Circuit analysis and control of the power supply system for the testing of ITER TF model coil

The TOSKA test facility of the Forschungszentrum Karlsruhe, which was especially built for testing large superconducting coils, has been upgraded for the test of the ITER Toroidal Field Model Coil (TFMC) in the framework of the ITER-EDA R&D programme. The upgrade includes the extension of the cryogenic supply system, a new 20 kA power supply for the background field generated by the existing LCT Coil as well as two 80 kA current leads and a 80 kA dump circuit for the TFMC. At this stage the power supply systems, including their dump circuits, can be tested only up to 10 kA with a 25 tons Cu coil. Therefore, suitable calculation tools have been developed for circuit analysis, control optimisation and simulation of possible scenarios at full current.