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Abstract

Ion Cyclotron Range of Frequencies (ICRF) waves will be coupled to ITER plasma with arrays of radiating straps. Such arrays are fully characterized by input impedance matrix [Z(ij)], relating RF voltage Vi on strap feeder i to RF current l(j) on feeder j, thus summarizing all antenna coupling properties. Modelling Z precisely has recently become a priority : both experiments with the new Tore Supra (TS) ITER-like antenna and modelling for JET-EP [1] suggest that the new �conjugate-T� matching scheme foreseen for ITER [2] is sensitive to strap cross-talk, i.e. to off-diagonal Z(ij) elements. However no numerical tool is presently able to account accurately both for the geometrical details of the wave launching structure and for the dielectric properties of a realistic plasma. Simulation would be substantially simplified if the plasma could be reduced to a high permittivity dielectric medium, as in [1]. Yet both measurements and modelling in other contexts [3,4] suggest that some information is always lost in such reduction. This paper investigates the impact on the structure of Z of some dielectric properties specific to a plasma, with emphasis on the coupling imbalance between identical straps.

Additional information

Authors: COLAS L, Departement de Recherches sur la Fusion Controlee, Association Euratom-CEA sur la Fusion, CEA Cadarache, Saint-Paul-lez-Durance (FR);BREMOND S, Departement de Recherches sur la Fusion Controlee, Association Euratom-CEA sur la Fusion, CEA Cadarache, Saint-Paul-lez-Durance (FR);BOSIA G, Departement de Recherches sur la Fusion Controlee, Association Euratom-CEA sur la Fusion, CEA Cadarache, Saint-Paul-lez-Durance (FR);HEURAUX S, LPMIA, Unite du CNRS 7040, Universite Henri Poincare, Nancy (FR)
Bibliographic Reference: An oral paper given at: 31st EPS Conference on Controlled Fusion and Plasma Physics Organised by: CCLRC Rutherford Appleton Laboratory (GB); EURATOM/UKAEA Fusion Association (GB) Held at: Imperial College London(GB)
Availability: Available from Association EURATOM-CEA, Departement de Recherches sur la Fusion Controlee, CEA Cadarache, F-13108 St Paul-Lez-Durance, France Tel: (+33) 4 42 25 70 01; Fax: (+33) 4 42 25 64 21 E-mail: dirdrfc@drfc.cad.cea.fr
Record Number: 200417670 / Last updated on: 2004-07-30
Category: PUBLICATION
Original language: en
Available languages: en
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