Hardware of Steady State ICRF Heating for LHD

One of the engineering targets of ion cyclotron range of frequency (ICRF) heating for LHD is to operate in high power (up to 12 MW) and steady state (30 minutes). Research and development of ICRF heating system for steady state operation have been carried out in several years. ICRF system consists of a variety of components such as transmitter, coaxial transmission line, DC break, impedance matching tuner, ceramic feedthrough and antenna. All of these components are designed, fabricated and tested for steady state operation. We concluded that these components were available for steady state experiment in LHD. We have injected the ICRF power into plasma during more than one minute so far.