A new internal matching impedance concept for ICRF antennas

As an alternative to commercial capacitors which have experienced reliability problems and are irrelevant to the next step, a new all-metal impedance concept has been elaborated for Tore Supra ICRF Resonant Double Loop (RDL) antenna. Two detailed design versions are presented, both based on the principle of a parallel LC transformer inserted in a coaxial structure. First low power measurement results on a full-scale mock-up are discussed.