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Following the first boronization of the TCV vacuum vessel, a clear H-mode transition has been observed with Single-Null (SN), Double-Null (DN) and highly elongated limited magnetic configurations using ohmic heating only. A brief description of the general character of the H-mode transition in TCV is given and the paper reports on the behaviour of the density threshold for this transition. Whilst there is some early evidence for a dependence of the transition threshold on magnetic configuration, notably the plasma triangularity, there are strong indications that the threshold density is dominated by local recycling conditions.

Additional information

Authors: DUVAL B P ET AL, Ecole Polytechnique Fédérale de Lausanne, Centre de Recherches enPhysique des Plasmas (CH)
Bibliographic Reference: Article: Proceedings of the 22nd European Physical Society Conference on Controlled Fusion and Plasma Physics, Vol. 19C (1995) Part II, pp. 97-100
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