Non-conventional Fishbone Instabilities

Technical Report · Wed Nov 10 04:00:00 EST 2004

DOI:https://doi.org/10.2172/836155· OSTI ID:836155

Kolesnichenko, Ya I ^[1]; Lutsenko, V V; Marchenko, V S; White, R B

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1. Princeton Plasma Physics Laboratory

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.

• Research Organization: Princeton Plasma Physics Lab., Princeton, NJ (US)
• Sponsoring Organization: USDOE Office of Science (SC) (US)
• DOE Contract Number: AC02-76CH03073
• OSTI ID: 836155
• Report Number(s): PPPL-4022
• Country of Publication: United States
• Language: English

Related Subjects

70 PLASMA PHYSICS AND FUSION TECHNOLOGY
74 ATOMIC AND MOLECULAR PHYSICS
FISHBONE INSTABILITY
INSTABILITY
KINK INSTABILITY
MAGNETIC FIELDS
PRECESSION
SHEAR
TAIL IONS
TOKAMAKS