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Ohmic H-modes have been obtained in the TCV tokamak in a large range of configurations for different kappa and delta. For certain discharge parameters and wall conditions, long edge localized mode (ELM) free H-modes have been obtained. These ELM free H-modes terminate by a disruption or often by a transition to the L-mode during current ramp-down. Following the L-H transition, a rapid density increase is observed. In TCV this density increase can have either a flat or peaked profile. In such long lasting ELM free H-mode the particle transport can be studied to examine the difference between flat and peaked density profiles. The electron density profiles are measured using a 10 point repetitive Thomson scattering system together with a 6 channel interferometer. The behavior of the density in ELM free H-mode discharges for kappa 1.66 and delta 0.43 is described in this paper.

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Authors: PIETRZYK Z A ET AL, Ecole Polytechnique Fédérale de Lausanne, Centre de Recherches en Physique des Plasmas (CH)
Bibliographic Reference: Article: Proceedings of the 23rd European Physical Society Conference on Controlled Fusion and Plasma Physics, Kiev (UA), June 24-28, 1996, pp. 115-118
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