Conventional and nonconventional global Alfvn eigenmodes in stellarators
Conventional and nonconventional global Alfvn eigenmodes in stellarators
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仿星器中的常规和非常规全局 Alfvn 本征模式
DOI：
10.1063/1.2789558
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发表时间：
2007
影响因子：
2.2
通讯作者：
O. P. Fesenyuk
中科院分区：
文献类型：
--
作者：
Y. Kolesnichenko;V. Lutsenko;A. Weller;A. Werner;Y. Yakovenko;J. Geiger;O. P. Fesenyuk
Ya预言的仿星器的全局Alfven本征模（GAE）和非常规全局Alfven本征模（NGAE）存在的条件。I. Kolesnichenko等人[Phys. Rev. Lett. 94，165004（2005）]。结果发现，它们取决于旋转变换的性质，NGAE的条件可以最容易地满足无电流仿星器。结果表明，等离子体的压缩性可能起着重要的作用，模式的频率约等于或小于环形诱导阿尔芬本征模。发现阿尔芬连续谱在半径k =0（k =纵波数）附近的特征可能非常不同，这取决于我们称之为“声音参数”的参数。模拟仿星器温德尔斯坦7-AS中低频阿尔芬不稳定性的具体计算[A. Weller等人，等离子体8，931（2001）]，这是在合理的协议与观察。它强调…
Conditions of the existence of the Global Alfven Eigenmodes (GAE) and Nonconventional Global Alfven Eigenmodes (NGAE) predicted for stellarators by Ya. I. Kolesnichenko et al. [Phys. Rev. Lett. 94, 165004 (2005)] have been obtained. It is found that they depend on the nature of the rotational transform and that conditions for NGAE can be most easily satisfied in currentless stellarators. It is shown that the plasma compressibility may play an important role for the modes with the frequency about or less than that of the Toroidicity-induced Alfven Eigenmodes. It is found that features of the Alfven continuum in the vicinity of the k‖=0 radius (k‖ is the longitudinal wave number) can be very different, depending on a parameter which we refer to as “the sound parameter.” Specific calculations modeling low-frequency Alfven instabilities in the stellarator Wendelstein 7-AS [A. Weller et al., Phys. Plasmas 8, 931 (2001)] are carried out, which are in reasonable agreement with the observations. It is emphasized ...