Author/Authors :
Lyssoivan، نويسنده , , A. and Hartmann، نويسنده , , D.A. and Noterdaeme، نويسنده , , J.-M. and Koch، نويسنده , , R. and Bobkov، نويسنده , , V. and Blackman، نويسنده , , T. and Braun، نويسنده , , F. and Cox، نويسنده , , M. and de Vries، نويسنده , , P. and Esser، نويسنده , , H.G. and Fahrbach، نويسنده , , H.-U. and Gafert، نويسنده , , J. and Gauthier، نويسنده , , E. and Gehre، نويسنده , , O. and Graham، نويسنده , , M. and Haas، نويسنده , , G. an، نويسنده ,
Abstract :
Encouraging results of efficient wall conditioning with ICRF discharges achieved on the circular tokamaks (without divertors) TEXTOR, TORE SUPRA, HT-7 stimulated the next step in the development of an alternative wall conditioning technique that is relevant to reactor-scale superconducting fusion machines. Here, the first results on the ICRF discharge initiation and the wall conditioning on the large-size non-circular tokamaks ASDEX Upgrade and JET using the standard ICRF antennas are reported. Analysis of the mass-spectrum data on both machines indicates noticeable outgassing of deuterium, water and hydrocarbons from the walls despite operating with a non-optimized set of ICRF discharge parameters.
Keywords :
Wall conditioning , ICRF antenna , ITER , RF discharge
