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(OV5/1) Overview of TCV Results

H. Weisen¹⁾, S. Alberti¹⁾, C. Angioni¹⁾, K. Appert¹⁾, J. Bakos²⁾, R. Behn¹⁾, P. Blanchard¹⁾, P. Bosshard¹⁾, R. Chavan¹⁾, S. Coda¹⁾, I. Condrea¹⁾, A. Degeling¹⁾, B. P. Duval¹⁾, D. Fasel¹⁾, J.-Y. Favez¹⁾, A. Favre¹⁾, I. Furno¹⁾, P. Gomez¹⁾, T. Goodman¹⁾, M. A. Henderson¹⁾, F. Hofmann¹⁾, R. R. Kayruthdinov³⁾, P. Lavanchy¹⁾, J. B. Lister¹⁾, X. Llobet¹⁾, A. Loarte⁴⁾, V. Lukash⁵⁾, P. Gorgerat¹⁾, J.-P. Hogge¹⁾, P.-F. Isoz¹⁾, B. Joye¹⁾, J.-C. Magnin¹⁾, A. Manini¹⁾, B. Marlétaz¹⁾, P. Marmillod¹⁾, Y. R. Martin¹⁾, A. Martynov¹⁾, J.-M. Mayor¹⁾, E. Minardi⁶⁾, J. Mlynar¹⁾, J.-M. Moret¹⁾, P. Nikkola¹⁾, P. J. Paris¹⁾, A. Perez¹⁾, Y. Peysson⁷⁾, Z. A. Pietrzyk¹⁾, V. Piffl⁸⁾, R. A. Pitts¹⁾, A. Pochelon¹⁾, H. Reimerdes¹⁾, J. H. Rommers¹⁾, O. Sauter¹⁾, E. Scavino¹⁾, A. Sushkov⁴⁾, G. Tonetti¹⁾, M. Q. Tran¹⁾ and A. Zabolotsky^1)
 
1) Centre de Recherches en Physique des Plasmas, École Polytechnique Fédérale de Lausanne,
Association EURATOM-Suisse, 1015 Lausanne, Switzerland
²⁾ KFKI, Budapest, Hungary
³⁾ EFDA-CSU, Garching, Germany
⁴⁾ RRC, Moscow, Russia
⁵⁾ TRINITI, Troisk, Russia,
⁶⁾ Istituto di Fisica del Plasma ``P.Caldirola'', Milano, Italy
⁷⁾ CEA, Cadarache, France
⁸⁾ IPP, Prague, Czech Republic

Abstract.  The TCV tokamak ( R = 0.88m, a < 0.25m, B_T < 1.54T) is equipped with six 0.5MW gyrotron sources operating at 82.7 GHz for second harmonic X-mode ECH. By distributing the ECCD current sources over the discharge cross section, fully driven stationary plasmas with I_p = 210kA, n_e0 = 2×10¹⁹m^{- 3}, T_e0 $\approx$ 4keV, were obtained for the full discharge duration of 2s. Highly peaked electron temperature profiles with T_e0 up to 12keV were obtained in central counter current drive scenarios with off-axis ECH. Absorption measurements using a 118 GHz gyrotron have demonstrated the importance of suprathermal electrons for third harmonic absorption. A coupled heat-particle transport phenomenon known as ``density pumpout'', which leads to the expulsion of particles from the plasma core, has been linked to the presence of m=1 modes, suggesting that it is due to the existence of locally trapped particles associated with the loss of axisymmetry. Highly elongated discharges have been developed with Ohmic heating ( $\kappa$ < 2.8) and off-axis ECH. The latter exhibit considerably improved vertical stability due to current profile broadening. A ``gateway'' for Elmy H-modes has been discovered, which allows stationary Ohmic ELMy H-mode operation in over wide range of elongation, triangularity and density. Divertor detachment experiments suggest the existence of recombination pathways other than three-body or radiative processes.

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