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 2002 Phys. Plasmas9 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 and mirror-induced Alfvén Eigenmodes), 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.
恒星器中波-粒子相互作用的所谓非轴对称共振（其与磁配置缺乏轴对称性相关，Kolesnichenko等，2002，Phys. Plasmas 9, 517）被发现可能对环向诱导阿尔芬本征模（TAE）和等模（具有相等环向和极向模数且在连续谱中的阿尔芬模）产生强烈的稳定化作用，这些模由高能离子驱动不稳定。这些共振涉及平衡磁场的最大的谐波分量，并导致模能量被中等压力等离子体中的热离子吸收，此时效应显著。另一方面，在例如Helias反应堆的高压力条件下，热离子还可以与高频率阿尔芬间隙模（螺旋性诱导阿尔芬本征模和镜像诱导阿尔芬本征模）相互作用，从而导致这些模的显著阻尼。仅考虑通行粒子的共振。所发展的理论被应用于Wendelstein 7-X恒星器和Helias反应堆中的各种模，以及LHD螺旋装置中的两个TAE模。