Author/Authors :
Argouarch، نويسنده , , A. and Vulliez، نويسنده , , K. and Mollard، نويسنده , , P. and Lombard، نويسنده , , G. and Bosia، نويسنده , , G. and COLAS، نويسنده , , L. and Mendes، نويسنده , , A. and Volpe، نويسنده , , D. and Millon، نويسنده , , L. and Ekedahl، نويسنده , , A. and Brémond، نويسنده , , S. and Clairet، نويسنده , , F. and Hoang، نويسنده , , G.T. and Mendes، نويسنده , , A. and Elkhaldi، نويسنده , , M. and Beaumont، نويسنده , , B. and Becoulet، نويسنده , , A. and Berger-by، نويسنده , , G. and Giruzzi، نويسنده , , G. and Gunn، نويسنده , , J. and Hertout، نويسنده , , P. and Rimini، نويسنده , , F. and Saint-Laurent، نويسنده , , F.، نويسنده ,
Abstract :
A prototype of ICRF antenna based on the load-resilient electrical layout anticipated for ITER has been built at CEA-Cadarache. It consists of two toroidally adjacent resonant double loops (RDLs) based on the conjugate-T concept proposed for the ITER ICRF array. This prototype has been recently validated in Tore Supra plasmas exhibiting fast density perturbations in front of the antenna. This paper reports on the load resilience properties of the antenna prototype, as well as the RF modeling and the commissioning. Significant effort on modeling, coupled to an extensive low power campaign, has allowed characterization of the antenna in both vacuum and plasma loading conditions. Plasma load modelings computed with the code TOPICA – very helpful to set up the matching points on plasmas – are found to be in good agreement with the experimental results. The main studies focus on load resilience properties have been carried out in L-mode plasmas. Supersonic molecular beam injection (SMBI), able to launch a series of very short/dense gas jets at Mach number up to 5, was used to mimic the sudden increases of the antenna coupling provoked by ELMs. The results are found to be in good agreement with RF circuit calculations that include 3D modeling.
