Wall effects in improved confinement modes in the FT-2 tokamak
V.N. BudnikovA. F. Ioffe Physicotechnical Institute, Russian Academy of Sciences, St. PetersburgV. V. DyachenkoA. F. Ioffe Physicotechnical Institute, Russian Academy of Sciences, St. Petersburg,L. A. EsipovA. F. Ioffe Physicotechnical Institute, Russian Academy of Sciences, St. PetersburgE. R. ItsA. F. Ioffe Physicotechnical Institute, Russian Academy of Sciences, St. PetersburgS. I. LashkulA. F. Ioffe Physicotechnical Institute, Russian Academy of Sciences, St. PetersburgA. D. LebedevA. F. Ioffe Physicotechnical Institute, Russian Academy of Sciences, St. PetersburgА. Yu. StepanovA. F. Ioffe Physicotechnical Institute, Russian Academy of Sciences, St. PetersburgI. E. SakharovA. F. Ioffe Physicotechnical Institute, Russian Academy of Sciences, St. PetersburgV. Yu. ShorikovA. F. Ioffe Physicotechnical Institute, Russian Academy of Sciences, St. PetersburgS. V. ShatalinA. F. Ioffe Physicotechnical Institute, Russian Academy of Sciences, St. PetersburgE. O. ChechikA. F. Ioffe Physicotechnical Institute, Russian Academy of Sciences, St. PetersburgO. N. ShcherbininA. F. Ioffe Physicotechnical Institute, Russian Academy of Sciences, St. Petersburg
ABI
Abstract
An analysis is made of the transition to improved confinement (H-mode) observed in lower hybrid heating experiments in the FT-2 tokamak. Particular attention is paid to processes taking place near the wall, including the suppression of microfluctuations accompanying the L-H transition and the buildup of edge-localized modes (ELM activity). The conditions for transition to the H-mode are discussed only for Ohmic heating. The data are compared with the results of large tokamak experiments.
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