Interaction of neoclassical tearing modes with trapped fast ions
Interaction of neoclassical tearing modes with trapped fast ions
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DOI：
10.1063/1.1407283
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发表时间：
2001-10
影响因子：
2.2
通讯作者：
V. Marchenko;V. Lutsenko
中科院分区：
文献类型：
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作者：
V. Marchenko;V. Lutsenko
考虑了旋转新古典撕裂模式（NTM）和进动捕获的高能离子之间的共振。共振离子的香蕉导向中心经历较大的径向偏移，导致沉积在共振区域的相当一部分快离子的损失。由此产生的环形扭矩加速磁岛沿离子反磁漂移方向旋转。扭矩平衡方程与修正的卢瑟福方程耦合，保留了自举电流和离子极化电流的贡献。已经表明，由于与高能离子的共振相互作用，该自治方程组在动量阻尼率与电阻扩散率的某些临界比率下表现出霍普夫分岔。由此产生的稳定极限环类似于轴对称偏滤器实验升级（ASDEX 升级）托卡马克 [S. Sesnic 等人，物理学。等离子 7、93...
Resonance between rotating neoclassical tearing mode (NTM) and precessing trapped energetic ions has been considered. Resonant ions experience large radial excursions of their banana guiding centers leading to the loss of a considerable fraction of fast ions deposited in the resonance region. The resulting toroidal torque accelerates the magnetic island rotating in the direction of the ion diamagnetic drift. The torque balance equation has been coupled with the modified Rutherford equation, retaining the contributions from the bootstrap current and the ion polarization current. It has been shown that, due to the resonant interaction with energetic ions, this autonomous system of equations exhibits a Hopf bifurcation for some critical ratio of the momentum damping rate to the resistive diffusion rate. The resulting stable limit cycle resembles the frequency jump events observed during NTM activity in the Axisymmetric Divertor Experiment Upgrade (ASDEX Upgrade) tokamak [S. Sesnic et al., Phys. Plasmas 7, 93...