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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

A 170 GHz, 2 MW, steady state gyrotron is being developed in a collaboration between European research associations and industries to be used for the electron cyclotron resonance heating (ECRH) system of ITER, the next step in nuclear fusion research. The gyrotron is presently in the prototype state. For the test facility dedicated to the testing of this gyrotron, new power supplies need to be procured. A feasibility study was performed aimed at using new designs based on present day techniques and at performing and constructing a prototype for further testing and evaluation. The prototype BPS (body power supply) which is connected to the body of the gyrotron is now in an advanced stage of construction and the first test results are in close agreement with the design objectives of the feasibility study

In the Frascati Tokamak Upgrade (FTU) machine, there are the following coils: the main transformer coil, the preprogrammed vertical field coil, and the feedback coil. In order to maximize the number of ports for diagnostics apparatus and additional RF heating, FTU has been designed without a massive cupper shell. Plasma displacements due to preprogramming failures or disruptions will be recovered by the vertical field generated by the coil. The plasma current is feedback-controlled by regulating the transformer current. To study the control laws and to optimize the regulation gains, a computer code based on the CSMP III (continuous system modeling program) has been used. >