Non-Conventional Fishbone Instabilities.

Kolesnichenko, Y. I. ; Lutsenko, V. V. ; Marchenko, V. S. ; White, R. B.

Technical Information Center Oak Ridge Tennessee

关键词: Fishbone instability;    Magnetic fields;    Precession;    Instability;    Shear;   

RP-ID  :  DE2005836155

学科分类：工程和技术（综合）

美国|英语

来源: National Technical Reports Library

【 摘 要 】

New instabilities of fishbone type are predicted. First, a trapped-particle-induced m = n = 1 instability with the mode structure having nothing to do with the conventional rigid kink displacement. This instability takes place when the magnetic field is weak, so that the precession frequency of the energetic ions is not small as compared to the frequency of the corresponding Alfven continuum at r = 0 and the magnetic shear is small inside the q = 1 radius (the case relevant to spherical tori). Second, an Energetic Particle Mode fishbone instability driven by circulating particles. Third, a double-kink-mode instability driven by the circulating energetic ions. In particular, the latter can have two frequencies simultaneously: we refer to it as ''doublet'' fishbones. This instability can occur when the radial profile of the energetic ions has an off-axis maximum inside the region of the mode localization.