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Tokamaks experiment exhibit a dependence of the L-H power threshold on the ion drift direction. This experimental result could be explained by resistance interchange microinstabilities in the scrap-off-layer (SOL). In this paper it is shown that the sheath resistance near the target plates depends on the direction on the direction of the longitudinal SOL current. In conjunction with the curvature of the toroidal magnetic field and the ion drift direction these effects lead to an asymmetry in the turbulence near the plasma edge requiring a different L-H power threshold for reducing this turbulence.

Additional information

Authors: CORDEY J G, JET Joint Undertaking, Abingdon, Oxon. (GB);KERNER W, JET Joint Undertaking, Abingdon, Oxon. (GB);POGUTSE O, JET Joint Undertaking, Abingdon, Oxon. (GB);NASSIGH A, JET Joint Undertaking, Abingdon, Oxon. (GB)
Bibliographic Reference: Article: JET-P(96)09 EN (1996) 12pp.
Availability: Available from the Publications Officer, JET Joint Undertaking, Abingdon, Oxon, OX14 3EA (GB)
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