Experimental study of toroidal Alfven modes in the Globus-M spherical tokamak

Journal Article · Thu Dec 15 00:00:00 EST 2011 · Plasma Physics Reports

DOI:https://doi.org/10.1134/S1063780X11110067· OSTI ID:22047479

Petrov, Yu V; Patrov, M I; Gusev, V K; Ivanov, A E; Minaev, V B; Sakharov, N V; Tolstyakov, S Yu; Kurskiev, G S ^[1]

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1. Russian Academy of Sciences, Ioffe Physical Technical Institute (Russian Federation)

In the experiments carried out on the Globus-M tokamak in regimes with injection of 26-keV neutral beams with a power of 0.75-0.85 MW, two branches of instabilities excited by fast ions were observed in the early stage of a discharge: a low-frequency energetic particle mode (EPM) in the frequency range of 5-30 kHz and a high-frequency mode in the range of 50-200 kHz, identified as a toroidal Alfven eigenmode (TAE). The TAE developed in the initial phase of the discharge at q(0) > 1 and terminated when sawtooth oscillations were excited at q(0) < 1. The spectrum and spatial localization of the mode agree with predictions of the linear theory. The modes observed in the Globus-M tokamak possess both properties common to other tokamaks and their own specific features.

• OSTI ID: 22047479
• Journal Information: Plasma Physics Reports, Vol. 37, Issue 12; Other Information: Copyright (c) 2011 Pleiades Publishing, Ltd.; Country of input: International Atomic Energy Agency (IAEA); ISSN 1063-780X
• Country of Publication: United States
• Language: English

Related Subjects

70 PLASMA PHYSICS AND FUSION TECHNOLOGY
ALFVEN WAVES
BEAM INJECTION HEATING
GLOBUS-M SPHEROMAK
KEV RANGE
KHZ RANGE
NEUTRAL ATOM BEAM INJECTION
PLASMA INSTABILITY
SAWTOOTH OSCILLATIONS