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Inter-Filament Coupling Currents Modelling in Superconducting Filamentary Nb3Sn Strands and Magnets.
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Europe/Zurich
30/6-019 (CERN)
Description
Speaker: Carmelo Barbagallo (TE-MPE-PE)
Title: Inter-filament coupling currents modelling in superconducting filamentary Nb3Sn strands and magnets.
Abstract: Modelling accurately magneto-thermal transient occurring in superconducting magnets is challenging. The behaviour of a magnet is characterized by the combination of several phenomena (electrical, magnetic and thermal) for which numerical simulations are required.
Variation in the local current density in superconducting magnets is responsible for several types of transitory losses. Among those, interfilament coupling losses could play a crucial role on the coil protection against overheating after a quench .
In this presentation we show an overview of the different formulations used to model inter-filament coupling currents (IFCCs) in superconducting strands and magnets. FEM 2-D models were implemented in COMSOL to model interfilament coupling current physics both at cable and magnet level.
The magnetoquasistatic problem was solved by using a modified magnetic vector potential formulation, where the IFCCs are solved in terms of their equivalent magnetization. Simulations were carried-out both in steady and transient conditions allowing to estimate the magnetic field maps, current discharge, quench resistance, electrical resistivity, voltage at magnet terminal, MIITs, peak temperature and IFCCs losses for energy extraction and CLIQ simulations.
