Heat pulse propagation across the rational surface in a large helical device plasma with counter-neutral beam injection
Heat pulse propagation across the rational surface in a large helical device plasma with counter-neutral beam injection
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DOI：
10.1063/1.2044447
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发表时间：
2005-09-01
影响因子：
2.2
通讯作者：
Komori, A
中科院分区：
文献类型：
--
作者：
Yakovlev, M;Inagaki, S;Komori, A
在大型螺旋装置中观察到了中心电子温度分布的平坦化[A. Iiyoshi Nucl. Fusion 39，1245（1999）]具有反中性束注入的向内移位等离子体。为了研究这一现象，利用同轴电子回旋加热功率调制进行了热脉冲实验。在m/n=2/1有理曲面（m，n分别为极向模数和环向模数）附近观察到热脉冲传播的独特特征。示出了径向分离通量表面上的温度扰动的同时响应。由于磁岛结构的存在，磁场拓扑结构的变化可以解释这种非单调的热脉冲传播。岛的O点位置位于m/n=2/1有理曲面附近。(C)2005年美国物理学会。
Core electron temperature profile flattening is observed in a large helical device [A. Iiyoshi Nucl. Fusion 39, 1245 (1999)] inward shifted plasma with counter-neutral beam injection. To study this phenomenon, heat pulse experiments are performed by on-axis electron cyclotron heating power modulation. A unique feature of heat pulse propagation is observed near the m/n=2/1 rational surface (m, n are the poloidal and toroidal mode numbers, respectively). A simultaneous response of the temperature perturbation on radially separated flux surfaces is shown. The change in the magnetic field topology due to the presence of a magnetic island structure can explain this nonmonotonic heat pulse propagation. The estimated O-point position of the island is located near the m/n=2/1 rational surface. (C) 2005 American Institute of Physics.