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Abstract

Confinement in TCV (Tokamak a Configuration Variable) EC heated discharges is studied as a function of plasma shape, i.e. as a function of elongation 1.1<k<2.15 and triangularity -0.65 <o<0.5. The electron energy confinement time is found to increase with elongation, in part due to the increase of plasma current with elongation. The beneficial effect of negative triangularities is most effective at low power and tends to reduce at the higher powers used.
The variety of sawtooth types observed in TCV for different power deposition locations from on axis to the q=1 region can be simulated with a model including a local power deposition, a growing m/n=1 island (convection and reconnection), plasma rotation and finite heat diffusivity across flux surfaces

Additional information

Authors: CENTRE DE RECHERCHES EN PHYSIQUE DES PLASMAS ECOLE POLYTECHNIQUE FEDERALE, ;LAUSANNE (CH), ;INSTITUTE OF NUCLEAR FUSION, ;MOSCOW (RU), ;DIPARTIMENTO DI ENERGETICA, ;TORINO (IT),
Bibliographic Reference: Article: IAEA Fusion Energy Conference - Proceedings (1998)
Record Number: 199910516 / Last updated on: 1999-03-26
Category: PUBLICATION
Original language: en
Available languages: en