Low frequency sawtooth precursor activity in ASDEX Upgrade

被引：18
|
作者：
Papp, G. [1 ,2 ,3 ]
Pokol, G. I. [1 ]
Por, G. [1 ]
Magyarkuti, A. [1 ]
Lazanyi, N. [1 ]
Horvath, L. [1 ]
Igochine, V. [4 ]
Maraschek, M. [4 ]
机构：
[1] Budapest Univ Technol & Econ, EURATOM Assoc, Dept Nucl Tech, H-1521 Budapest, Hungary
[2] Chalmers Univ Technol, Dept Appl Phys, SE-41296 Gothenburg, Sweden
[3] Euratom VR Assoc, SE-41296 Gothenburg, Sweden
[4] EURATOM, Max Planck Inst Plasmaphys, D-85748 Garching, Germany
来源：
PLASMA PHYSICS AND CONTROLLED FUSION | 2011年 / 53卷 / 06期
关键词：
NEOCLASSICAL TEARING MODES; MHD MODES; TOKAMAK; RECONNECTION; OSCILLATIONS; PLASMAS; STABILIZATION; STOCHASTICITY; CONFINEMENT; DISRUPTIONS;
D O I：
10.1088/0741-3335/53/6/065007
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：
This paper describes the precursor activity observed in the ASDEX Upgrade tokamak before sawtooth crashes in various neutral beam heated plasmas, utilizing the soft x-ray diagnostic. In addition to the well-known (m, n) = (1,1) internal kink mode and its harmonics, a lower frequency mode is studied in detail. Power modulation of this mode is found to correlate with the power modulation of the (1, 1) kink mode in the quasistationary intervals indicating possible nonlinear interaction. Throughout the studied sawtooth crashes, the power of the lower frequency mode rose by several orders of magnitude just before the crash. In addition to its temporal behaviour, its spatial structure was estimated and the most likely value was found to be (1, 1). A possible role of this mode in the mechanism of the sawtooth crash is discussed.
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页数：17
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