Electromagnetic design optimization of the inboard shielding blanket for the volumetric neutron source

This work presents a set of electromagnetic (EM) analyses performed on the Volumetric Neutron Source (VNS), a facility designed to test fusion reactor components under near-reactor conditions. The study investigates eddy currents, Lorentz forces, and halo current distributions in critical components such as the shield blanket, divertor, vacuum vessel, and thermal shield under transient electromagnetic scenarios. Key events such as Vertical Displacement Events (VDEs), analyzed using MAXFEA, and toroidal field coil fast discharges (TFCFDs) are implemented in finite element method models developed in ANSYS to calculate the induced EM loads. Focus is given to the inboard blanket's design, with modifications to reduce EM loads by optimizing electrical contacts, refining material configurations, and incorporating ferromagnetic elements to satisfy the requirements for the attachment system. Results provide essential feedback for structural improvements and advancing the VNS toward operational feasibility. The methodology and findings contribute broadly to fusion reactor design by addressing critical challenges posed by EM transients.