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Evolution of geodesic acoustic mode in ohmic H-mode in TUMAN-3M tokamak |
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| Authors: | 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 |
| Affiliation: | 1. Ioffe Physical Technical Institute, Russian Academy of Sciences, St. Petersburg, 194021, Russia 2. Kharkiv Institute of Physics and Technology, National Scientific Center, 61108, Kharkiv, Ukraine 3. 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 (??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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