Low-frequency global Alfven eigenmodes in low-shear tokamaks with trapped energetic ions

Journal Article · Tue Sep 15 04:00:00 EDT 2009 · Physics of Plasmas

DOI:https://doi.org/10.1063/1.3195072· OSTI ID:21282104

Marchenko, V S; Kolesnichenko, Ya I; Reznik, S N ^[1]

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1. Institute for Nuclear Research, Prospect Nauki 47, Kyiv 03028 (Ukraine)

It is shown that, in the tokamak plasmas with broad low-shear central core and safety factor q{sub 0} > or approx. 1, there exists a low-frequency global Alfven eigenmode capable of resonating with precession of the trapped energetic ions. This mode has the dominant numbers m=n=1, but the coupling with the upper toroidal sideband is crucial both for the eigenmode formation and its excitation by energetic ions. The properties of this mode are consistent with observations of the low-frequency n=1 mode driven by energetic ions in the ''hybrid'' discharges with perpendicular injection on the JT-60U tokamak [N. Oyama, A. Isayama, G. Matsunaga et al., Nucl. Fusion 49, 065026 (2009)].

• OSTI ID: 21282104
• Journal Information: Physics of Plasmas, Journal Name: Physics of Plasmas Journal Issue: 9 Vol. 16; ISSN PHPAEN; ISSN 1070-664X
• Country of Publication: United States
• Language: English

Related Subjects

70 PLASMA PHYSICS AND FUSION TECHNOLOGY
ALFVEN WAVES
ELECTRIC DISCHARGES
JT-60U TOKAMAK
PLASMA
PLASMA INSTABILITY
SHEAR
TAIL IONS
TRAPPING