EM Simulations for the ITER Magnet Cold Test Bench – TF Coil Fast Discharge

While the ITER assembly is progressing, a Magnet Cold Test Bench (MCTB) is also under preparation to test some of the ITER superconducting coils at 4 K up to nominal current before their installation in the pit. In this context transient Electro-Magnetic (EM) calculations were performed to estimate the impact of AC losses and eddy currents on the cryogenic and mechanical performance of the coils and other components of the MCTB. In particular the case of a fast exponential discharge is investigated, which represents the most severe transient operation expected for MCTB. Although different types of ITER coils are considered for the tests (several Toroidal Field Coils and Poloidal Field Coil number 1), the following discussion will be limited to the operation of a single Toroidal Field (TF) coil. Detailed results of the EM analysis, such as field maps, AC losses and QD voltages will be presented.