To properly regulate currents inside IGNITOR poloidal (PFC) and toroidal (TFC) field coils a system of 15 thyristor ac/dc converter has been designed. The total electrical power drawn by the 400 kV Grid has been minimized performing a multi-steps iterative optimization process. In this way the most appropriate current distribution within each PFC has been identified and the coil geometry modified, easing the requirements on the power supplies and on the adopted materials. A specific design has been carried out for each ac/dc converter to minimize the requested reactive power. As a result the total installed power has been reduced from about 3300 MVA down to 2400 MVA.
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