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The TCV objective is to study the influence of elongation and strong shaping on tokamak performance. ECRH has been chosen as the most suitable heating system, with a pulse length of 2 s. For the EC frequencies, the choice of extraordinary propagation modes in second X2 (83 GHz) and third X3 (118 GHz) harmonics permits heating at the nominal toroidal magnetic field (1.43 T) in a high density plasma. With cut-off densities of 4.3 and 11.5 x 1.0 E19/m3 respectively, combined X2 and X3 heating at fields between 90 % and 100 % of the nominal value is possible at high elongation. A power of 3 MW in X2 and 1.5 MW in X3 is planned. Ray-tracing calculations of the resonance accessibility from the various TCV ports with realistic beam divergence have been performed using the TORAY code, employing (weakly) relativistic descriptions for both dispersion and absorption. Accounting for plasma configurations from circular to fully elongated and imposing various density profiles, these calculations lead to the selection of horizontal to oblique lateral launch for second harmonic heating and current drive, and quasi-vertical top launch for X3 high density heating.

Additional information

Authors: POCHELON A ET AL., Lehigh University, Bethlehem (US)
Bibliographic Reference: Paper presented: 20th EPS Conference on Controlled Fusion and Plasma Physics, Lisboa (PT), July 26-30, 1993
Availability: Available from (1) as Paper EN 37362 ORA
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