Resistive interchange mode destabilized by helically trapped energetic ions and its effects on energetic ions and bulk plasma in a helical plasma
Resistive interchange mode destabilized by helically trapped energetic ions and its effects on energetic ions and bulk plasma in a helical plasma
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螺旋捕获的高能离子破坏电阻交换模式及其对螺旋等离子体中的高能离子和体等离子体的影响
DOI：
10.1088/0029-5515/56/1/016002
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发表时间：
2015
期刊：
影响因子：
3.3
通讯作者：
H. Tsuchiya
中科院分区：
文献类型：
--
作者：
X. Du;K. Toi;S. Ohdachi;M. Osakabe;T. Ido;K. Tanaka;M. Yokoyama;M. Yoshinuma;K. Ogawa;K. Watanabe;T. Akiyama;M. Isobe;K. Nagaoka;T. Ozaki;S. Sakakibara;R. Seki;A. Shimizu;Y. Suzuki;H. Tsuchiya
提出了m=1/n=1？>结构（m？>，n？>：在无净电流、低β LHD（Large Helical Device）等离子体的边缘区域，首次观察到了垂直中性束高功率注入时，在小于10 kHz的范围内具有突发特性和快速频率啁啾的等离子体（分别为极向和环向模数）。该模式与螺旋捕获的高能离子（EP）的进动运动共振，遵循共振条件。径向模式结构被认为与压力驱动的电阻交换模式类似，其径向位移本征函数非常局限于模式有理表面周围，并在频率啁啾阶段后期演变为奇型（或岛型）。当螺旋捕获的EP的β值超过某个阈值时，该光束驱动模式被激发。这种不稳定性被认为是被俘获的高能离子所破坏的电阻交换模的一个新的分支。由该模式引起的螺旋捕获的高能离子的径向传输，即重新分布和损失，瞬时地在等离子体外围区域附近产生显著的径向电场。由此产生的径向电场的大剪切被认为有助于所观察到的微湍流的抑制和完全电离的碳杂质离子的温度和电子密度的瞬态增加，这表明体等离子体约束的改善。
A resistive interchange mode of the m=1/n=1 ?> structure (m ?>, n ?>: poloidal and toroidal mode numbers, respectively) with a bursting character and rapid frequency chirping in the range less than 10 kHz is observed for the first time in the edge region of the net current-free, low beta LHD (Large Helical Device) plasmas during high power injection of perpendicular neutral beams. The mode resonates with the precession motion of helically trapped energetic ions (EPs), following the resonant condition. The radial mode structure is recognized to be similar to that of the pressure-driven resistive interchange mode, of which radial displacement eigenfunction quite localizes around the mode rational surface, and evolves into an odd-type (or island-type) during the late of frequency chirping phase. This beam driven mode is excited when the beta value of helically trapped EPs exceeds a certain threshold. This instability is thought to be a new branch of resistive interchange mode destabilized by the trapped energetic ions. The radial transport, i.e. redistribution and losses, of helically trapped energetic ions induced by the mode transiently generates significant radial electric field near the plasma peripheral region. The large shear of thus generated radial electric field is thought to contribute to the observed suppression of micro-turbulence and transient increases of the temperature of fully ionized carbon impurity ions and electron density, suggesting improvement of bulk plasma confinement.
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影响因子：
3.3
作者：
M. Osakabe;S. Yamamoto;K. Toi;Y. Takeiri;S. Sakakibara;K. Nagaoka;K. Tanaka;K. Narihara
通讯作者：
M. Osakabe;S. Yamamoto;K. Toi;Y. Takeiri;S. Sakakibara;K. Nagaoka;K. Tanaka;K. Narihara
LHD实验组，“大型螺旋装置中与反应堆相关的高β状态的MHD研究”
DOI：
--
发表时间：
2008
期刊：
Plasma Physics and Controlled Fusion 50
影响因子：
--
作者：
S. Sakakibara;K. Y. Watanabe;Y. Suzuki;Y. Narushima;S. Ohdachi;N. Nakajima;F. Watanabe;L. Garcia;A. Weller;K. Toi;I. Yamada;K. Tanaka;T. Tokuzawa;K. Ida;H. Yamada;A. Komori;O. Motojima
通讯作者：
O. Motojima
影响因子：
8.6
作者：
Matsunaga, G.;Aiba, N.;Ozeki, T.
通讯作者：
Ozeki, T.
影响因子：
2.2
作者：
M. Okabayashi;G. Matsunaga;J. Degrassie;W. Heidbrink;Y. In;Yueqiang Liu;H. Reimerdes;W. Solomon
通讯作者：
M. Okabayashi;G. Matsunaga;J. Degrassie;W. Heidbrink;Y. In;Yueqiang Liu;H. Reimerdes;W. Solomon
MHD均衡的特点及LHD相关问题
DOI：
--
发表时间：
2010
期刊：
Fusion Science & Technology 50巻,7号
影响因子：
--
作者：
K.Y.Watanabe;Y.Suzuki;S.Sakakibara;et al.
通讯作者：
et al.