The structure of the power supplies for ITER-FEAT additional heating and current drive systems

Different systems are foreseen for the plasma additional heating and current drive of ITER-FEAT, to provide preionization, assisted current startup, bulk central heating and on- and off-axis current drive. Three different systems of radio frequency (RF) heating (ion cyclotron (IC), electron cyclotron (EC) and lower hybrid (LH)) and a couple of neutral beam injectors (NBI) were designed. The RF generators employ a number of different types of high power vacuum tubes (tetrode (IC), gyrotron (EC) and klystron (LH)) while the neutral injectors consist of coordinated ion production, acceleration and neutralization systems. All these equipments require dedicated dc power supplies PSs; their description and the discussion of their characteristics is done in the paper.