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(EX8/3) Energy Confinement and MHD Activity in Shaped TCV Plasmas with Localised Electron Cyclotron Heating

   
A. Pochelon , S. Alberti , C. Angioni , S. Barry , R. Behn , P. Blanchard , P. Bosshard , R. Chavan , S. Coda , B. P. Duval , D. Fasel , A. Favre , S. Franke , I. Furno , T. P. Goodman , P. Gorgerat , M. Henderson , F. Hofmann , J-P. Hogge , P-F. Isoz , B. Joye , J. B. Lister , X. Llobet , J-C. Magnin , P. Mandrin , A. Manini , B. Marletaz , Ph. Marmillod , Y. Martin , J-M. Mayor , J-M. Moret , Ch. Nieswand , P. J. Paris , A. Perez , Z. A. Pietrzyk , R. A. Pitts , A. Refke , H. Reimerdes , J. Rommers , O. Sauter , W. van Toledo , G. Tonetti , M. Q. Tran , F. Troyon , P. Vyas , H. Weisen 
Centre de Recherches en Physique des Plasmas, Association EURATOM - Confédération Suisse, Ecole Polytechnique Fédérale de Lausanne, CH-1015 Lausanne, Switzerland
 
Yu. V. Esipchuck , N. Kirneva , A. A. Martynov , K. A. Razumova , A. Sushkov 
Institute of Nuclear Fusion, Russian Research Centre, Kurchatov Institute, 123 182 Moscow, Russia
 
F. Porcelli , E. Rossi 
Dipartimento Di Energetica Politecnico di Torino I-10129 Torino, Italy

Abstract
Confinement in TCV  (Tokamak à Configuration Variable) EC heated discharges is studied as a function of plasma shape, i.e. as a function of elongation $1.1 < kappa < 2.15$ and triangularity $-0.65 \leq \delta \leq 0.5$. 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 large 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.

   

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