L. G. Askinaze, M. I. Vildjunas, N. A. Zhubr, A. D. Komarov, V. A. Kornev, S. V. Krikunov, L. I. Krupnik, S. V. Lebedev, V. V. Rozhdestvenskii, M. Tendler, A. S. Tukachinsky, S. M. Khrebtov, “Evolution of geodesic acoustic mode in ohmic H-mode in TUMAN-3M tokamak”, Pisma v Zhurnal Tekhnicheskoi Fiziki, 2012, Volume 38, Issue 6,Pages <nobr>29

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Evolution of geodesic acoustic mode in ohmic H-mode in TUMAN-3M tokamak

L. G. Askinaze^a, M. I. Vildjunas^a, N. A. Zhubr^a, A. D. Komarov^a, V. A. Kornev^a, S. V. Krikunov^a, L. I. Krupnik^b, S. V. Lebedev^a, V. V. Rozhdestvenskii^a, M. Tendler^c, A. S. Tukachinsky^a, S. M. Khrebtov^b

^a Ioffe Institute, St. Petersburg
^b National Science Centre Kharkov Institute of Physics and Technology
^c Royal Institute of Technology, 10044, Stockholm, Sweden

Abstract: The behavior of a geodesic acoustic mode (GAM) in the TUMAN-3M tokamak has been experimentally studied using the heavy-ion beam probing technique. Oscillations of the electric potential under the action of a GAM localized at the plasma periphery have been detected. The GAM was observed in the regime of low confinement (L-mode) with low plasma density ($\sim$ 0.8 $\times$ 10$^{19}$ m$^{-3}$) and disappeared upon the transition to a high confinement regime (H-mode). The possible role of GAM as a precursor of the improved confinement (LH-transition) is discussed.

Received: 16.11.2011