Fast-ion transport and neutral beam current drive in ASDEX upgrade

被引：45
作者：
Geiger, B. [1 ]
Weiland, M. [1 ]
Jacobsen, A. S. [2 ]
Rittich, D. [1 ]
Dux, R. [1 ]
Fischer, R. [1 ]
Hopf, C. [1 ]
Maraschek, M. [1 ]
McDermott, R. M. [1 ]
Nielsen, S. K. [2 ]
Odstrcil, T. [1 ]
Reich, M. [1 ]
Ryter, F. [1 ]
Salewski, M. [2 ]
Schneider, P. A. [1 ]
Tardini, G. [1 ]
机构：
[1] Max Planck Inst Plasma Phys, D-85748 Garching, Germany
[2] Tech Univ Denmark, Dept Phys, DK-2800 Lyngby, Denmark
来源：
NUCLEAR FUSION | 2015年 / 55卷 / 08期
关键词：
current drive; FIDA; fast ion; sawtooth crash; off-axis NBI; EQUILIBRIA; PLASMA; MODES;
D O I：
10.1088/0029-5515/55/8/083001
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：
The neutral beam current drive efficiency has been investigated in the ASDEX Upgrade tokamak by replacing on-axis neutral beams with tangential off-axis beams. A clear modification of the radial fast-ion profiles is observed with a fast-ion D-alpha diagnostic that measures centrally peaked profiles during on-axis injection and outwards shifted profiles during off-axis injection. Due to this change of the fast-ion population, a clear modification of the plasma current profile is predicted but not observed by a motional Stark effect diagnostic. The fast-ion transport caused by MHD activity has been studied in low collisionality discharges that exhibit strong (1, 1) modes. In particular due to sawtooth crashes, significant radial redistribution of co-rotating fast-ions is observed which can very well be described by the Kadomtsev model. In addition, first tomographic reconstructions of the central 2D fastion velocity space in the presence of sawtooth crashes allow the investigation of the pitch dependence of the mode-imposed redistribution: a stronger redistribution of mainly co-rotating fast ions is observed than of those with smaller pitch values.
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