dept Phys & Astron, Irvine, CA 92717 USA
[2] Ukrainian Acad Sci, Inst Nucl Res, UA-252028 Kiev, Ukraine
[3] Gen Atom Co, San Diego, CA 92186 USA
来源：
PLASMA PHYSICS AND CONTROLLED FUSION | 2012年 / 54卷 / 02期
关键词：
DIII-D TOKAMAK; EMISSION; ALPHA; TFTR; REDISTRIBUTION; SPECTROSCOPY; OSCILLATIONS; DISCHARGES; CODE;
D O I：
10.1088/0741-3335/54/2/025006
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：
In tokamaks the crash phase of the sawtooth instability causes fast-ion transport. The DIII-D tokamak is equipped with a suite of core fast-ion diagnostics that can probe different parts of phase space. Over a variety of operating conditions, energetic passing ions are observed to undergo larger redistribution than their trapped counterparts. Passing ions of all energies are redistributed, but only low-energy (less than or similar to 40 keV) trapped ions suffer redistribution. The transport process is modeled using a numerical approach to the drift-kinetic equation. The simulation reproduces the characteristic that circulating energetic ions experience the greatest levels of internal transport. An analytic treatment of particle drifts suggests that the difference in observed transport depends on the magnitude of toroidal drift.
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页数：13
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