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Title: Non-conventional Fishbone Instabilities

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.
Authors:
; ; ;
Publication Date:
OSTI Identifier:
836155
Report Number(s):
PPPL-4022
TRN: US0500508
DOE Contract Number:
AC02-76CH03073
Resource Type:
Technical Report
Resource Relation:
Other Information: PBD: 10 Nov 2004
Research Org:
Princeton Plasma Physics Lab., Princeton, NJ (US)
Sponsoring Org:
USDOE Office of Science (SC) (US)
Country of Publication:
United States
Language:
English
Subject:
70 PLASMA PHYSICS AND FUSION TECHNOLOGY; 74 ATOMIC AND MOLECULAR PHYSICS; FISHBONE INSTABILITY; INSTABILITY; MAGNETIC FIELDS; PRECESSION; SHEAR; TAIL IONS FISHBONE INSTABILITY; KINK INSTABILITY; TOKAMAKS