The Present State of Investigations on Stellarators in Kharkov

概要

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At present, two stellarator type fusion devices, Uragan-2 M and Uragan-3 M, are in operation in Kharkov. At the Uragan-3 M machine, investigations of the low-density low-collisional plasma are continued. L-H-mode-like transition is studied with particular attention to the mechanisms of its formation and impact on divertor flow behaviour. For a higher density plasma, a scenario of the RF Alfvén resonance heating in high k|| regime is realized both with continuous and pulsed gas injection. On Uragan-2 M the studies of RF wall conditioning are in progress. A new wall conditioning scheme which uses the high frequency slow wave is implemented.