Session RP1 - Poster Session VIII.
POSTER session, Thursday afternoon, October 30
Fran Hill Southeast Exhibit Hall, ACC
The Ignitor Magnet System is comprised of 24 Toroidal Field Coils (TFC) and 12+2 pairs of Poloidal Field Coils (PFC), including the Central Solenoid and the EM Press. Currents in the TFC and each of the PFC are regulated by dedicated thyristor converter units. Starting from a first possible scenario for the magnet currents and voltages evolution, an iterative optimization process of the total installed electrical power has been performed, by taking into account several elements: smoothing of the current evolution, reduction of the voltage step variations by switching on proper resistors, modifying the coil turns and the coil current consequently, connecting in series coils with similar current behaviour, eliminating coils if poorly effective on the plasma, using converter schemes (sequential control or internal feedback control) suitable to reduce the reactive power requirements and ac current harmonics. In this way the total installed power in the Ignitor Power Supply System is about 2200 MVA instead of about 3400 MVA calculated before the optimization process. In addition the power requirements (max active power, max reactive power, max active power negative/positive steps) result compatible to the 400 kV Grid operational requirements.