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VOLUME 59 (1994) | ISSUE 2 | PAGE 94
Energy-confinement features observed in experiments with the ohmic H mode in the TUMAN-3 tokamak
Some new features of energy confinement have been observed in the regime with reduced plasma transport during ohmic heating: the ohmic Η mode. In particular, the energy confinement time τΕ depends strongly on the plasma current and the injected power, while it depends only weakly on the density. Both the absolute values of the energy confinement time and its dependence on the parameters correspond well to the empirical law (the scaling law) which describes the Η regime in devices with intense auxiliary heating. The results found here indicate that the physics of the confinement in the Η mode is the same in devices differing in geometry and in heating method. An unexpectedly long energy confinement time—30 ms—has been measured in the small TUMAN-3 device. This figure exceeds the prediction of the scaling law for an ohmically heated plasma by a factor of 15.