Structure of the plasma and energy balance near the limiter in the L-2 stellarator

• Published in: Journal of nuclear materials Vol. 162; pp. 831 - 838
• Main Authors: Berezhetskii, M.S., Budaev, V.P., Ivanov, R.S., Rakowez, A.A., Popov, S.N., Kholnov, Yu.V., Andryukhina, E.D., Dyabilin, K.S., Fedyanin, O.I.
• Format: Journal Article
• Language: English
• Published: Elsevier B.V 01.04.1989
• Subjects: edge plasma; energy balance; L-2 stellarator; turbulence; energy balance; turbulence; L-2 stellarator; edge plasma
• ISSN: 0022-3115; 1873-4820
• DOI: 10.1016/0022-3115(89)90371-1

The results of a study of the properties of the edge plasma in the L-2 stellator are reported. The edge plasma can be divided into three radial regions: a low density region between the wall and the separatrix ( n e ≤ 1 × 10 9 cm −3), a high gradient region near the separatrix and a region inside the separatrix zone with density ~ n e ≤ 1 × 10 12 cm −3. Edge turbulence is found to be sensitive to the mode of plasma heating. Edge plasma data from the stellarator is compared with that from the TV-1 tokamak. An energy balance in the near limiter zone of the stellarator is analysed from experimental measurements of the radial heat flux profiles and also from numerical simulations based on a theoretical model. It is shown that the experimentally measured limiter efficiency is well described theoretically.