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 (∼0.8 × 1019 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.
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References
N. Winsor, J. Johnson, and J. Dawson, Phys. Fluids 11, 2448 (1968).
A. Fujisawa, T. Ido, A. Shimizu, et al., Nucl. Fusion 47, S718 (2007).
P. H. Diamond, S.-I. Itoh, K. Itoh, et al., Plasma Phys. Control. Fusion 47, R35 (2005).
G. D. Conway, C. Angioni, F. Ryter, et al., Phys. Rev. Lett. 106, 065001 (2011).
G. M. Vorobiev et al., Sov. J. Plasma Phys. (Fiz. Plazmy) 9, 65 (1983).
L. G. Askinazi, V. A. Kornev, S. V. Krikunov, et al., Proceedings of the 34th EPS Conf. on Plasma Physics (July 2–6, 2007, Warsaw, 2007), ECA 31, 5092 (2007).
L. G. Askinazi, V. A. Kornev, S. V. Lebedev, et al., Rev. Sci. Instrum. 75, 3517 (2004).
L. G. Askinazi, V. E. Golant, V. A. Kornev, et al., Plasma Phys. Control. Fusion 48, A85 (2006).
E. Kaveeva, V. Rozhansky, and M. Tendler, Nucl. Fusion 48, 075003 (2008).
T. Ido et al., Plasma Phys. Control. Fusion 48, 41 (2006).
S. V. Lebedev, L. G. Askinazi, F. V. Chernyshev, et al., Nucl. Fusion 49, 085029 (2009).
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Original Russian Text © L.G. Askinazi, M.I. Vildjunas, N.A. Zhubr, A.D. Komarov, V.A. Kornev, S.V. Krikunov, L.I. Krupnik, S.V. Lebedev, V.V. Rozhdestvensky, M. Tendler, A.S. Tukachinsky, S.M. Khrebtov, 2012, published in Pis’ma v Zhurnal Tekhnicheskoi Fiziki, 2012, Vol. 38, No. 6, pp. 29–36.
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Askinazi, L.G., Vildjunas, M.I., Zhubr, N.A. et al. Evolution of geodesic acoustic mode in ohmic H-mode in TUMAN-3M tokamak. Tech. Phys. Lett. 38, 268–271 (2012). https://doi.org/10.1134/S1063785012030194
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DOI: https://doi.org/10.1134/S1063785012030194