Non-conventional Fishbone Instabilities

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

Princeton University. Plasma Physics Laboratory.

关键词: Precession;    Fishbone Instability;    Magnetic Fields;    70 Plasma Physics And Fusion Technology;    Tail Ions Fishbone Instability;   

DOI  :  10.2172/836155
RP-ID  :  PPPL-4022
RP-ID  :  AC02-76CH03073
RP-ID  :  836155

美国|英语

来源: UNT Digital 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.