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Ohmic H-mode has been achieved over a wide range of plasma conditions in the tokamak à configuration variable (TCV). Some parameters such as plasma current, density, elongation and gaps as well as a reduction of the particle recycling by wall conditioning are known to play an important role in the H-mode accessibility. The difficulty of extracting physical parameters which indicate the imminence of a LH transition forced the use of a statistical approach, the discriminant analysis. This method consists of a coordinate transformation which maximizes the intercorrelation between data groups while increasing the intracorrelation within a data group. Applied to a large TCV H-mode database, it allowed the extraction of a transition probability which approaches 1 near the LH transitions. The weight of each input parameter used in the determination of this probability is discussed.

Additional information

Authors: MARTIN Y, École Polytechnique Fédérale de Lausanne, Centre de Recherches en Physique des Plasmas (CH)
Bibliographic Reference: Article: Bulletin of the American Physical Society, Vol. 42 (1997) No. 10, p.1857
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