Construction of HSX HSX Assembly HSX fully assembled. HSX Main Coils and Coil Assembly Type-1 HSX magnet coil epoxy impregnated, and mounted into its stainless steel support ring. The extra magnet coil mounted on the support ring is an auxiliary coil for fine-tuning the HSX magnetic field structure. One of the 48 main coils during winding. HSX Magnet Coil Support and Alignment Design of coil support/alignment system (drawing). Coil support structure with rings. HSX Helical Vacuum Vessel Vacuum vessel component.