仿星器中Alfvénic模的朗道阻尼
Landau damping of Alfvénic modes in stellarators
摘要：
研究发现，仿星器中存在所谓的波粒相互作用的非轴对称共振[这与磁位形缺乏轴对称性有关，Kolesnichenko等人，等离子体9（2002）517]可以通过朗道机制对由高能离子不稳定化的环形诱导的阿尔文本征模（TAE）和等门模（在连续区中具有相等的极向和环形模数目和频率的阿尔文模）具有强的稳定化影响。这些共振涉及仿星器的平衡磁场的最大谐波，并导致中压等离子体中的热离子吸收模式能量，在这种情况下，效果很大。另一方面，在归因于例如，在Helias反应堆中，热离子也可以与高频Alfvén间隙模式[螺旋诱导Alfvén本征模式（HAE）和镜面诱导Alfvén本征模式（MAE）]相互作用，导致这些模式的相当大的阻尼。只考虑与通过粒子的共振。所开发的理论适用于各种模式的文德尔斯坦7-X仿星器和一个Helias反应堆，并在LHD螺旋装置的两个TAE模式。
英文摘要：
It is found that the presence of the so-called non-axisymmetric resonances of wave-particle interaction in stellarators [which are associated with the lack of axial symmetry of the magnetic configuration, Kolesnichenko et al., Phys. Plasmas 9 (2002) 517] may have a strong stabilizing influence through Landau mechanism on the Toroidicity-induced Alfvén Eigenmodes (TAE) and isomon modes (Alfvénic modes with equal poloidal and toroidal mode numbers and frequencies in the continuum region) destabilized by the energetic ions. These resonances involve largest harmonics of the equilibrium magnetic field of stellarators and lead to absorption of the mode energy by thermal ions in medium pressure plasma, in which case the effect is large. On the other hand, at the high pressure attributed to, e.g., a Helias reactor, thermal ions can interact also with high frequency Alfvén gap modes [Helicity-induced Alfvén Eigenmodes (HAE) and mirror-induced Alfvén Eigenmodes (MAE)], leading to a considerable damping of these modes. Only resonances with passing particles are considered. The developed theory is applied to various modes in the Wendelstein 7-X stellarator and a Helias reactor, and to two TAE modes in the LHD helical device.
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